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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2011/08/25 18:37:31 UTC
[jira] [Resolved] (HBASE-4241) Optimize flushing of the Store cache
for max versions and (new) min versions
[ https://issues.apache.org/jira/browse/HBASE-4241?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
stack resolved HBASE-4241.
--------------------------
Resolution: Fixed
Fix Version/s: 0.92.0
Hadoop Flags: [Reviewed]
Committed to TRUNK. Thanks for the patch Lars. Nice reviewing Ted.
> Optimize flushing of the Store cache for max versions and (new) min versions
> ----------------------------------------------------------------------------
>
> Key: HBASE-4241
> URL: https://issues.apache.org/jira/browse/HBASE-4241
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Affects Versions: 0.92.0
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Fix For: 0.92.0
>
> Attachments: 4241-v2.txt, 4241.txt
>
>
> As discussed with with Jon, there is room for improvement in how the memstore is flushed to disk.
> Currently only expired KVs are pruned before flushing, but we can also prune versions if we find at least maxVersions versions in the memstore.
> The same holds for the new minversion feature: If we find at least minVersion versions in the store we can remove all further versions that are expired.
> Generally we should use the same mechanism here that is used for Compaction. I.e. StoreScanner. We only need to add a scanner to Memstore that can scan along the current snapshot.
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