[jira] [Assigned] (HBASE-4241) Optimize flushing of the Store cache for max versions and (new) min versions

["Lars Hofhansl (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-4241?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars Hofhansl reassigned HBASE-4241:
------------------------------------

    Assignee: Lars Hofhansl

> 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: Sub-task
>          Components: regionserver
>    Affects Versions: 0.92.0
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>         Attachments: 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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