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https://issues.apache.org/jira/browse/HBASE-24436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17117435#comment-17117435
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Anoop Sam John commented on HBASE-24436:
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Just moving the discussion from PR comments to here.

If I understand the jira correctly, what you are trying to solve is below case.
One region with say 2 stores. Store1 having much more files than other. Say the 
config for the #threads in open pool is 10. Now it will create 2 pools for each 
store with 5 threads each. The Store2 will get finished soon. But store1 will 
take much longer. So if it was a shared pool of 10 threads the overall time for 
opening both stores would have been lesser. my understanding correct?

> The store file open and close thread pool should be shared at the region level
> ------------------------------------------------------------------------------
>
>                 Key: HBASE-24436
>                 URL: https://issues.apache.org/jira/browse/HBASE-24436
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Junhong Xu
>            Assignee: Junhong Xu
>            Priority: Minor
>
> For now, we provide threads per column family evenly in general, but  there 
> are some cases that some column families have much more store files than 
> others( maybe that's the life, right? ). So in that case, some Stores have 
> beed done quickly while others are struggling.We should share the thread pool 
> at the region level in case of data skew.



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