13108: Fix tracking tasks in flight

[arvados.git] / sdk / cwl / arvados_cwl / fsaccess.py

diff --git a/sdk/cwl/arvados_cwl/fsaccess.py b/sdk/cwl/arvados_cwl/fsaccess.py
index 5bdd8dd085719b88d7d1173e2f03b5c24083c0cf..0b577b06a2e324dbea743244da955f2661a52bea 100644 (file)
--- a/sdk/cwl/arvados_cwl/fsaccess.py
+++ b/sdk/cwl/arvados_cwl/fsaccess.py
@@ -9,6 +9,7 @@ import urlparse
 import re
 import logging
 import threading
+from collections import OrderedDict
 
 import ruamel.yaml as yaml
 
@@ -26,19 +27,46 @@ from schema_salad.ref_resolver import DefaultFetcher
 logger = logging.getLogger('arvados.cwl-runner')
 
 class CollectionCache(object):
-    def __init__(self, api_client, keep_client, num_retries):
+    def __init__(self, api_client, keep_client, num_retries,
+                 cap=256*1024*1024,
+                 min_entries=2):
         self.api_client = api_client
         self.keep_client = keep_client
-        self.collections = {}
+        self.num_retries = num_retries
+        self.collections = OrderedDict()
         self.lock = threading.Lock()
+        self.total = 0
+        self.cap = cap
+        self.min_entries = min_entries
+
+    def cap_cache(self):
+        if self.total > self.cap:
+            # ordered list iterates from oldest to newest
+            for pdh, v in self.collections.items():
+                if self.total < self.cap or len(self.collections) < self.min_entries:
+                    break
+                # cut it loose
+                logger.debug("Evicting collection reader %s from cache", pdh)
+                del self.collections[pdh]
+                self.total -= v[1]
 
     def get(self, pdh):
         with self.lock:
             if pdh not in self.collections:
                 logger.debug("Creating collection reader for %s", pdh)
-                self.collections[pdh] = arvados.collection.CollectionReader(pdh, api_client=self.api_client,
-                                                                            keep_client=self.keep_client)
-            return self.collections[pdh]
+                cr = arvados.collection.CollectionReader(pdh, api_client=self.api_client,
+                                                         keep_client=self.keep_client,
+                                                         num_retries=self.num_retries)
+                sz = len(cr.manifest_text()) * 128
+                self.collections[pdh] = (cr, sz)
+                self.total += sz
+                self.cap_cache()
+            else:
+                cr, sz = self.collections[pdh]
+                # bump it to the back
+                del self.collections[pdh]
+                self.collections[pdh] = (cr, sz)
+            return cr
 
 
 class CollectionFsAccess(cwltool.stdfsaccess.StdFsAccess):
@@ -84,7 +112,7 @@ class CollectionFsAccess(cwltool.stdfsaccess.StdFsAccess):
         if collection is not None and not rest:
             return [pattern]
         patternsegments = rest.split("/")
-        return self._match(collection, patternsegments, "keep:" + collection.manifest_locator())
+        return sorted(self._match(collection, patternsegments, "keep:" + collection.manifest_locator()))
 
     def open(self, fn, mode):
         collection, rest = self.get_collection(fn)
@@ -153,16 +181,13 @@ class CollectionFsAccess(cwltool.stdfsaccess.StdFsAccess):
             return os.path.realpath(path)
 
 class CollectionFetcher(DefaultFetcher):
-    def __init__(self, cache, session, api_client=None, fs_access=None, num_retries=4, overrides=None):
+    def __init__(self, cache, session, api_client=None, fs_access=None, num_retries=4):
         super(CollectionFetcher, self).__init__(cache, session)
         self.api_client = api_client
         self.fsaccess = fs_access
         self.num_retries = num_retries
-        self.overrides = overrides if overrides else {}
 
     def fetch_text(self, url):
-        if url in self.overrides:
-            return self.overrides[url]
         if url.startswith("keep:"):
             with self.fsaccess.open(url, "r") as f:
                 return f.read()
@@ -173,8 +198,6 @@ class CollectionFetcher(DefaultFetcher):
         return super(CollectionFetcher, self).fetch_text(url)
 
     def check_exists(self, url):
-        if url in self.overrides:
-            return True
         try:
             if url.startswith("http://arvados.org/cwl"):
                 return True