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https://issues.apache.org/jira/browse/HBASE-17434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15805502#comment-15805502
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Eshcar Hillel commented on HBASE-17434:
---------------------------------------
The problem reported in HBASE-17379 can be fixed only in the context of
HBASE-17081 since the bug does not exists in trunk.
This issue fixes another bug that exists in trunk.
It also implements the synchronization scheme that was discussed in
HBASE-17379. It is an improvement of the existing scheme.
I will address all review comment in the coming days.
CompactionPipeline doesn't have a getScanners() method in trunk.
> 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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