[jira] [Commented] (ZOOKEEPER-2994) Tool required to recover log and snapshot entries with CRC errors

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16442089#comment-16442089 ] 

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

Github user nkalmar commented on the issue:

    https://github.com/apache/zookeeper/pull/487
  
    Useful addition, +1
    
    As @phunt pointed out, docs in zookeeperAdmin.xml could be updated.


> 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
>            Reporter: Andor Molnar
>            Assignee: Andor Molnar
>            Priority: Major
>             Fix For: 3.5.4, 3.6.0, 3.4.13
>
>
> 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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