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From "Arya Goudarzi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4730) CommitLogReplayer should report the bad CRC checksum in the log
Date Mon, 01 Oct 2012 20:43:07 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13467167#comment-13467167
] 

Arya Goudarzi commented on CASSANDRA-4730:
------------------------------------------

>1. there is no action you can take to mitigate given that the commitlog entry is probably
not readable in the first place

I spent 2 days trying to figure out why I had a data loss during shutdowns until I was told
about this. I compiled a version with logging, and tried to reproduce the scenario which resulted
in missing data, and I was able to at least get a notification of what happened that caused
commit log not to get replayed. If I had that hint earlier, something could have triggered
in my head earlier to try and tune commit log sync settings better so I don't get data loss.


>2. checksum mismatch is not even a reliable indicator of unclean shutdown

Please advice, what can be a reliable indicator as I really think this is a critical scenario
to detect. 


                
> CommitLogReplayer should report the bad CRC checksum in the log
> ---------------------------------------------------------------
>
>                 Key: CASSANDRA-4730
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4730
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.1.5
>         Environment: Cassandra 1.1.5
>            Reporter: Arya Goudarzi
>
> If commit log isn't fully fsynced, the record which fails the checksum is not replayed
do this logic. It would be beneficial to log that as an error so that user can know easily
what happened.
> "./src/java/org/apache/cassandra/db/commitlog/CommitLogReplayer.java" line 188 of 287
--65%-- col 54

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