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Posted to issues@hbase.apache.org by "Liyin Tang (Commented) (JIRA)" <ji...@apache.org> on 2011/10/03 23:23:34 UTC
[jira] [Commented] (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:comment-tabpanel&focusedCommentId=13119629#comment-13119629 ]
Liyin Tang commented on HBASE-4241:
-----------------------------------
Hi Lars, Thanks for your patch. I am trying to back port this feature for hbase-89
I have a quick question:)
why we use CollectionBackedScanner but not reuse memstore scanner?
Thanks a lot
> 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-v8.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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