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https://issues.apache.org/jira/browse/HBASE-1577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12723884#action_12723884
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stack commented on HBASE-1577:
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ICV is not only user. Anything what would overwrite a version that is in
memcache at same coordinates will run into this issue.
Yeah, we could end up using more memory if a good portion of the memstore has
overwrites. We need to keep up our HeapSize math.
> Move memcache to ConcurrentSkipListMap from ConcurrentSkipListSet
> -----------------------------------------------------------------
>
> Key: HBASE-1577
> URL: https://issues.apache.org/jira/browse/HBASE-1577
> Project: Hadoop HBase
> Issue Type: Improvement
> Reporter: stack
> Assignee: stack
> Fix For: 0.20.0
>
> Attachments: 1577-v2.patch, set2map.patch
>
>
> The CSLM will replace old entry with a new when you put. The CSLS will NOT
> replace if existent key making for a test, and if present, remove semantic
> which to be safe needs synchronizing (Replacement is a Ryan Rawson
> suggestion).
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