21356: Remove all Python 2/3 compatibility imports
[arvados.git] / sdk / python / tests / test_keep_client.py
index 126116393df8ea476f62d959c108e0a0d063bd0a..2dc4363f0c836f0e4fd780d48d3b21e8f350855d 100644 (file)
@@ -2,25 +2,24 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-from __future__ import absolute_import
-from __future__ import division
-from future import standard_library
-standard_library.install_aliases()
-from builtins import str
-from builtins import range
-from builtins import object
 import hashlib
-import mock
 import os
+import errno
 import pycurl
 import random
 import re
 import shutil
 import socket
 import sys
+import stat
+import tempfile
 import time
 import unittest
 import urllib.parse
+import mmap
+
+from unittest import mock
+from unittest.mock import patch
 
 import parameterized
 
@@ -31,22 +30,29 @@ from . import arvados_testutil as tutil
 from . import keepstub
 from . import run_test_server
 
-from .arvados_testutil import make_block_cache
+from .arvados_testutil import DiskCacheBase
 
 @parameterized.parameterized_class([{"disk_cache": True}, {"disk_cache": False}])
-class KeepTestCase(run_test_server.TestCaseWithServers):
+class KeepTestCase(run_test_server.TestCaseWithServers, DiskCacheBase):
     disk_cache = False
     MAIN_SERVER = {}
     KEEP_SERVER = {}
+    block_cache_test = None
 
     @classmethod
     def setUpClass(cls):
         super(KeepTestCase, cls).setUpClass()
         run_test_server.authorize_with("admin")
         cls.api_client = arvados.api('v1')
+        cls.block_cache_test = DiskCacheBase()
         cls.keep_client = arvados.KeepClient(api_client=cls.api_client,
                                              proxy='', local_store='',
-                                             block_cache=make_block_cache(cls.disk_cache))
+                                             block_cache=cls.block_cache_test.make_block_cache(cls.disk_cache))
+
+    @classmethod
+    def tearDownClass(cls):
+        super(KeepTestCase, cls).setUpClass()
+        cls.block_cache_test.tearDown()
 
     def test_KeepBasicRWTest(self):
         self.assertEqual(0, self.keep_client.upload_counter.get())
@@ -137,14 +143,17 @@ class KeepTestCase(run_test_server.TestCaseWithServers):
                          'wrong content from Keep.get for "test_head"')
 
 @parameterized.parameterized_class([{"disk_cache": True}, {"disk_cache": False}])
-class KeepPermissionTestCase(run_test_server.TestCaseWithServers):
+class KeepPermissionTestCase(run_test_server.TestCaseWithServers, DiskCacheBase):
     disk_cache = False
     MAIN_SERVER = {}
     KEEP_SERVER = {'blob_signing': True}
 
+    def tearDown(self):
+        DiskCacheBase.tearDown(self)
+
     def test_KeepBasicRWTest(self):
         run_test_server.authorize_with('active')
-        keep_client = arvados.KeepClient(block_cache=make_block_cache(self.disk_cache))
+        keep_client = arvados.KeepClient(block_cache=self.make_block_cache(self.disk_cache))
         foo_locator = keep_client.put('foo')
         self.assertRegex(
             foo_locator,
@@ -154,35 +163,35 @@ class KeepPermissionTestCase(run_test_server.TestCaseWithServers):
                          b'foo',
                          'wrong content from Keep.get(md5("foo"))')
 
-        # GET with an unsigned locator => NotFound
+        # GET with an unsigned locator => bad request
         bar_locator = keep_client.put('bar')
         unsigned_bar_locator = "37b51d194a7513e45b56f6524f2d51f2+3"
         self.assertRegex(
             bar_locator,
             r'^37b51d194a7513e45b56f6524f2d51f2\+3\+A[a-f0-9]+@[a-f0-9]+$',
             'invalid locator from Keep.put("bar"): ' + bar_locator)
-        self.assertRaises(arvados.errors.NotFoundError,
+        self.assertRaises(arvados.errors.KeepReadError,
                           keep_client.get,
                           unsigned_bar_locator)
 
-        # GET from a different user => NotFound
+        # GET from a different user => bad request
         run_test_server.authorize_with('spectator')
-        self.assertRaises(arvados.errors.NotFoundError,
+        self.assertRaises(arvados.errors.KeepReadError,
                           arvados.Keep.get,
                           bar_locator)
 
-        # Unauthenticated GET for a signed locator => NotFound
-        # Unauthenticated GET for an unsigned locator => NotFound
+        # Unauthenticated GET for a signed locator => bad request
+        # Unauthenticated GET for an unsigned locator => bad request
         keep_client.api_token = ''
-        self.assertRaises(arvados.errors.NotFoundError,
+        self.assertRaises(arvados.errors.KeepReadError,
                           keep_client.get,
                           bar_locator)
-        self.assertRaises(arvados.errors.NotFoundError,
+        self.assertRaises(arvados.errors.KeepReadError,
                           keep_client.get,
                           unsigned_bar_locator)
 
 @parameterized.parameterized_class([{"disk_cache": True}, {"disk_cache": False}])
-class KeepProxyTestCase(run_test_server.TestCaseWithServers):
+class KeepProxyTestCase(run_test_server.TestCaseWithServers, DiskCacheBase):
     disk_cache = False
     MAIN_SERVER = {}
     KEEP_SERVER = {}
@@ -196,12 +205,13 @@ class KeepProxyTestCase(run_test_server.TestCaseWithServers):
 
     def tearDown(self):
         super(KeepProxyTestCase, self).tearDown()
+        DiskCacheBase.tearDown(self)
 
     def test_KeepProxyTest1(self):
         # Will use ARVADOS_KEEP_SERVICES environment variable that
         # is set by setUpClass().
         keep_client = arvados.KeepClient(api_client=self.api_client,
-                                         local_store='', block_cache=make_block_cache(self.disk_cache))
+                                         local_store='', block_cache=self.make_block_cache(self.disk_cache))
         baz_locator = keep_client.put('baz')
         self.assertRegex(
             baz_locator,
@@ -218,7 +228,7 @@ class KeepProxyTestCase(run_test_server.TestCaseWithServers):
         arvados.config.settings()['ARVADOS_KEEP_SERVICES'] = 'http://10.0.0.1 https://foo.example.org:1234/'
         keep_client = arvados.KeepClient(api_client=self.api_client,
                                          local_store='',
-                                         block_cache=make_block_cache(self.disk_cache))
+                                         block_cache=self.make_block_cache(self.disk_cache))
         uris = [x['_service_root'] for x in keep_client._keep_services]
         self.assertEqual(uris, ['http://10.0.0.1/',
                                 'https://foo.example.org:1234/'])
@@ -228,14 +238,17 @@ class KeepProxyTestCase(run_test_server.TestCaseWithServers):
         with self.assertRaises(arvados.errors.ArgumentError):
             keep_client = arvados.KeepClient(api_client=self.api_client,
                                              local_store='',
-                                             block_cache=make_block_cache(self.disk_cache))
+                                             block_cache=self.make_block_cache(self.disk_cache))
 
