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From "Josh Elser (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-3263) re-write tablet directories to fairly use multiple name-nodes
Date Tue, 28 Oct 2014 01:24:33 GMT


Josh Elser commented on ACCUMULO-3263:

I (embarasingly) don't know what upgrade code you're referring to. I thought we didn't have
any upgrade code to 1.6 and it was all done in-place by the master. I also thought that file/dir
references were lazily rewritten in the metadata after 1.6 was brought up which was the reason
I asked in the first place.

Please let me know how I'm wrong :)

> 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
> 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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