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From "Heng Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14949) Skip duplicate entries when replay WAL.
Date Wed, 30 Dec 2015 06:37:49 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15074683#comment-15074683
] 

Heng Chen commented on HBASE-14949:
-----------------------------------

To be honest,  i want to wait for HBASE-15046 results.

If we move sync WAL before update memstore,  HBASE-14004 will be fixed naturally right?  
Everything will be much more simple if performance is OK. 



> Skip duplicate entries when replay WAL.
> ---------------------------------------
>
>                 Key: HBASE-14949
>                 URL: https://issues.apache.org/jira/browse/HBASE-14949
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Heng Chen
>         Attachments: HBASE-14949.patch, HBASE-14949_v1.patch, HBASE-14949_v2.patch
>
>
> As HBASE-14004 design,  there will be duplicate entries in different WAL.  It happens
when one hflush failed, we will close old WAL with 'acked hflushed' length,  then open a new
WAL and write the unacked hlushed entries into it.
> So there maybe some overlap between old WAL and new WAL.
> We should skip the duplicate entries when replay.  I think it has no harm to current
logic, maybe we do it first. 



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