 @parameterized.parameterized_class([{"disk_cache": True}, {"disk_cache": False}])
-class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
+class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock, DiskCacheBase):
     disk_cache = False
 
+    def tearDown(self):
+        DiskCacheBase.tearDown(self)
+
     def get_service_roots(self, api_client):
-        keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
+        keep_client = arvados.KeepClient(api_client=api_client, block_cache=self.make_block_cache(self.disk_cache))
         services = keep_client.weighted_service_roots(arvados.KeepLocator('0'*32))
         return [urllib.parse.urlparse(url) for url in sorted(services)]
 
@@ -255,11 +268,11 @@ class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
     def test_recognize_proxy_services_in_controller_response(self):
         keep_client = arvados.KeepClient(api_client=self.mock_keep_services(
             service_type='proxy', service_host='localhost', service_port=9, count=1),
-                                         block_cache=make_block_cache(self.disk_cache))
+                                         block_cache=self.make_block_cache(self.disk_cache))
         try:
             # this will fail, but it ensures we get the service
             # discovery response
-            keep_client.put('baz2')
+            keep_client.put('baz2', num_retries=0)
         except:
             pass
         self.assertTrue(keep_client.using_proxy)
@@ -270,7 +283,7 @@ class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
 
         api_client.insecure = True
         with tutil.mock_keep_responses(b'foo', 200) as mock:
-            keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
+            keep_client = arvados.KeepClient(api_client=api_client, block_cache=self.make_block_cache(self.disk_cache))
             keep_client.get('acbd18db4cc2f85cedef654fccc4a4d8+3')
             self.assertEqual(
                 mock.responses[0].getopt(pycurl.SSL_VERIFYPEER),
@@ -281,7 +294,7 @@ class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
 
         api_client.insecure = False
         with tutil.mock_keep_responses(b'foo', 200) as mock:
-            keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
+            keep_client = arvados.KeepClient(api_client=api_client, block_cache=self.make_block_cache(self.disk_cache))
             keep_client.get('acbd18db4cc2f85cedef654fccc4a4d8+3')
             # getopt()==None here means we didn't change the
             # default. If we were using real pycurl instead of a mock,
@@ -302,7 +315,7 @@ class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
         headers = {'X-Keep-Locator':local_loc}
         with tutil.mock_keep_responses('', 200, **headers):
             # Check that the translated locator gets returned
-            keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
+            keep_client = arvados.KeepClient(api_client=api_client, block_cache=self.make_block_cache(self.disk_cache))
             self.assertEqual(local_loc, keep_client.refresh_signature(remote_loc))
             # Check that refresh_signature() uses the correct method and headers
             keep_client._get_or_head = mock.MagicMock()
@@ -321,7 +334,11 @@ class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
         api_client = self.mock_keep_services(count=1)
         force_timeout = socket.timeout("timed out")
         with tutil.mock_keep_responses(force_timeout, 0) as mock:
-            keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
+            keep_client = arvados.KeepClient(
+                api_client=api_client,
+                block_cache=self.make_block_cache(self.disk_cache),
+                num_retries=0,
+            )
             with self.assertRaises(arvados.errors.KeepReadError):
                 keep_client.get('ffffffffffffffffffffffffffffffff')
             self.assertEqual(
@@ -338,7 +355,11 @@ class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
         api_client = self.mock_keep_services(count=1)
         force_timeout = socket.timeout("timed out")
         with tutil.mock_keep_responses(force_timeout, 0) as mock:
-            keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
+            keep_client = arvados.KeepClient(
+                api_client=api_client,
+                block_cache=self.make_block_cache(self.disk_cache),
+                num_retries=0,
+            )
             with self.assertRaises(arvados.errors.KeepWriteError):
                 keep_client.put(b'foo')
             self.assertEqual(
@@ -355,7 +376,11 @@ class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
         api_client = self.mock_keep_services(count=1)
         force_timeout = socket.timeout("timed out")
         with tutil.mock_keep_responses(force_timeout, 0) as mock:
-            keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
+            keep_client = arvados.KeepClient(
+                api_client=api_client,
+                block_cache=self.make_block_cache(self.disk_cache),
+                num_retries=0,
+            )
             with self.assertRaises(arvados.errors.KeepReadError):
                 keep_client.head('ffffffffffffffffffffffffffffffff')
             self.assertEqual(
@@ -372,7 +397,11 @@ class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
         api_client = self.mock_keep_services(service_type='proxy', count=1)
         force_timeout = socket.timeout("timed out")
         with tutil.mock_keep_responses(force_timeout, 0) as mock:
-            keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
+            keep_client = arvados.KeepClient(
+                api_client=api_client,
+                block_cache=self.make_block_cache(self.disk_cache),
+                num_retries=0,
+            )
             with self.assertRaises(arvados.errors.KeepReadError):
                 keep_client.get('ffffffffffffffffffffffffffffffff')
             self.assertEqual(
@@ -389,7 +418,11 @@ class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
         api_client = self.mock_keep_services(service_type='proxy', count=1)
         force_timeout = socket.timeout("timed out")
         with tutil.mock_keep_responses(force_timeout, 0) as mock:
-            keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
+            keep_client = arvados.KeepClient(
+                api_client=api_client,
+                block_cache=self.make_block_cache(self.disk_cache),
+                num_retries=0,
+            )
             with self.assertRaises(arvados.errors.KeepReadError):
                 keep_client.head('ffffffffffffffffffffffffffffffff')
             self.assertEqual(
@@ -403,10 +436,14 @@ class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
                 None)
 
