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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14949) Skip duplicate entries when replay WAL.
Date Fri, 11 Dec 2015 03:01:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15052072#comment-15052072
] 

Duo Zhang commented on HBASE-14949:
-----------------------------------

And the only thing I am still a little worry about is how memstore and compaction deal with
two cells with same rowkey, same family, same qualifier and same timestamp. Let me check the
code and have a try.

Thanks.

> 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
>
>
> 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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