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https://issues.apache.org/jira/browse/CASSANDRA-4078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13242767#comment-13242767
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paul cannon commented on CASSANDRA-4078:
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Ok, so there are definitely out-of-order keys in your sstables. I have no good 
theories as to how that happened- I don't think anyone else has run into this. 
Were you possibly using any sort of custom types or parameterized types with 
0.8.9? Custom anything?

Either way, the thing to be done now is probably to get your data sorted. Maybe 
we can come up with a one-off tool of some kind to read the values and write 
them back out in a sorted way.
                
> StackOverflowError when upgrading to 1.0.8 from 0.8.10
> ------------------------------------------------------
>
>                 Key: CASSANDRA-4078
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4078
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.8.10
>         Environment: OS: Linux xps.openfin 2.6.35.13-91.fc14.i686 #1 SMP Tue 
> May 3 13:36:36 UTC 2011 i686 i686 i386 GNU/Linux
> Java: JVM vendor/version: Java HotSpot(TM) Server VM/1.6.0_31
>            Reporter: Wenjun
>            Assignee: paul cannon
>            Priority: Critical
>             Fix For: 0.8.10
>
>         Attachments: 4078.add-asserts.txt, cassandra.yaml.1.0.8, 
> cassandra.yaml.8.10, keycheck.txt, system.log, system.log.0326, 
> system.log.0326-02
>
>
> Hello
> I am trying to upgrade our 1-node setup from 0.8.10 to 1.0.8 and seeing the 
> following exception when starting up 1.0.8.  We have been running 0.8.10 
> without any issues.
>  
> Attached is the entire log file during startup of 1.0.8.  There are 2 
> exceptions:
> 1. StackOverflowError (line 2599)
> 2. InstanceAlreadyExistsException (line 3632)
> I tried "run scrub" under 0.8.10 first, it did not help.  Also, I tried 
> dropping the column family which caused the exception, it just got the same 
> exceptions from another column family.
> Thanks

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