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From "Mikhail Antonov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12125) Add Hbck option to check and fix WAL's from replication queue
Date Sat, 05 Sep 2015 00:19:46 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14731652#comment-14731652

Mikhail Antonov commented on HBASE-12125:

bq. I have a 0.98 patch for this. Will put for review.

Apparently the code base have moved forward since then, but curious if this patch still would
be relevant and useful here?

> Add Hbck option to check and fix WAL's from replication queue
> -------------------------------------------------------------
>                 Key: HBASE-12125
>                 URL: https://issues.apache.org/jira/browse/HBASE-12125
>             Project: HBase
>          Issue Type: Bug
>          Components: Replication
>            Reporter: Virag Kothari
>            Assignee: Virag Kothari
> The replication source will discard the WAL file in many cases when it encounters an
exception reading it . This can cause data loss
> and the underlying reason of failed read remains hidden.  Only in certain scenarios,
the replication source should dump the current WAL and move to the next one. 
> This JIRA aims to have an hbck option to check the WAL files of replication queues for
any inconsistencies and also provide an option to fix it.
> The fix can be to remove the file from replication queue in zk and from the memory of
replication source manager and replication sources. 
> A region server endpoint call from the hbck client to region server can be used to achieve
> Hbck can be configured with the following options:
> -softCheckReplicationWAL : Tries to open only the oldest WAL (the WAL currently read
by replication source) from replication queue. If there is a position associated, it also
seeks to that position and reads an entry from there
> -hardCheckReplicationWAL:  Check all WAL paths from replication queues by reading them
completely to make sure they are ok.
> -fixMissingReplicationWAL: Remove the WAL's from replication queues which are not present
on hdfs
> -fixCorruptedReplicationWAL:  Remove the WAL's from replication queues which are corrupted
(based on the findings from softCheck/hardCheck). Also the WAL's are moved to a quarantine
> -rollAndFixCorruptedReplicationWAL - If the current WAL is corrupted, it is first rolled
over and then deals with it in the same way as -fixCorruptedReplicationWAL option

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