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https://issues.apache.org/jira/browse/CASSANDRA-15900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17144408#comment-17144408
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Caleb Rackliffe commented on CASSANDRA-15900:
---------------------------------------------
[~jasonstack] Made a couple comments inline in the PR where I thought that
would be easier. Then there are a few higher level things:
* It might be worthwhile to have a test in {{AsyncStreamingOutputPlusTest}}
that verifies {{AsyncStreamingOutputPlus#writeFileToChannel()}} closes the
provided channel.
* {{AsyncStreamingOutputPlus#writeFileToChannel(FileChannel, StreamRateLimiter,
int)}} and {{AsyncStreamingOutputPlus#writeFileToChannelZeroCopy()}} may be
better off at `private` visibility, given we're treating them as
transport-level implementation details. (Perhaps {{writeFileToChannel}} would
be easier to test at package-private though.)
* The JavaDoc for {{writeFileToChannel(FileChannel, StreamRateLimiter)}} is
slightly out-of date now, given we've lowered the batch size for the SSL case.
(We should make sure to preserve the bit about the method taking ownership of
the {{FileChannel}}.)
> Close channel and reduce buffer allocation during entire sstable streaming
> with SSL
> -----------------------------------------------------------------------------------
>
> Key: CASSANDRA-15900
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15900
> Project: Cassandra
> Issue Type: Bug
> Components: Legacy/Streaming and Messaging
> Reporter: ZhaoYang
> Assignee: ZhaoYang
> Priority: Normal
> Fix For: 4.0-beta
>
>
> CASSANDRA-15740 added the ability to stream entire sstable by loading on-disk
> file into user-space off-heap buffer when SSL is enabled, because netty
> doesn't support zero-copy with SSL.
> But there are two issues:
> # file channel is not closed.
> # 1mb batch size is used. 1mb exceeds buffer pool's max allocation size,
> thus it's all allocated outside the pool and will cause large amount of
> allocations.
> [Patch|https://github.com/apache/cassandra/pull/651]:
> # close file channel when the last batch is loaded into off-heap bytebuffer.
> I don't think we need to wait until buffer is flushed by netty.
> # reduce the batch to 64kb which is more buffer pool friendly when streaming
> entire sstable with SSL.
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