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https://issues.apache.org/jira/browse/HBASE-14567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14951477#comment-14951477
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Jingcheng Du commented on HBASE-14567:
--------------------------------------

I tried to see the cost in each case. In most of cases we have data 
preparation, running target method and assert phases, most of time are used by 
data preparation ( In running target method phase of all cases, it takes less 
than 2 seconds) . for instance, we have the case to compact a restored snapshot 
where the data preparation takes very long time.
I will see the cases again, and try to reduce the time cost in data preparation.

> Tuneup hanging test TestMobCompactor and TestMobSweeper
> -------------------------------------------------------
>
>                 Key: HBASE-14567
>                 URL: https://issues.apache.org/jira/browse/HBASE-14567
>             Project: HBase
>          Issue Type: Sub-task
>          Components: test
>            Reporter: stack
>            Assignee: Jingcheng Du
>         Attachments: 14567v2.txt, HBASE-14567.patch
>
>
> These tests hang with some regularity. Please take a look 
> [[email protected]] since I believe they are yours. If not, let me know 
> and i'll assign elsewhere. Otherwise, I'll just disable them. Thanks.
> They hung here most recently:
>  https://builds.apache.org/job/PreCommit-HBASE-Build/15893//console



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