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https://issues.apache.org/jira/browse/ACCUMULO-1771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13852192#comment-13852192
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Sean Busbey commented on ACCUMULO-1771:
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[~kturner], I believe Mike is talking about the [HDFS Federation built into
Hadoop|http://hadoop.apache.org/docs/r2.2.0/hadoop-project-dist/hadoop-hdfs/Federation.html]
Under that, I believe only a single NameNode would be responsible for the part
of the namespace that defines the instance id and version information.
> Instance id and version info only stored on one hdfs instance
> -------------------------------------------------------------
>
> Key: ACCUMULO-1771
> URL: https://issues.apache.org/jira/browse/ACCUMULO-1771
> Project: Accumulo
> Issue Type: Sub-task
> Components: master, tserver
> Reporter: Keith Turner
> Priority: Critical
> Fix For: 1.6.0
>
>
> When instance.volumes contains multiple uris only the first one is
> initialized with the data version and instance id. If the user changes the
> order of the uris in the config, it seems like Accumulo will stop working
> correctly.
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