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https://issues.apache.org/jira/browse/HBASE-10205?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arjen Roodselaar updated HBASE-10205:
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Description: 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.
(was: 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 'bucketList'. At the same time another WriterThread might call
BucketAllocator.allocateBlock(), which may call BucketSizeInfo.allocate() and
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.)
> ConcurrentModificationException in BucketAllocator
> --------------------------------------------------
>
> Key: HBASE-10205
> URL: https://issues.apache.org/jira/browse/HBASE-10205
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.89-fb
> Reporter: Arjen Roodselaar
> Assignee: Arjen Roodselaar
> Priority: Minor
> Fix For: 0.89-fb
>
>
> 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.
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