     def test_proxy_put_timeout(self):
+        self.disk_cache_dir = None
         api_client = self.mock_keep_services(service_type='proxy', count=1)
         force_timeout = socket.timeout("timed out")
         with tutil.mock_keep_responses(force_timeout, 0) as mock:
-            keep_client = arvados.KeepClient(api_client=api_client)
+            keep_client = arvados.KeepClient(
+                api_client=api_client,
+                num_retries=0,
+            )
             with self.assertRaises(arvados.errors.KeepWriteError):
                 keep_client.put('foo')
             self.assertEqual(
@@ -423,7 +460,11 @@ class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
         api_client = mock.MagicMock(name='api_client')
         api_client.keep_services().accessible().execute.side_effect = (
             arvados.errors.ApiError)
-        keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
+        keep_client = arvados.KeepClient(
+            api_client=api_client,
+            block_cache=self.make_block_cache(self.disk_cache),
+            num_retries=0,
+        )
         with self.assertRaises(exc_class) as err_check:
             getattr(keep_client, verb)('d41d8cd98f00b204e9800998ecf8427e+0')
         self.assertEqual(0, len(err_check.exception.request_errors()))
@@ -443,7 +484,11 @@ class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
             "retry error reporting test", 500, 500, 500, 500, 500, 500, 502, 502)
         with req_mock, tutil.skip_sleep, \
                 self.assertRaises(exc_class) as err_check:
-            keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
+            keep_client = arvados.KeepClient(
+                api_client=api_client,
+                block_cache=self.make_block_cache(self.disk_cache),
+                num_retries=0,
+            )
             getattr(keep_client, verb)('d41d8cd98f00b204e9800998ecf8427e+0',
                                        num_retries=3)
         self.assertEqual([502, 502], [
@@ -466,7 +511,11 @@ class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
         api_client = self.mock_keep_services(count=3)
         with tutil.mock_keep_responses(data_loc, 200, 500, 500) as req_mock, \
                 self.assertRaises(arvados.errors.KeepWriteError) as exc_check:
-            keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
+            keep_client = arvados.KeepClient(
+                api_client=api_client,
+                block_cache=self.make_block_cache(self.disk_cache),
+                num_retries=0,
+            )
             keep_client.put(data)
         self.assertEqual(2, len(exc_check.exception.request_errors()))
 
@@ -476,8 +525,12 @@ class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
         api_client = self.mock_keep_services(service_type='proxy', read_only=True, count=1)
         with tutil.mock_keep_responses(data_loc, 200, 500, 500) as req_mock, \
                 self.assertRaises(arvados.errors.KeepWriteError) as exc_check:
-          keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
-          keep_client.put(data)
+            keep_client = arvados.KeepClient(
+                api_client=api_client,
+                block_cache=self.make_block_cache(self.disk_cache),
+                num_retries=0,
+            )
+            keep_client.put(data)
         self.assertEqual(True, ("no Keep services available" in str(exc_check.exception)))
         self.assertEqual(0, len(exc_check.exception.request_errors()))
 
@@ -485,7 +538,11 @@ class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
         body = b'oddball service get'
         api_client = self.mock_keep_services(service_type='fancynewblobstore')
         with tutil.mock_keep_responses(body, 200):
-            keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
+            keep_client = arvados.KeepClient(
+                api_client=api_client,
+                block_cache=self.make_block_cache(self.disk_cache),
+                num_retries=0,
+            )
             actual = keep_client.get(tutil.str_keep_locator(body))
         self.assertEqual(body, actual)
 
@@ -494,7 +551,11 @@ class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
         pdh = tutil.str_keep_locator(body)
         api_client = self.mock_keep_services(service_type='fancynewblobstore')
         with tutil.mock_keep_responses(pdh, 200):
-            keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
+            keep_client = arvados.KeepClient(
+                api_client=api_client,
+                block_cache=self.make_block_cache(self.disk_cache),
+                num_retries=0,
+            )
             actual = keep_client.put(body, copies=1)
         self.assertEqual(pdh, actual)
 
@@ -506,22 +567,29 @@ class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
         headers = {'x-keep-replicas-stored': 3}
         with tutil.mock_keep_responses(pdh, 200, 418, 418, 418,
                                        **headers) as req_mock:
-            keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
+            keep_client = arvados.KeepClient(
+                api_client=api_client,
+                block_cache=self.make_block_cache(self.disk_cache),
+                num_retries=0,
+            )
             actual = keep_client.put(body, copies=2)
         self.assertEqual(pdh, actual)
         self.assertEqual(1, req_mock.call_count)
 
 @tutil.skip_sleep
 @parameterized.parameterized_class([{"disk_cache": True}, {"disk_cache": False}])
-class KeepClientCacheTestCase(unittest.TestCase, tutil.ApiClientMock):
+class KeepClientCacheTestCase(unittest.TestCase, tutil.ApiClientMock, DiskCacheBase):
     disk_cache = False
 
     def setUp(self):
         self.api_client = self.mock_keep_services(count=2)
-        self.keep_client = arvados.KeepClient(api_client=self.api_client, block_cache=make_block_cache(self.disk_cache))
+        self.keep_client = arvados.KeepClient(api_client=self.api_client, block_cache=self.make_block_cache(self.disk_cache))
         self.data = b'xyzzy'
         self.locator = '1271ed5ef305aadabc605b1609e24c52'
 
+    def tearDown(self):
+        DiskCacheBase.tearDown(self)
+
     @mock.patch('arvados.KeepClient.KeepService.get')
     def test_get_request_cache(self, get_mock):
         with tutil.mock_keep_responses(self.data, 200, 200):
@@ -550,128 +618,18 @@ class KeepClientCacheTestCase(unittest.TestCase, tutil.ApiClientMock):
         # First reponse was not cached because it was from a HEAD request.
         self.assertNotEqual(head_resp, get_resp)
 
-@tutil.skip_sleep
-@parameterized.parameterized_class([{"disk_cache": True}, {"disk_cache": False}])
-class KeepStorageClassesTestCase(unittest.TestCase, tutil.ApiClientMock):
-    disk_cache = False
 
-    def setUp(self):
-        self.api_client = self.mock_keep_services(count=2)
-        self.keep_client = arvados.KeepClient(api_client=self.api_client, block_cache=make_block_cache(self.disk_cache))
-        self.data = b'xyzzy'
-        self.locator = '1271ed5ef305aadabc605b1609e24c52'
 
