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https://issues.apache.org/jira/browse/HBASE-17434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15805638#comment-15805638
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Ted Yu commented on HBASE-17434:
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bq. it does not use any CopyOnWrite data structures
bq. It does not add any synchronization.
Latest patch on HBASE-17379 satisfies the above as well.
bq. It removes the synchronization from getSegments()
This is a corollary of the copy on write semantics.
I incorporated this change in patch v31 for HBASE-17379. So far
TestHRegionWithInMemoryFlush has passed 8 iterations and is still running.
> New Synchronization Scheme for Compaction Pipeline
> --------------------------------------------------
>
> Key: HBASE-17434
> URL: https://issues.apache.org/jira/browse/HBASE-17434
> Project: HBase
> Issue Type: Bug
> Reporter: Eshcar Hillel
> Attachments: HBASE-17434-V01.patch
>
>
> A new copyOnWrite synchronization scheme is introduced for the compaction
> pipeline.
> The new scheme is better since it removes the lock from getSegments() which
> is invoked in every get and scan operation, and it reduces the number of
> LinkedList objects that are created at runtime, thus can reduce GC (not by
> much, but still...).
> In addition, it fixes the method getTailSize() in compaction pipeline. This
> method creates a MemstoreSize object which comprises the data size and the
> overhead size of the segment and needs to be atomic.
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