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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2011/06/11 00:25:58 UTC

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

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

stack updated HBASE-3484:
-------------------------

    Fix Version/s:     (was: 0.92.0)

Moving out of 0.92.  Don't see it happening in time.

> 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
>            Assignee: Todd Lipcon
>            Priority: Critical
>
> 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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