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From "Eric Newton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3263) re-write tablet directories to fairly use multiple name-nodes
Date Mon, 27 Oct 2014 20:32:34 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14185752#comment-14185752
] 

Eric Newton commented on ACCUMULO-3263:
---------------------------------------

Alternatively, new directories will be chosen for a clone, so you can use clone.

{noformat}
shell> offline -t tableName -w
shell> clonetable tableName temp
shell> renametable tableName oldTableName
shell> renametable temp tableName
shell> online -t tableName -w
{noformat}

When you are comfortable that all is working well, delete the original:
{noformat}
shell> deletetable -f oldTableName
{noformat}


> re-write tablet directories to fairly use multiple name-nodes
> -------------------------------------------------------------
>
>                 Key: ACCUMULO-3263
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3263
>             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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