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https://issues.apache.org/jira/browse/HBASE-21628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16727547#comment-16727547
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stack commented on HBASE-21628:
-------------------------------

Looks good. Want to say in one line how you've changed the behavior here... 
swapping in a new executorservice in place of custom thread launch and why your 
approach? Thanks.

BLOCKER is used in one place only. Why the static define? s/block/blocked/ It 
is to block on?

Please follow the style of the files you are changing (Notice how spaces before 
open of parens?)

Give below a bit of an edit please? We throw DifferentScanThreadException if 
two threads share a prefetcher?

24       * Throw when different thread scan result use same
25       * {@link org.apache.hadoop.hbase.client.ClientAsyncPrefetchScanner}

Thanks.

> memory leak risk when ClientAsyncPrefetchScanner not close
> ----------------------------------------------------------
>
>                 Key: HBASE-21628
>                 URL: https://issues.apache.org/jira/browse/HBASE-21628
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: cong.han
>            Assignee: cong.han
>            Priority: Major
>         Attachments: HBASE-21328-v1.patch, HBASE-21628-v2.patch
>
>
> When we use ClientAsyncPrefetchScanner and we do two things below
> 1 Forgot to call close() method
> 2 The result are not full fetched 
> The prefetch thread will not exit and leave a memory leak risk.
>  



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