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https://issues.apache.org/jira/browse/CASSANDRA-11561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15239320#comment-15239320
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T Jake Luciani commented on CASSANDRA-11561:
--------------------------------------------
Branch is https://github.com/tjake/cassandra/tree/faster-streaming
3.5 test:
Finished Streaming in 25 seconds: 18.92 Mb/sec
branch test:
Finished Streaming in 19 seconds: 25.04 Mb/sec
> Improve Streaming Performance
> -----------------------------
>
> Key: CASSANDRA-11561
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11561
> Project: Cassandra
> Issue Type: Bug
> Components: Streaming and Messaging
> Reporter: T Jake Luciani
> Assignee: T Jake Luciani
> Fix For: 3.x
>
>
> Inspired by CASSANDRA-9766 I've taken a look at the streaming path and have
> been able to improve Streaming performance 25% with the following:
> * CompressedStreamReader had only implemented reading a single byte at a
> time. I added the read(byte[], int, int) method.
> * When writing to sstable, rather than calculate size of row, write the size
> then write the row (which causes 2x the cpu). Serialize the row to memory
> then write size of memory buffer and copy buffer to disk.
> * Added object recycling of the largest garbage sources. Namely,
> BTreeSearchIterator, and DataOutputBuffer (for above fix). There are still a
> few more places recycling would help/ like the Object[] in BTree.Builder
> * Changed all ThreadLocals to use FastThreadLocal from netty, and
> subsequently adding FastThreadLocalThreads for all internal threads.
> There are still more things todo here, like we generate tons of garbage
> boxing types for StreamingHistogram.
> I've added a long test to stream and compact a large sstable.
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