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https://issues.apache.org/jira/browse/HBASE-27892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17729018#comment-17729018
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Viraj Jasani commented on HBASE-27892:
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FYI [~jingyu]
> Report memstore on-heap and off-heap size as jmx metrics
> --------------------------------------------------------
>
> Key: HBASE-27892
> URL: https://issues.apache.org/jira/browse/HBASE-27892
> Project: HBase
> Issue Type: Improvement
> Reporter: Bryan Beaudreault
> Priority: Major
>
> Currently we only report "memStoreSize" metric in sub=RegionServer bean. I've
> noticed a big discrepancy between this metric and the RS UI's "Memstore
> On-Heap Size". It seems like "memStoreSize" is the overall data size, while
> the on-heap size is coming from our heap estimation which includes POJO heap
> overhead, etc.
> I have a regionserver with only 750mb of "memStoreSize", but the on-heap size
> is over 1gb. This is non-trivial for estimating overall heap size necessary
> for a regionserver. Since we have the data, let's report it.
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