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From "Matt Peterson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-4078) Exclude special volumes
Date Sat, 19 Dec 2015 14:17:46 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-4078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15065387#comment-15065387
] 

Matt Peterson commented on ACCUMULO-4078:
-----------------------------------------

I don't seem to have the rights to assign this to myself, but feel free to assign me.  Thanks!

> 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:
> 1. 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.
> 2. It's not currently possible to specify preferred volumes for the write-ahead logs
> 3. 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.
> 4. 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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