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https://issues.apache.org/jira/browse/ACCUMULO-4078?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Christopher Tubbs updated ACCUMULO-4078:
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Description:
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.
was:
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.
> 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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