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https://issues.apache.org/jira/browse/HBASE-6651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13459257#comment-13459257
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Hiroshi Ikeda commented on HBASE-6651:
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@stack I can only propose some ideas because I don't have an environment to
build and test HBase, and I hope you create true codes.
> 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: sample.zip, sample.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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