[jira] [Commented] (HBASE-16755) Honor flush policy under global memstore pressure

["Enis Soztutar (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-16755?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15890881#comment-15890881 ] 

Enis Soztutar commented on HBASE-16755:
---------------------------------------

bq. We pass true to make sure that we flush something out. So if we can make sure that we can flush something out when we pass false here, I think the patch is OK.
Indeed. when memstore is full, it is a force flush so we have to make sure that no matter what we are flushing something. Does the patch ensure that it happens?  

> Honor flush policy under global memstore pressure
> -------------------------------------------------
>
>                 Key: HBASE-16755
>                 URL: https://issues.apache.org/jira/browse/HBASE-16755
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Ashu Pachauri
>            Assignee: Ashu Pachauri
>             Fix For: 1.3.1
>
>         Attachments: HBASE-16755.v0.patch
>
>
> When global memstore reaches the low water mark, we pick the best flushable region and flush all column families for it. This is a suboptimal approach in the  sense that it leads to an unnecessarily high file creation rate and IO amplification due to compactions. We should still try to honor the underlying FlushPolicy.



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