-    def test_multiple_default_storage_classes_req_header(self):
-        api_mock = self.api_client_mock()
-        api_mock.config.return_value = {
-            'StorageClasses': {
-                'foo': { 'Default': True },
-                'bar': { 'Default': True },
-                'baz': { 'Default': False }
-            }
-        }
-        api_client = self.mock_keep_services(api_mock=api_mock, count=2)
-        keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
-        resp_hdr = {
-            'x-keep-storage-classes-confirmed': 'foo=1, bar=1',
-            'x-keep-replicas-stored': 1
-        }
-        with tutil.mock_keep_responses(self.locator, 200, **resp_hdr) as mock:
-            keep_client.put(self.data, copies=1)
-            req_hdr = mock.responses[0]
-            self.assertIn(
-                'X-Keep-Storage-Classes: bar, foo', req_hdr.getopt(pycurl.HTTPHEADER))
-
-    def test_storage_classes_req_header(self):
-        self.assertEqual(
-            self.api_client.config()['StorageClasses'],
-            {'default': {'Default': True}})
-        cases = [
-            # requested, expected
-            [['foo'], 'X-Keep-Storage-Classes: foo'],
-            [['bar', 'foo'], 'X-Keep-Storage-Classes: bar, foo'],
-            [[], 'X-Keep-Storage-Classes: default'],
-            [None, 'X-Keep-Storage-Classes: default'],
-        ]
-        for req_classes, expected_header in cases:
-            headers = {'x-keep-replicas-stored': 1}
-            if req_classes is None or len(req_classes) == 0:
-                confirmed_hdr = 'default=1'
-            elif len(req_classes) > 0:
-                confirmed_hdr = ', '.join(["{}=1".format(cls) for cls in req_classes])
-            headers.update({'x-keep-storage-classes-confirmed': confirmed_hdr})
-            with tutil.mock_keep_responses(self.locator, 200, **headers) as mock:
-                self.keep_client.put(self.data, copies=1, classes=req_classes)
-                req_hdr = mock.responses[0]
-                self.assertIn(expected_header, req_hdr.getopt(pycurl.HTTPHEADER))
-
-    def test_partial_storage_classes_put(self):
-        headers = {
-            'x-keep-replicas-stored': 1,
-            'x-keep-storage-classes-confirmed': 'foo=1'}
-        with tutil.mock_keep_responses(self.locator, 200, 503, **headers) as mock:
-            with self.assertRaises(arvados.errors.KeepWriteError):
-                self.keep_client.put(self.data, copies=1, classes=['foo', 'bar'])
-            # 1st request, both classes pending
-            req1_headers = mock.responses[0].getopt(pycurl.HTTPHEADER)
-            self.assertIn('X-Keep-Storage-Classes: bar, foo', req1_headers)
-            # 2nd try, 'foo' class already satisfied
-            req2_headers = mock.responses[1].getopt(pycurl.HTTPHEADER)
-            self.assertIn('X-Keep-Storage-Classes: bar', req2_headers)
-
-    def test_successful_storage_classes_put_requests(self):
-        cases = [
-            # wanted_copies, wanted_classes, confirmed_copies, confirmed_classes, expected_requests
-            [ 1, ['foo'], 1, 'foo=1', 1],
-            [ 1, ['foo'], 2, 'foo=2', 1],
-            [ 2, ['foo'], 2, 'foo=2', 1],
-            [ 2, ['foo'], 1, 'foo=1', 2],
-            [ 1, ['foo', 'bar'], 1, 'foo=1, bar=1', 1],
-            [ 1, ['foo', 'bar'], 2, 'foo=2, bar=2', 1],
-            [ 2, ['foo', 'bar'], 2, 'foo=2, bar=2', 1],
-            [ 2, ['foo', 'bar'], 1, 'foo=1, bar=1', 2],
-            [ 1, ['foo', 'bar'], 1, None, 1],
-            [ 1, ['foo'], 1, None, 1],
-            [ 2, ['foo'], 2, None, 1],
-            [ 2, ['foo'], 1, None, 2],
-        ]
-        for w_copies, w_classes, c_copies, c_classes, e_reqs in cases:
-            headers = {'x-keep-replicas-stored': c_copies}
-            if c_classes is not None:
-                headers.update({'x-keep-storage-classes-confirmed': c_classes})
-            with tutil.mock_keep_responses(self.locator, 200, 200, **headers) as mock:
-                case_desc = 'wanted_copies={}, wanted_classes="{}", confirmed_copies={}, confirmed_classes="{}", expected_requests={}'.format(w_copies, ', '.join(w_classes), c_copies, c_classes, e_reqs)
-                self.assertEqual(self.locator,
-                    self.keep_client.put(self.data, copies=w_copies, classes=w_classes),
-                    case_desc)
-                self.assertEqual(e_reqs, mock.call_count, case_desc)
-
-    def test_failed_storage_classes_put_requests(self):
-        cases = [
-            # wanted_copies, wanted_classes, confirmed_copies, confirmed_classes, return_code
-            [ 1, ['foo'], 1, 'bar=1', 200],
-            [ 1, ['foo'], 1, None, 503],
-            [ 2, ['foo'], 1, 'bar=1, foo=0', 200],
-            [ 3, ['foo'], 1, 'bar=1, foo=1', 200],
-            [ 3, ['foo', 'bar'], 1, 'bar=2, foo=1', 200],
-        ]
-        for w_copies, w_classes, c_copies, c_classes, return_code in cases:
-            headers = {'x-keep-replicas-stored': c_copies}
-            if c_classes is not None:
-                headers.update({'x-keep-storage-classes-confirmed': c_classes})
-            with tutil.mock_keep_responses(self.locator, return_code, return_code, **headers):
-                case_desc = 'wanted_copies={}, wanted_classes="{}", confirmed_copies={}, confirmed_classes="{}"'.format(w_copies, ', '.join(w_classes), c_copies, c_classes)
-                with self.assertRaises(arvados.errors.KeepWriteError, msg=case_desc):
-                    self.keep_client.put(self.data, copies=w_copies, classes=w_classes)
+
 
 @tutil.skip_sleep
 @parameterized.parameterized_class([{"disk_cache": True}, {"disk_cache": False}])
-class KeepXRequestIdTestCase(unittest.TestCase, tutil.ApiClientMock):
+class KeepXRequestIdTestCase(unittest.TestCase, tutil.ApiClientMock, DiskCacheBase):
     disk_cache = False
 
     def setUp(self):
         self.api_client = self.mock_keep_services(count=2)
-        self.keep_client = arvados.KeepClient(api_client=self.api_client, block_cache=make_block_cache(self.disk_cache))
+        self.keep_client = arvados.KeepClient(api_client=self.api_client, block_cache=self.make_block_cache(self.disk_cache))
         self.data = b'xyzzy'
         self.locator = '1271ed5ef305aadabc605b1609e24c52'
         self.test_id = arvados.util.new_request_id()
@@ -681,6 +639,9 @@ class KeepXRequestIdTestCase(unittest.TestCase, tutil.ApiClientMock):
         # id='123456789'>:
         self.api_client.request_id = None
 
+    def tearDown(self):
+        DiskCacheBase.tearDown(self)
+
     def test_default_to_api_client_request_id(self):
         self.api_client.request_id = self.test_id
         with tutil.mock_keep_responses(self.locator, 200, 200) as mock:
@@ -757,7 +718,7 @@ class KeepXRequestIdTestCase(unittest.TestCase, tutil.ApiClientMock):
 
