[jira] [Resolved] (HBASE-3484) Replace memstore's ConcurrentSkipListMap with our own implementation

["Andrew Kyle Purtell (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-3484?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Kyle Purtell resolved HBASE-3484.
----------------------------------------
    Resolution: Duplicate

CCSMap work supersedes this.

> 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: WIP_HBASE-3484.patch, hierarchical-map.txt, memstore_drag.png
>
>
> 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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