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T Jake Luciani commented on CASSANDRA-9766:
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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.
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
> Bootstrap outgoing streaming speeds are much slower than during repair
> ----------------------------------------------------------------------
>
> Key: CASSANDRA-9766
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9766
> Project: Cassandra
> Issue Type: Bug
> Components: Streaming and Messaging
> Environment: Cassandra 2.1.2. more details in the pdf attached
> Reporter: Alexei K
> Assignee: T Jake Luciani
> Labels: performance
> Fix For: 2.1.x
>
> Attachments: problem.pdf
>
>
> I have a cluster in Amazon cloud , its described in detail in the attachment.
> What I've noticed is that we during bootstrap we never go above 12MB/sec
> transmission speeds and also those speeds flat line almost like we're hitting
> some sort of a limit ( this remains true for other tests that I've ran)
> however during the repair we see much higher,variable sending rates. I've
> provided network charts in the attachment as well . Is there an explanation
> for this? Is something wrong with my configuration, or is it a possible bug?
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