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From "Stephen Yuan Jiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15691) Port HBASE-10205 (ConcurrentModificationException in BucketAllocator) to branch-1
Date Wed, 21 Jun 2017 00:13:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16056708#comment-16056708

Stephen Yuan Jiang commented on HBASE-15691:

[~zjushch], you reviewed the original patch in HBASE-10205.  Could you help review the V2

> Port HBASE-10205 (ConcurrentModificationException in BucketAllocator) to branch-1
> ---------------------------------------------------------------------------------
>                 Key: HBASE-15691
>                 URL: https://issues.apache.org/jira/browse/HBASE-15691
>             Project: HBase
>          Issue Type: Sub-task
>    Affects Versions: 1.3.0
>            Reporter: Andrew Purtell
>            Assignee: Stephen Yuan Jiang
>             Fix For: 1.3.2, 1.4.1, 1.5.0, 1.2.7
>         Attachments: HBASE-15691-branch-1.patch, HBASE-15691.v2-branch-1.patch
> HBASE-10205 solves the following problem:
> "
> The BucketCache WriterThread calls BucketCache.freeSpace() upon draining the RAM queue
containing entries to be cached. freeSpace() in turn calls BucketSizeInfo.statistics() through
BucketAllocator.getIndexStatistics(), which iterates over 'bucketList'. At the same time another
WriterThread might call BucketAllocator.allocateBlock(), which may call BucketSizeInfo.allocateBlock(),
add a bucket to 'bucketList' and consequently cause a ConcurrentModificationException. Calls
to BucketAllocator.allocateBlock() are synchronized, but calls to BucketAllocator.getIndexStatistics()
are not, which allows this race to occur.
> "
> However, for some unknown reason, HBASE-10205 was only committed to master (2.0 and beyond)
and 0.98 branches only. To preserve continuity we should commit it to branch-1.

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