 @tutil.skip_sleep
 #@parameterized.parameterized_class([{"disk_cache": True}, {"disk_cache": False}])
-class KeepClientRendezvousTestCase(unittest.TestCase, tutil.ApiClientMock):
+class KeepClientRendezvousTestCase(unittest.TestCase, tutil.ApiClientMock, DiskCacheBase):
     disk_cache = False
 
     def setUp(self):
@@ -781,7 +742,10 @@ class KeepClientRendezvousTestCase(unittest.TestCase, tutil.ApiClientMock):
             hashlib.md5(self.blocks[x]).hexdigest()
             for x in range(len(self.expected_order))]
         self.api_client = self.mock_keep_services(count=self.services)
-        self.keep_client = arvados.KeepClient(api_client=self.api_client, block_cache=make_block_cache(self.disk_cache))
+        self.keep_client = arvados.KeepClient(api_client=self.api_client, block_cache=self.make_block_cache(self.disk_cache))
+
+    def tearDown(self):
+        DiskCacheBase.tearDown(self)
 
     def test_weighted_service_roots_against_reference_set(self):
         # Confirm weighted_service_roots() returns the correct order
@@ -854,12 +818,12 @@ class KeepClientRendezvousTestCase(unittest.TestCase, tutil.ApiClientMock):
             hashlib.md5("{:064x}".format(x).encode()).hexdigest() for x in range(100)]
         initial_services = 12
         self.api_client = self.mock_keep_services(count=initial_services)
-        self.keep_client = arvados.KeepClient(api_client=self.api_client, block_cache=make_block_cache(self.disk_cache))
+        self.keep_client = arvados.KeepClient(api_client=self.api_client, block_cache=self.make_block_cache(self.disk_cache))
         probes_before = [
             self.keep_client.weighted_service_roots(arvados.KeepLocator(hash)) for hash in hashes]
         for added_services in range(1, 12):
             api_client = self.mock_keep_services(count=initial_services+added_services)
-            keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
+            keep_client = arvados.KeepClient(api_client=api_client, block_cache=self.make_block_cache(self.disk_cache))
             total_penalty = 0
             for hash_index in range(len(hashes)):
                 probe_after = keep_client.weighted_service_roots(
@@ -895,7 +859,7 @@ class KeepClientRendezvousTestCase(unittest.TestCase, tutil.ApiClientMock):
         # Arbitrary port number:
         aport = random.randint(1024,65535)
         api_client = self.mock_keep_services(service_port=aport, count=self.services)
-        keep_client = arvados.KeepClient(api_client=api_client, block_cache=make_block_cache(self.disk_cache))
+        keep_client = arvados.KeepClient(api_client=api_client, block_cache=self.make_block_cache(self.disk_cache))
         with mock.patch('pycurl.Curl') as curl_mock, \
              self.assertRaises(exc_class) as err_check:
             curl_mock.return_value = tutil.FakeCurl.make(code=500, body=b'')
@@ -912,7 +876,7 @@ class KeepClientRendezvousTestCase(unittest.TestCase, tutil.ApiClientMock):
         self.check_64_zeros_error_order('put', arvados.errors.KeepWriteError)
 
 @parameterized.parameterized_class([{"disk_cache": True}, {"disk_cache": False}])
-class KeepClientTimeout(keepstub.StubKeepServers, unittest.TestCase):
+class KeepClientTimeout(keepstub.StubKeepServers, unittest.TestCase, DiskCacheBase):
     disk_cache = False
 
     # BANDWIDTH_LOW_LIM must be less than len(DATA) so we can transfer
@@ -922,6 +886,9 @@ class KeepClientTimeout(keepstub.StubKeepServers, unittest.TestCase):
     BANDWIDTH_LOW_LIM = 1024
     TIMEOUT_TIME = 1.0
 
+    def tearDown(self):
+        DiskCacheBase.tearDown(self)
+
     class assertTakesBetween(unittest.TestCase):
         def __init__(self, tmin, tmax):
             self.tmin = tmin
@@ -951,7 +918,7 @@ class KeepClientTimeout(keepstub.StubKeepServers, unittest.TestCase):
     def keepClient(self, timeouts=(0.1, TIMEOUT_TIME, BANDWIDTH_LOW_LIM)):
         return arvados.KeepClient(
             api_client=self.api_client,
-            timeout=timeouts, block_cache=make_block_cache(self.disk_cache))
+            timeout=timeouts, block_cache=self.make_block_cache(self.disk_cache))
 
     def test_timeout_slow_connect(self):
         # Can't simulate TCP delays with our own socket. Leave our
@@ -1056,9 +1023,12 @@ class KeepClientTimeout(keepstub.StubKeepServers, unittest.TestCase):
                 kc.put(self.DATA, copies=1, num_retries=0)
 
 @parameterized.parameterized_class([{"disk_cache": True}, {"disk_cache": False}])
-class KeepClientGatewayTestCase(unittest.TestCase, tutil.ApiClientMock):
+class KeepClientGatewayTestCase(unittest.TestCase, tutil.ApiClientMock, DiskCacheBase):
     disk_cache = False
 
+    def tearDown(self):
+        DiskCacheBase.tearDown(self)
+
     def mock_disks_and_gateways(self, disks=3, gateways=1):
         self.gateways = [{
                 'uuid': 'zzzzz-bi6l4-gateway{:08d}'.format(i),
@@ -1073,7 +1043,7 @@ class KeepClientGatewayTestCase(unittest.TestCase, tutil.ApiClientMock):
             for gw in self.gateways]
         self.api_client = self.mock_keep_services(
             count=disks, additional_services=self.gateways)
-        self.keepClient = arvados.KeepClient(api_client=self.api_client, block_cache=make_block_cache(self.disk_cache))
+        self.keepClient = arvados.KeepClient(api_client=self.api_client, block_cache=self.make_block_cache(self.disk_cache))
 
     @mock.patch('pycurl.Curl')
     def test_get_with_gateway_hint_first(self, MockCurl):
@@ -1181,7 +1151,7 @@ class KeepClientRetryTestMixin(object):
     def new_client(self, **caller_kwargs):
         kwargs = self.client_kwargs.copy()
         kwargs.update(caller_kwargs)
-        kwargs['block_cache'] = make_block_cache(self.disk_cache)
+        kwargs['block_cache'] = self.make_block_cache(self.disk_cache)
         return arvados.KeepClient(**kwargs)
 
     def run_method(self, *args, **kwargs):
@@ -1211,10 +1181,6 @@ class KeepClientRetryTestMixin(object):
         with self.TEST_PATCHER(self.DEFAULT_EXPECT, Exception('mock err'), 200):
             self.check_success(num_retries=3)
 
-    def test_no_default_retry(self):
-        with self.TEST_PATCHER(self.DEFAULT_EXPECT, 500, 200):
-            self.check_exception()
-
     def test_no_retry_after_permanent_error(self):
         with self.TEST_PATCHER(self.DEFAULT_EXPECT, 403, 200):
             self.check_exception(num_retries=3)
@@ -1232,12 +1198,15 @@ class KeepClientRetryTestMixin(object):
 
