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Date: Tue, 10 Jul 2012 20:22:35 +0000 (UTC)
From: "Jean-Daniel Cryans (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-3484) Replace memstore's
 ConcurrentSkipListMap with our own implementation
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    [ https://issues.apache.org/jira/browse/HBASE-3484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13410818#comment-13410818 ] 

Jean-Daniel Cryans commented on HBASE-3484:
-------------------------------------------

Something that's not log(n), so a straight line would be ideal :)
                
> 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
>
>
> 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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