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https://issues.apache.org/jira/browse/HBASE-15514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15205758#comment-15205758
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ramkrishna.s.vasudevan commented on HBASE-15514:
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Better to convert all these as subtasks.
So familyMap has to do a clone() every time. That is generating lot of garbage.
But I don't think we can avoid that copy if a Map with byte[] is used.
> Single (or small number) of Column Family(ies) in Mutation optimization
> -----------------------------------------------------------------------
>
> Key: HBASE-15514
> URL: https://issues.apache.org/jira/browse/HBASE-15514
> Project: HBase
> Issue Type: Improvement
> Components: Performance
> Reporter: Vladimir Rodionov
> Assignee: Vladimir Rodionov
>
> familyMap in Mutation class is TreeMap<byte[], List<Cell>>. Overhead of
> TreeMap - 48 bytes, TreeMap$Entry - 40 bytes.
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