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https://issues.apache.org/jira/browse/CASSANDRA-14556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16543739#comment-16543739
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ASF GitHub Bot commented on CASSANDRA-14556:
--------------------------------------------
Github user dineshjoshi commented on a diff in the pull request:
https://github.com/apache/cassandra/pull/239#discussion_r202477311
--- Diff: src/java/org/apache/cassandra/db/DiskBoundaries.java ---
@@ -129,4 +129,19 @@ public int
getBoundariesFromSSTableDirectory(Descriptor descriptor)
{
return directories.get(getDiskIndex(sstable));
}
+
+ public Directories.DataDirectory getCorrectDiskForKey(DecoratedKey key)
+ {
+ if (positions == null)
+ return null;
+
+ return directories.get(getDiskIndex(key));
+ }
+
+ private int getDiskIndex(DecoratedKey key)
+ {
+ int pos = Collections.binarySearch(positions, key);
--- End diff --
This method is pretty much a replica of `getDiskIndex(SSTableReader
sstable)` (See:
https://github.com/dineshjoshi/cassandra/blob/657ce3670a5291decf2939d72d51abe19333ef15/src/java/org/apache/cassandra/db/DiskBoundaries.java#L102)
Instead of accepting a sstable, I pass in a `DecoratedKey`.
We ensure that the range is owned at the upper levels of the stack.
> Optimize streaming path in Cassandra
> ------------------------------------
>
> Key: CASSANDRA-14556
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14556
> Project: Cassandra
> Issue Type: Improvement
> Components: Streaming and Messaging
> Reporter: Dinesh Joshi
> Assignee: Dinesh Joshi
> Priority: Major
> Labels: Performance
> Fix For: 4.x
>
>
> During streaming, Cassandra reifies the sstables into objects. This creates
> unnecessary garbage and slows down the whole streaming process as some
> sstables can be transferred as a whole file rather than individual
> partitions. The objective of the ticket is to detect when a whole sstable can
> be transferred and skip the object reification. We can also use a zero-copy
> path to avoid bringing data into user-space on both sending and receiving
> side.
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