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Posted to issues@hbase.apache.org by "Joe Pallas (JIRA)" <ji...@apache.org> on 2011/06/10 20:13:59 UTC
[jira] [Commented] (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:comment-tabpanel&focusedCommentId=13047342#comment-13047342 ]
Joe Pallas commented on HBASE-3484:
-----------------------------------
I think the performance issue I mentioned above may actually be HBASE-3855.
> 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
> Fix For: 0.92.0
>
>
> 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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