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https://issues.apache.org/jira/browse/CASSANDRA-5126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13547277#comment-13547277
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Nate McCall commented on CASSANDRA-5126:
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So - looks like the jars were updated in the lib dir, but not in the build.xml.
The ramifications of this are that *anything* referencing cassandra on maven
central will have the older versions of jackson brought in as dependencies
(cough. DSE. cough.).
> Upgrade version of Jackson to avoid concurrency issues with M/R tasks
> ---------------------------------------------------------------------
>
> Key: CASSANDRA-5126
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5126
> Project: Cassandra
> Issue Type: Bug
> Components: Hadoop
> Affects Versions: 1.1.8, 1.2.0
> Reporter: Nate McCall
> Assignee: Nate McCall
> Priority: Minor
> Fix For: 1.2.2
>
> Attachments: 5126.txt
>
>
> Older version of Jackson ASL has a concurrency issue. See
> http://jira.codehaus.org/browse/JACKSON-237
> This can be triggered in some environments when running M/R tasks and the
> wrong version of jackson gets picked up.
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