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https://issues.apache.org/jira/browse/HBASE-4224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13179217#comment-13179217
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Jean-Daniel Cryans commented on HBASE-4224:
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There's already a jira opened for the async flushes and friends, HBASE-4198.

Sync flush in my experience is useless. On a big enough table it takes hours to 
run and by the time it's done data might have been inserted already and other 
flushes might have run. Plus, compactions are still async.
                
> Need a flush by regionserver rather than by table option
> --------------------------------------------------------
>
>                 Key: HBASE-4224
>                 URL: https://issues.apache.org/jira/browse/HBASE-4224
>             Project: HBase
>          Issue Type: Bug
>          Components: shell
>            Reporter: stack
>            Assignee: Akash Ashok
>         Attachments: HBase-4224-v2.patch, HBase-4224.patch
>
>
> This evening needed to clean out logs on the cluster.  logs are by 
> regionserver.  to let go of logs, we need to have all edits emptied from 
> memory.  only flush is by table or region.  We need to be able to flush the 
> regionserver.  Need to add this.

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