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From "Christopher Tubbs (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-3263) re-write tablet directories to fairly use multiple name-nodes
Date Wed, 29 Oct 2014 03:15:33 GMT


Christopher Tubbs commented on ACCUMULO-3263:

I looked at the commit applied for this issue, and I'm wondering, why "randomize volumes",
specifically? Why not just leverage the configured VolumeChooser (or one specified with a
parameter) to reset the tablet directories according to an existing policy?

> re-write tablet directories to fairly use multiple name-nodes
> -------------------------------------------------------------
>                 Key: ACCUMULO-3263
>                 URL:
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: client
>    Affects Versions: 1.6.0, 1.6.1
>            Reporter: Eric Newton
>            Assignee: Eric Newton
>             Fix For: 1.7.0
>          Time Spent: 50m
>  Remaining Estimate: 0h
> When upgrading a very large cluster from 1.5 to 1.6, users can add new NNs for additional
scaling.  Unfortunately, all the current tablet directories will be on the original NN. Of
course, over time, new directories will begin using the new NNs, but for a large cluster,
this may never result in fair NN use.
> Create a utility that will re-write offline tablet directory entries so that future files
will be re-written using all NNs in a fair way.

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