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From "Yu Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14906) Improvements on FlushLargeStoresPolicy
Date Wed, 02 Dec 2015 16:07:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15036035#comment-15036035
] 

Yu Li commented on HBASE-14906:
-------------------------------

Thanks for the quick response [~Apache9]!

About config in table description, I think we need to preserve a way for experts to override
the default value, in case they really need to set a *smaller* value than {{region.getMemstoreFlushSize()
/ familyNumber}} for their use case (setting the global config to a smaller value won't take
effect by current design). Agree?

> Improvements on FlushLargeStoresPolicy
> --------------------------------------
>
>                 Key: HBASE-14906
>                 URL: https://issues.apache.org/jira/browse/HBASE-14906
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 2.0.0
>            Reporter: Yu Li
>            Assignee: Yu Li
>         Attachments: HBASE-14906.patch
>
>
> When checking FlushLargeStoragePolicy, found below possible improving points:
> 1. Currently in selectStoresToFlush, we will do the selection no matter how many actual
families, which is not necessary for one single family
> 2. Default value for hbase.hregion.percolumnfamilyflush.size.lower.bound could not fit
in all cases, and requires user to know details of the implementation to properly set it.
We propose to use "hbase.hregion.memstore.flush.size/column_family_number" instead:
> {noformat}
>   <property>
>     <name>hbase.hregion.percolumnfamilyflush.size.lower.bound</name>
>     <value>16777216</value>
>     <description>
>     If FlushLargeStoresPolicy is used and there are multiple column families,
>     then every time that we hit the total memstore limit, we find out all the
>     column families whose memstores exceed a "lower bound" and only flush them
>     while retaining the others in memory. The "lower bound" will be
>     "hbase.hregion.memstore.flush.size / column_family_number" by default
>     unless value of this property is larger than that. If none of the families
>     have their memstore size more than lower bound, all the memstores will be
>     flushed (just as usual).
>     </description>
>   </property>
> {noformat}



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