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https://issues.apache.org/jira/browse/HBASE-13678?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Purtell resolved HBASE-13678.
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Resolution: Invalid
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> Hbase client block on region call back
> --------------------------------------
>
> Key: HBASE-13678
> URL: https://issues.apache.org/jira/browse/HBASE-13678
> Project: HBase
> Issue Type: Bug
> Components: Client
> Affects Versions: 0.94.15
> Environment: CentOS 6.4 scala 2.11/java 1.7
> Reporter: Junheng Gong
> Labels: easyfix, performance
>
> When batch get some data from cluster, the client will block some threads
> base on region server amount
> In code client use Future.get block a thread for each related region servers
> and wait them finish one by one.
> In our case we have 12 region servers, so most of time the client will cost
> 12 threads for a batch get, if we have many concurrent request it will OOM by
> can not create native threads.
> I suggest we use some kind async or call back to process region server's
> response.
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