 @tutil.skip_sleep
 @parameterized.parameterized_class([{"disk_cache": True}, {"disk_cache": False}])
-class KeepClientRetryGetTestCase(KeepClientRetryTestMixin, unittest.TestCase):
+class KeepClientRetryGetTestCase(KeepClientRetryTestMixin, unittest.TestCase, DiskCacheBase):
     DEFAULT_EXPECT = KeepClientRetryTestMixin.TEST_DATA
     DEFAULT_EXCEPTION = arvados.errors.KeepReadError
     HINTED_LOCATOR = KeepClientRetryTestMixin.TEST_LOCATOR + '+K@xyzzy'
     TEST_PATCHER = staticmethod(tutil.mock_keep_responses)
 
+    def tearDown(self):
+        DiskCacheBase.tearDown(self)
+
     def run_method(self, locator=KeepClientRetryTestMixin.TEST_LOCATOR,
                    *args, **kwargs):
         return self.new_client().get(locator, *args, **kwargs)
@@ -1251,7 +1220,7 @@ class KeepClientRetryGetTestCase(KeepClientRetryTestMixin, unittest.TestCase):
         # and a high threshold of servers report that it's not found.
         # This test rigs up 50/50 disagreement between two servers, and
         # checks that it does not become a NotFoundError.
-        client = self.new_client()
+        client = self.new_client(num_retries=0)
         with tutil.mock_keep_responses(self.DEFAULT_EXPECT, 404, 500):
             with self.assertRaises(arvados.errors.KeepReadError) as exc_check:
                 client.get(self.HINTED_LOCATOR)
@@ -1277,12 +1246,15 @@ class KeepClientRetryGetTestCase(KeepClientRetryTestMixin, unittest.TestCase):
 
 @tutil.skip_sleep
 @parameterized.parameterized_class([{"disk_cache": True}, {"disk_cache": False}])
-class KeepClientRetryHeadTestCase(KeepClientRetryTestMixin, unittest.TestCase):
+class KeepClientRetryHeadTestCase(KeepClientRetryTestMixin, unittest.TestCase, DiskCacheBase):
     DEFAULT_EXPECT = True
     DEFAULT_EXCEPTION = arvados.errors.KeepReadError
     HINTED_LOCATOR = KeepClientRetryTestMixin.TEST_LOCATOR + '+K@xyzzy'
     TEST_PATCHER = staticmethod(tutil.mock_keep_responses)
 
+    def tearDown(self):
+        DiskCacheBase.tearDown(self)
+
     def run_method(self, locator=KeepClientRetryTestMixin.TEST_LOCATOR,
                    *args, **kwargs):
         return self.new_client().head(locator, *args, **kwargs)
@@ -1296,7 +1268,7 @@ class KeepClientRetryHeadTestCase(KeepClientRetryTestMixin, unittest.TestCase):
         # and a high threshold of servers report that it's not found.
         # This test rigs up 50/50 disagreement between two servers, and
         # checks that it does not become a NotFoundError.
-        client = self.new_client()
+        client = self.new_client(num_retries=0)
         with tutil.mock_keep_responses(self.DEFAULT_EXPECT, 404, 500):
             with self.assertRaises(arvados.errors.KeepReadError) as exc_check:
                 client.head(self.HINTED_LOCATOR)
@@ -1316,11 +1288,14 @@ class KeepClientRetryHeadTestCase(KeepClientRetryTestMixin, unittest.TestCase):
 
 @tutil.skip_sleep
 @parameterized.parameterized_class([{"disk_cache": True}, {"disk_cache": False}])
-class KeepClientRetryPutTestCase(KeepClientRetryTestMixin, unittest.TestCase):
+class KeepClientRetryPutTestCase(KeepClientRetryTestMixin, unittest.TestCase, DiskCacheBase):
     DEFAULT_EXPECT = KeepClientRetryTestMixin.TEST_LOCATOR
     DEFAULT_EXCEPTION = arvados.errors.KeepWriteError
     TEST_PATCHER = staticmethod(tutil.mock_keep_responses)
 
+    def tearDown(self):
+        DiskCacheBase.tearDown(self)
+
     def run_method(self, data=KeepClientRetryTestMixin.TEST_DATA,
                    copies=1, *args, **kwargs):
         return self.new_client().put(data, copies, *args, **kwargs)
@@ -1405,7 +1380,7 @@ class AvoidOverreplication(unittest.TestCase, tutil.ApiClientMock):
 
 @tutil.skip_sleep
 @parameterized.parameterized_class([{"disk_cache": True}, {"disk_cache": False}])
-class RetryNeedsMultipleServices(unittest.TestCase, tutil.ApiClientMock):
+class RetryNeedsMultipleServices(unittest.TestCase, tutil.ApiClientMock, DiskCacheBase):
     block_cache = False
 
     # Test put()s that need two distinct servers to succeed, possibly
@@ -1413,7 +1388,10 @@ class RetryNeedsMultipleServices(unittest.TestCase, tutil.ApiClientMock):
 
     def setUp(self):
         self.api_client = self.mock_keep_services(count=2)
-        self.keep_client = arvados.KeepClient(api_client=self.api_client, block_cache=make_block_cache(self.disk_cache))
+        self.keep_client = arvados.KeepClient(api_client=self.api_client, block_cache=self.make_block_cache(self.disk_cache))
+
+    def tearDown(self):
+        DiskCacheBase.tearDown(self)
 
     def test_success_after_exception(self):
         with tutil.mock_keep_responses(
@@ -1441,9 +1419,12 @@ class RetryNeedsMultipleServices(unittest.TestCase, tutil.ApiClientMock):
         self.assertEqual(2, req_mock.call_count)
 
 @parameterized.parameterized_class([{"disk_cache": True}, {"disk_cache": False}])
-class KeepClientAPIErrorTest(unittest.TestCase):
+class KeepClientAPIErrorTest(unittest.TestCase, DiskCacheBase):
     disk_cache = False
 
+    def tearDown(self):
+        DiskCacheBase.tearDown(self)
+
     def test_api_fail(self):
         class ApiMock(object):
             def __getattr__(self, r):
@@ -1457,7 +1438,7 @@ class KeepClientAPIErrorTest(unittest.TestCase):
                     raise arvados.errors.KeepReadError()
         keep_client = arvados.KeepClient(api_client=ApiMock(),
                                          proxy='', local_store='',
-                                         block_cache=make_block_cache(self.disk_cache))
+                                         block_cache=self.make_block_cache(self.disk_cache))
 
