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https://issues.apache.org/jira/browse/CASSANDRA-4338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13401848#comment-13401848
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Jonathan Ellis commented on CASSANDRA-4338:
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I'd vote for:
- test with LCS, with/without compression (maybe even reduce sstable size to
1MB to really stress sstable creation)
- enable gc logging, count promotion failures so we have quantitative data (if
we see zero both ways, we may need a more complex test)
- if instead we see nonzero promotion failures both ways, at about the same
rate, we might need to look at using our "cleaner" hack to free the direct
buffers, or use a buffer based on FreeableMemory, to avoid the phantomreference
crap that DirectBuffer normally inflicts on GC
> Experiment with direct buffer in SequentialWriter
> -------------------------------------------------
>
> Key: CASSANDRA-4338
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4338
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Yuki Morishita
> Priority: Minor
> Fix For: 1.2
>
> Attachments: gc-4338-patched.png, gc-trunk.png
>
>
> Using a direct buffer instead of a heap-based byte[] should let us avoid a
> copy into native memory when we flush the buffer.
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