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https://issues.apache.org/jira/browse/HBASE-14906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15037148#comment-15037148
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Duo Zhang commented on HBASE-14906:
-----------------------------------
{quote}
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
{quote}
Sounds reasonable. What about introduce two configurations here? One is the
lower bound of lower bound, one is the exact lower bound? Make global config
and table config have different meanings is a little confusing I think.
> 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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