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From "Liyin Tang (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4241) Optimize flushing of the Store cache for max versions and (new) min versions
Date Mon, 03 Oct 2011 21:23:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13119629#comment-13119629
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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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