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From "Christopher Tubbs (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-4078) Exclude special volumes
Date Mon, 21 Dec 2015 21:42:46 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-4078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15067109#comment-15067109
] 

Christopher Tubbs commented on ACCUMULO-4078:
---------------------------------------------

I created sub-tasks for the issues identified above, just for convenience.

> 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
>            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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