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https://issues.apache.org/jira/browse/HBASE-938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12640901#action_12640901
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Rong-En Fan commented on HBASE-938:
-----------------------------------

In a ~400 regions cluster, I see 140 major compaction within 40 mins after I 
started the cluster, and this is still on-going. 

> major compaction period is not checked periodically
> ---------------------------------------------------
>
>                 Key: HBASE-938
>                 URL: https://issues.apache.org/jira/browse/HBASE-938
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.18.0, 0.18.1
>         Environment: HBase 0.18 branch (should be RC1) + Hadoop 0.18 branch
>            Reporter: Rong-En Fan
>            Priority: Minor
>
> The major compaction period, hbase.hregion.majorcompaction, is not checked 
> periodically. Currently, we only request major compaction when the region is 
> open or split at which point we check whether the major compaction period is 
> due.

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