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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2994) Tool required to recover log and snapshot entries with CRC errors
Date Wed, 25 Apr 2018 09:09:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16451931#comment-16451931
] 

ASF GitHub Bot commented on ZOOKEEPER-2994:
-------------------------------------------

Github user anmolnar commented on the issue:

    https://github.com/apache/zookeeper/pull/508
  
    I will rather remove the dependency and change the implementation to behave similarly
without it, so that we can merge this safely.


> Tool required to recover log and snapshot entries with CRC errors
> -----------------------------------------------------------------
>
>                 Key: ZOOKEEPER-2994
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2994
>             Project: ZooKeeper
>          Issue Type: New Feature
>    Affects Versions: 3.5.4, 3.6.0
>            Reporter: Andor Molnar
>            Assignee: Andor Molnar
>            Priority: Major
>             Fix For: 3.5.4, 3.6.0
>
>
> In the even that the zookeeper transaction log or snapshot become corrupted and fail
CRC checks (preventing startup) we should have a mechanism to get the cluster running again.
> Previously we achieved this by loading the broken transaction log with a modified version
of ZK with disabled CRC check and forced it to snapshot.
> It'd very handy to have a tool which can do this for us. LogFormatter and SnapshotFormatter
have already been designed to dump log and snapshot files, it'd be nice to extend their functionality
and add ability for such recovery.
> It has proven that once you end up with the corrupt txn log there is no way to recover
except manually modifying the crc check. That's basically why the tool is needed.



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