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https://issues.apache.org/jira/browse/ACCUMULO-4078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15067257#comment-15067257
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Christopher Tubbs commented on ACCUMULO-4078:
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bq. What's the net benefit of keeping a static temporary directory for a tablet?
I'm not convinced there's even a benefit to having a static non-temporary
directory for a tablet (srv:dir). Personally, I'd prefer choosing on every file
creation (with as much information about the scope/environment as possible, so
it can make a good decision based on current configuration vs. a past
decision)... ACCUMULO-3090
bq. My first reaction is that it seems unnecessary to provide multiple
"general*" volume chooser properties
I agree. Some of the situations might be considered distinct "scopes"
appropriate for a special config. However, many others might be behavior
dependent on a particular configured global or per-table chooser, and it might
be more appropriate to provide ACCUMULO-3384 to empower those various
implementations.
> Exclude special volumes
> -----------------------
>
> Key: ACCUMULO-4078
> URL: https://issues.apache.org/jira/browse/ACCUMULO-4078
> Project: Accumulo
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.7.0
> Reporter: Matt Peterson
> Assignee: Matt Peterson
> Priority: Minor
> Labels: newbie
> Fix For: 1.8.0
>
>
> A few improvements to the {{VolumeChooser}} are desired for a use case that
> seems general enough to warrant an update to Accumulo.
> *Use Case:*
> A new volume is added, with limited capacity, to be dedicated for a specific
> table. All other tables or files should be excluded from this new volume.
> *Suggested Improvements:*
> # Update the signature for {{VolumeManager.choose}} to take a
> {{VolumeChooserEnvironment}} instead of {{Optional<String>}}. This will
> allow future parameters for volume selection without repeatedly changing the
> {{VolumeManager}} interface.
> # It's not currently possible to specify preferred volumes for the
> write-ahead logs
> # In several places including {{PreferredVolumeChooser}},
> {{PerTableVolumeChooser}} and {{VolumeManagerImpl}}, the failsafe chooser is
> the {{RandomVolumeChooser}} which will include the instance volume that needs
> to be excluded. It would be useful to have a configurable failsafe in this
> situation.
> # The volume chooser is called in {{FileUtils}} for temp directory creation
> but it could instead use the sticky dir to create the temp directory, not
> needing the volume chooser at all.
> The above suggestions could become sub-tickets. Note that the improvements
> listed have been implemented for my particular instance and I hope to submit
> them as a patch.
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