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https://issues.apache.org/jira/browse/HBASE-6651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13478071#comment-13478071
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Ted Yu commented on HBASE-6651:
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bq. SharedMap.returnObject() returns false if the pool is already full, or
invalidateObject() or clear() method has been called explicitly in other place.
Can you explain why calling clear() followed by returnObject() would result in
return value of false ? There is space in SharedMap at this moment, right ?
I will put my other comments on the reviewboard.
Hadoop QA is running your patch:
https://builds.apache.org/job/PreCommit-HBASE-Build/3065/parameters/
> Thread safety of HTablePool is doubtful
> ---------------------------------------
>
> Key: HBASE-6651
> URL: https://issues.apache.org/jira/browse/HBASE-6651
> Project: HBase
> Issue Type: Bug
> Components: Client
> Affects Versions: 0.94.1
> Reporter: Hiroshi Ikeda
> Priority: Minor
> Attachments: HBASE-6651.patch, HBASE-6651-V2.patch, sample.zip,
> sample.zip, sharedmap_for_hbaseclient.zip
>
>
> There are some operations in HTablePool to access to PoolMap in multiple
> times without any explict synchronization.
> For example HTablePool.closeTablePool() calles PoolMap.values(), and calles
> PoolMap.remove(). If other threads add new instances to the pool in the
> middle of the calls, the new added instances might be dropped.
> (HTablePool.closeTablePool() also has another problem that calling it by
> multple threads causes accessing HTable by multiple threads.)
> Moreover, PoolMap is not thread safe for the same reason.
> For example PoolMap.put() calles ConcurrentMap.get() and calles
> ConcurrentMap.put(). If other threads add a new instance to the concurent map
> in the middle of the calls, the new instance might be dropped.
> And also implementations of Pool have the same problems.
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