         # The bug this is testing for is that if an API (not
         # keepstore) exception is thrown as part of a get(), the next
@@ -1471,3 +1452,252 @@ class KeepClientAPIErrorTest(unittest.TestCase):
             keep_client.get("acbd18db4cc2f85cedef654fccc4a4d8+3")
         with self.assertRaises(arvados.errors.KeepReadError):
             keep_client.get("acbd18db4cc2f85cedef654fccc4a4d8+3")
+
+
+class KeepDiskCacheTestCase(unittest.TestCase, tutil.ApiClientMock):
+    def setUp(self):
+        self.api_client = self.mock_keep_services(count=2)
+        self.data = b'xyzzy'
+        self.locator = '1271ed5ef305aadabc605b1609e24c52'
+        self.disk_cache_dir = tempfile.mkdtemp()
+
+    def tearDown(self):
+        shutil.rmtree(self.disk_cache_dir)
+
+
+    @mock.patch('arvados.KeepClient.KeepService.get')
+    def test_disk_cache_read(self, get_mock):
+        # confirm it finds an existing cache block when the cache is
+        # initialized.
+
+        os.makedirs(os.path.join(self.disk_cache_dir, self.locator[0:3]))
+        with open(os.path.join(self.disk_cache_dir, self.locator[0:3], self.locator+".keepcacheblock"), "wb") as f:
+            f.write(self.data)
+
+        # block cache should have found the existing block
+        block_cache = arvados.keep.KeepBlockCache(disk_cache=True,
+                                                  disk_cache_dir=self.disk_cache_dir)
+        keep_client = arvados.KeepClient(api_client=self.api_client, block_cache=block_cache)
+
+        self.assertTrue(tutil.binary_compare(keep_client.get(self.locator), self.data))
+
+        get_mock.assert_not_called()
+
+
+    @mock.patch('arvados.KeepClient.KeepService.get')
+    def test_disk_cache_share(self, get_mock):
+        # confirm it finds a cache block written after the disk cache
+        # was initialized.
+
+        block_cache = arvados.keep.KeepBlockCache(disk_cache=True,
+                                                  disk_cache_dir=self.disk_cache_dir)
+        keep_client = arvados.KeepClient(api_client=self.api_client, block_cache=block_cache)
+
+        os.makedirs(os.path.join(self.disk_cache_dir, self.locator[0:3]))
+        with open(os.path.join(self.disk_cache_dir, self.locator[0:3], self.locator+".keepcacheblock"), "wb") as f:
+            f.write(self.data)
+
+        # when we try to get the block, it'll check the disk and find it.
+        self.assertTrue(tutil.binary_compare(keep_client.get(self.locator), self.data))
+
+        get_mock.assert_not_called()
+
+
+    def test_disk_cache_write(self):
+        # confirm the cache block was created
+
+        block_cache = arvados.keep.KeepBlockCache(disk_cache=True,
+                                                  disk_cache_dir=self.disk_cache_dir)
+        keep_client = arvados.KeepClient(api_client=self.api_client, block_cache=block_cache)
+
+        with tutil.mock_keep_responses(self.data, 200) as mock:
+            self.assertTrue(tutil.binary_compare(keep_client.get(self.locator), self.data))
+
+        self.assertIsNotNone(keep_client.get_from_cache(self.locator))
+
+        with open(os.path.join(self.disk_cache_dir, self.locator[0:3], self.locator+".keepcacheblock"), "rb") as f:
+            self.assertTrue(tutil.binary_compare(f.read(), self.data))
+
+
+    def test_disk_cache_clean(self):
+        # confirm that a tmp file in the cache is cleaned up
+
+        os.makedirs(os.path.join(self.disk_cache_dir, self.locator[0:3]))
+        with open(os.path.join(self.disk_cache_dir, self.locator[0:3], "tmpXYZABC.keepcacheblock"), "wb") as f:
+            f.write(b"abc1")
+
+        with open(os.path.join(self.disk_cache_dir, self.locator[0:3], "tmpXYZABC"), "wb") as f:
+            f.write(b"abc2")
+
+        with open(os.path.join(self.disk_cache_dir, self.locator[0:3], "XYZABC"), "wb") as f:
+            f.write(b"abc3")
+
+        self.assertTrue(os.path.exists(os.path.join(self.disk_cache_dir, self.locator[0:3], "tmpXYZABC.keepcacheblock")))
+        self.assertTrue(os.path.exists(os.path.join(self.disk_cache_dir, self.locator[0:3], "tmpXYZABC")))
+        self.assertTrue(os.path.exists(os.path.join(self.disk_cache_dir, self.locator[0:3], "XYZABC")))
+
+        block_cache = arvados.keep.KeepBlockCache(disk_cache=True,
+                                                  disk_cache_dir=self.disk_cache_dir)
+
+        # The tmp still hasn't been deleted because it was created in the last 60 seconds
+        self.assertTrue(os.path.exists(os.path.join(self.disk_cache_dir, self.locator[0:3], "tmpXYZABC.keepcacheblock")))
+        self.assertTrue(os.path.exists(os.path.join(self.disk_cache_dir, self.locator[0:3], "tmpXYZABC")))
+        self.assertTrue(os.path.exists(os.path.join(self.disk_cache_dir, self.locator[0:3], "XYZABC")))
+
+        # Set the mtime to 61s in the past
+        os.utime(os.path.join(self.disk_cache_dir, self.locator[0:3], "tmpXYZABC.keepcacheblock"), times=(time.time()-61, time.time()-61))
+        os.utime(os.path.join(self.disk_cache_dir, self.locator[0:3], "tmpXYZABC"), times=(time.time()-61, time.time()-61))
+        os.utime(os.path.join(self.disk_cache_dir, self.locator[0:3], "XYZABC"), times=(time.time()-61, time.time()-61))
+
+        block_cache2 = arvados.keep.KeepBlockCache(disk_cache=True,
+                                                   disk_cache_dir=self.disk_cache_dir)
+
+        # Tmp should be gone but the other ones are safe.
+        self.assertFalse(os.path.exists(os.path.join(self.disk_cache_dir, self.locator[0:3], "tmpXYZABC.keepcacheblock")))
+        self.assertTrue(os.path.exists(os.path.join(self.disk_cache_dir, self.locator[0:3], "tmpXYZABC")))
+        self.assertTrue(os.path.exists(os.path.join(self.disk_cache_dir, self.locator[0:3], "XYZABC")))
+
+
+    @mock.patch('arvados.KeepClient.KeepService.get')
+    def test_disk_cache_cap(self, get_mock):
+        # confirm that the cache is kept to the desired limit
+
+        os.makedirs(os.path.join(self.disk_cache_dir, self.locator[0:3]))
+        with open(os.path.join(self.disk_cache_dir, self.locator[0:3], self.locator+".keepcacheblock"), "wb") as f:
+            f.write(self.data)
+
+        os.makedirs(os.path.join(self.disk_cache_dir, "acb"))
+        with open(os.path.join(self.disk_cache_dir, "acb", "acbd18db4cc2f85cedef654fccc4a4d8.keepcacheblock"), "wb") as f:
