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https://issues.apache.org/jira/browse/HBASE-3484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13760178#comment-13760178
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Anoop Sam John commented on HBASE-3484:
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In current patch the max size of the memstore slice is specified in terms of
heap size. But what matters is the #entries in the CSLM. I am thinking this can
be #entries in the slice.
> Replace memstore's ConcurrentSkipListMap with our own implementation
> --------------------------------------------------------------------
>
> Key: HBASE-3484
> URL: https://issues.apache.org/jira/browse/HBASE-3484
> Project: HBase
> Issue Type: Improvement
> Components: Performance
> Affects Versions: 0.92.0
> Reporter: Todd Lipcon
> Priority: Critical
> Attachments: hierarchical-map.txt, memstore_drag.png,
> WIP_HBASE-3484.patch
>
>
> By copy-pasting ConcurrentSkipListMap into HBase we can make two improvements
> to it for our use case in MemStore:
> - add an iterator.replace() method which should allow us to do upsert much
> more cheaply
> - implement a Set directly without having to do Map<KeyValue,KeyValue> to
> save one reference per entry
> It turns out CSLM is in public domain from its development as part of JSR
> 166, so we should be OK with licenses.
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