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https://issues.apache.org/jira/browse/ACCUMULO-1771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13852335#comment-13852335
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Christopher Tubbs commented on ACCUMULO-1771:
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{quote}What's the use case for running Accumulo with different kinds of
volumes?{quote}
Well, there's possibly {{tmpfs}}, with a custom {{general.volume.chooser}}.
But, also, generally, there's the use case of expansion or combining two
instances.
In general, I'd probably not recommend using two different kinds of
filesystems, but I do think Accumulo should be agnostic to the implementation
of the volume.
> 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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