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https://issues.apache.org/jira/browse/HBASE-5311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13204074#comment-13204074
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Raghu Angadi commented on HBASE-5311:
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yeah, theoretically stale values are expected any way. And at higher layer
memstore might allow only one accessor for a key.
> Allow inmemory Memstore compactions
> -----------------------------------
>
> Key: HBASE-5311
> URL: https://issues.apache.org/jira/browse/HBASE-5311
> Project: HBase
> Issue Type: Improvement
> Reporter: Lars Hofhansl
> Attachments: InternallyLayeredMap.java
>
>
> Just like we periodically compact the StoreFiles we should also periodically
> compact the MemStore.
> During these compactions we eliminate deleted cells, expired cells, cells to
> removed because of version count, etc, before we even do a memstore flush.
> Besides the optimization that we could get from this, it should also allow us
> to remove the special handling of ICV, Increment, and Append (all of which
> use upsert logic to avoid accumulating excessive cells in the Memstore).
> Not targeting this.
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