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From "Christian Spriegel (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4905) Repair should exclude gcable tombstones from merkle-tree computation
Date Thu, 11 Apr 2013 20:59:15 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13629363#comment-13629363
] 

Christian Spriegel commented on CASSANDRA-4905:
-----------------------------------------------

Yeah, repair with TTLed columns can be nasty. Since November, I've seen repairs streaming
up to 90GB of data for a single repair. According to nodetool, this cluster had no dropped
writes. So I would assume it was consistent already.

Before, Sun Dec 23 08:00:01 UTC 2012:
192.168.1.1     datacenter1 rack1       Up     Normal  404.17 GB       33.33%  0         
                                 
192.168.1.2     datacenter1 rack1       Up     Normal  410.9 GB        33.33%  56713727820156410577229101238628035242
     
192.168.1.3     datacenter1 rack1       Up     Normal  404.27 GB       33.33%  113427455640312821154458202477256070484

After, Sun Dec 23 12:19:38 UTC 2012:
192.168.1.1     datacenter1 rack1       Up     Normal  497.95 GB       33.33%  0         
                                 
192.168.1.2     datacenter1 rack1       Up     Normal  413.26 GB       33.33%  56713727820156410577229101238628035242
     
192.168.1.3     datacenter1 rack1       Up     Normal  449.83 GB       33.33%  113427455640312821154458202477256070484


I'm not saying I want this patch in 1.1. I just wanted to share this rather spectecular repair
:-)
                
> Repair should exclude gcable tombstones from merkle-tree computation
> --------------------------------------------------------------------
>
>                 Key: CASSANDRA-4905
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4905
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Christian Spriegel
>            Assignee: Sylvain Lebresne
>             Fix For: 1.2.0 beta 3
>
>         Attachments: 4905.txt
>
>
> Currently gcable tombstones get repaired if some replicas compacted already, but some
are not compacted.
> This could be avoided by ignoring all gcable tombstones during merkle tree calculation.
> This was discussed with Sylvain on the mailing list:
> http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/repair-compaction-and-tombstone-rows-td7583481.html

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