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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6508) [0.89-fb] Filter out edits at log split time
Date Fri, 19 Oct 2012 20:02:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13480330#comment-13480330
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Sergey Shelukhin commented on HBASE-6508:
-----------------------------------------

Hi. Any interest/objections with regard to porting this to 0.94?
                
> [0.89-fb] Filter out edits at log split time
> --------------------------------------------
>
>                 Key: HBASE-6508
>                 URL: https://issues.apache.org/jira/browse/HBASE-6508
>             Project: HBase
>          Issue Type: Improvement
>          Components: master, regionserver, wal
>    Affects Versions: 0.89-fb
>            Reporter: Alex Feinberg
>            Assignee: Alex Feinberg
>             Fix For: 0.89-fb
>
>
> At log splitting time, we can filter out many edits if we have a conservative estimate
of what was saved last in each region.
> This patch does the following:
> 1) When a region server flushes a MemStore to HFile, store the last flushed sequence
id for the region in a map.
> 2) Send the map to master it as a part of the region server report.
> 3) Adds an RPC call in HMasterRegionInterface to allow a region server to query the last
last flushed sequence id for a region.
> 4) Skips any log entry with sequence id lower than last flushed sequence id for the region
during log split time.
> 5) When a region is removed from a region server, removed the the entry for that region
from the map, so that it isn't sent during the next report.
> This can reduce downtime when a regionserver goes down quite a bit.

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