X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/5794ce4f00cd583eee74719118516c0c993fca1c..d87717b4ec885059183ef6d7fa6780c343338455:/sdk/python/arvados/collection.py

diff --git a/sdk/python/arvados/collection.py b/sdk/python/arvados/collection.py
index d530f58b03..7bfdf782f8 100644
--- a/sdk/python/arvados/collection.py
+++ b/sdk/python/arvados/collection.py
@@ -304,7 +304,7 @@ class _WriterFile(ArvadosFileBase):
 class CollectionWriter(CollectionBase):
     KEEP_BLOCK_SIZE = 2**26
 
-    def __init__(self, api_client=None, num_retries=0):
+    def __init__(self, api_client=None, num_retries=0, replication=None):
         """Instantiate a CollectionWriter.
 
         CollectionWriter lets you build a new Arvados Collection from scratch.
@@ -320,9 +320,13 @@ class CollectionWriter(CollectionBase):
           service requests.  Default 0.  You may change this value
           after instantiation, but note those changes may not
           propagate to related objects like the Keep client.
+        * replication: The number of copies of each block to store.
+          If this argument is None or not supplied, replication is
+          the server-provided default if available, otherwise 2.
         """
         self._api_client = api_client
         self.num_retries = num_retries
+        self.replication = (2 if replication is None else replication)
         self._keep_client = None
         self._data_buffer = []
         self._data_buffer_len = 0
@@ -477,7 +481,9 @@ class CollectionWriter(CollectionBase):
         data_buffer = ''.join(self._data_buffer)
         if data_buffer:
             self._current_stream_locators.append(
-                self._my_keep().put(data_buffer[0:self.KEEP_BLOCK_SIZE]))
+                self._my_keep().put(
+                    data_buffer[0:self.KEEP_BLOCK_SIZE],
+                    copies=self.replication))
             self._data_buffer = [data_buffer[self.KEEP_BLOCK_SIZE:]]
             self._data_buffer_len = len(self._data_buffer[0])
 
@@ -552,8 +558,16 @@ class CollectionWriter(CollectionBase):
         self._current_file_name = None
 
     def finish(self):
-        # Store the manifest in Keep and return its locator.
-        return self._my_keep().put(self.manifest_text())
+        """Store the manifest in Keep and return its locator.
+
+        This is useful for storing manifest fragments (task outputs)
+        temporarily in Keep during a Crunch job.
+
+        In other cases you should make a collection instead, by
+        sending manifest_text() to the API server's "create
+        collection" endpoint.
+        """
+        return self._my_keep().put(self.manifest_text(), copies=self.replication)
 
     def portable_data_hash(self):
         stripped = self.stripped_manifest()
@@ -587,10 +601,9 @@ class ResumableCollectionWriter(CollectionWriter):
                    '_data_buffer', '_dependencies', '_finished_streams',
                    '_queued_dirents', '_queued_trees']
 
-    def __init__(self, api_client=None, num_retries=0):
+    def __init__(self, api_client=None, **kwargs):
         self._dependencies = {}
-        super(ResumableCollectionWriter, self).__init__(
-            api_client, num_retries=num_retries)
+        super(ResumableCollectionWriter, self).__init__(api_client, **kwargs)
 
     @classmethod
     def from_state(cls, state, *init_args, **init_kwargs):