+            f.write(b"foo")
+
+        self.assertTrue(os.path.exists(os.path.join(self.disk_cache_dir, self.locator[0:3], self.locator+".keepcacheblock")))
+        self.assertTrue(os.path.exists(os.path.join(self.disk_cache_dir, "acb", "acbd18db4cc2f85cedef654fccc4a4d8.keepcacheblock")))
+
+        block_cache = arvados.keep.KeepBlockCache(disk_cache=True,
+                                                   disk_cache_dir=self.disk_cache_dir,
+                                                   max_slots=1)
+
+        self.assertFalse(os.path.exists(os.path.join(self.disk_cache_dir, self.locator[0:3], self.locator+".keepcacheblock")))
+        self.assertTrue(os.path.exists(os.path.join(self.disk_cache_dir, "acb", "acbd18db4cc2f85cedef654fccc4a4d8.keepcacheblock")))
+
+
+    @mock.patch('arvados.KeepClient.KeepService.get')
+    def test_disk_cache_share(self, get_mock):
+        # confirm that a second cache doesn't delete files that belong to the first cache.
+
+        os.makedirs(os.path.join(self.disk_cache_dir, self.locator[0:3]))
+        with open(os.path.join(self.disk_cache_dir, self.locator[0:3], self.locator+".keepcacheblock"), "wb") as f:
+            f.write(self.data)
+
+        os.makedirs(os.path.join(self.disk_cache_dir, "acb"))
+        with open(os.path.join(self.disk_cache_dir, "acb", "acbd18db4cc2f85cedef654fccc4a4d8.keepcacheblock"), "wb") as f:
+            f.write(b"foo")
+
+        self.assertTrue(os.path.exists(os.path.join(self.disk_cache_dir, self.locator[0:3], self.locator+".keepcacheblock")))
+        self.assertTrue(os.path.exists(os.path.join(self.disk_cache_dir, "acb", "acbd18db4cc2f85cedef654fccc4a4d8.keepcacheblock")))
+
+        block_cache = arvados.keep.KeepBlockCache(disk_cache=True,
+                                                   disk_cache_dir=self.disk_cache_dir,
+                                                   max_slots=2)
+
+        self.assertTrue(os.path.exists(os.path.join(self.disk_cache_dir, self.locator[0:3], self.locator+".keepcacheblock")))
+        self.assertTrue(os.path.exists(os.path.join(self.disk_cache_dir, "acb", "acbd18db4cc2f85cedef654fccc4a4d8.keepcacheblock")))
+
+        block_cache2 = arvados.keep.KeepBlockCache(disk_cache=True,
+                                                   disk_cache_dir=self.disk_cache_dir,
+                                                   max_slots=1)
+
+        self.assertTrue(os.path.exists(os.path.join(self.disk_cache_dir, self.locator[0:3], self.locator+".keepcacheblock")))
+        self.assertTrue(os.path.exists(os.path.join(self.disk_cache_dir, "acb", "acbd18db4cc2f85cedef654fccc4a4d8.keepcacheblock")))
+
+
+
+    def test_disk_cache_error(self):
+        os.chmod(self.disk_cache_dir, stat.S_IRUSR)
+
+        # Fail during cache initialization.
+        with self.assertRaises(OSError):
+            block_cache = arvados.keep.KeepBlockCache(disk_cache=True,
+                                                      disk_cache_dir=self.disk_cache_dir)
+
+
+    def test_disk_cache_write_error(self):
+        block_cache = arvados.keep.KeepBlockCache(disk_cache=True,
+                                                  disk_cache_dir=self.disk_cache_dir)
+
+        keep_client = arvados.KeepClient(api_client=self.api_client, block_cache=block_cache)
+
+        # Make the cache dir read-only
+        os.makedirs(os.path.join(self.disk_cache_dir, self.locator[0:3]))
+        os.chmod(os.path.join(self.disk_cache_dir, self.locator[0:3]), stat.S_IRUSR)
+
+        # Cache fails
+        with self.assertRaises(arvados.errors.KeepCacheError):
+            with tutil.mock_keep_responses(self.data, 200) as mock:
+                keep_client.get(self.locator)
+
+
+    def test_disk_cache_retry_write_error(self):
+        block_cache = arvados.keep.KeepBlockCache(disk_cache=True,
+                                                  disk_cache_dir=self.disk_cache_dir)
+
+        keep_client = arvados.KeepClient(api_client=self.api_client, block_cache=block_cache)
+
+        called = False
+        realmmap = mmap.mmap
+        def sideeffect_mmap(*args, **kwargs):
+            nonlocal called
+            if not called:
+                called = True
+                raise OSError(errno.ENOSPC, "no space")
+            else:
+                return realmmap(*args, **kwargs)
+
+        with patch('mmap.mmap') as mockmmap:
+            mockmmap.side_effect = sideeffect_mmap
+
+            cache_max_before = block_cache.cache_max
+
+            with tutil.mock_keep_responses(self.data, 200) as mock:
+                self.assertTrue(tutil.binary_compare(keep_client.get(self.locator), self.data))
+
+            self.assertIsNotNone(keep_client.get_from_cache(self.locator))
+
+        with open(os.path.join(self.disk_cache_dir, self.locator[0:3], self.locator+".keepcacheblock"), "rb") as f:
+            self.assertTrue(tutil.binary_compare(f.read(), self.data))
+
+        # shrank the cache in response to ENOSPC
+        self.assertTrue(cache_max_before > block_cache.cache_max)
+
+
+    def test_disk_cache_retry_write_error2(self):
+        block_cache = arvados.keep.KeepBlockCache(disk_cache=True,
+                                                  disk_cache_dir=self.disk_cache_dir)
+
+        keep_client = arvados.KeepClient(api_client=self.api_client, block_cache=block_cache)
+
+        called = False
+        realmmap = mmap.mmap
+        def sideeffect_mmap(*args, **kwargs):
+            nonlocal called
+            if not called:
+                called = True
+                raise OSError(errno.ENOMEM, "no memory")
+            else:
+                return realmmap(*args, **kwargs)
+
+        with patch('mmap.mmap') as mockmmap:
+            mockmmap.side_effect = sideeffect_mmap
+
+            slots_before = block_cache._max_slots
+
+            with tutil.mock_keep_responses(self.data, 200) as mock:
+                self.assertTrue(tutil.binary_compare(keep_client.get(self.locator), self.data))
+
+            self.assertIsNotNone(keep_client.get_from_cache(self.locator))
+
+        with open(os.path.join(self.disk_cache_dir, self.locator[0:3], self.locator+".keepcacheblock"), "rb") as f:
+            self.assertTrue(tutil.binary_compare(f.read(), self.data))
+
+        # shrank the cache in response to ENOMEM
+        self.assertTrue(slots_before > block_cache._max_slots)