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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-9116) Add a view/edit tool for favored node mappings for regions
Date Tue, 27 Aug 2013 01:21:52 GMT

     [ https://issues.apache.org/jira/browse/HBASE-9116?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Devaraj Das updated HBASE-9116:

    Attachment: 9116-5.txt

Sorry for the delay in responding. I couldn't get to it until now. Attached patch takes care
of the comments.

bq. Why updateFavoredNodes takes an OpenRegionRequest?
That's because the argument serves all the purpose of what is needed in the updateFavoredNodes
RPC. I am open to defining a new argument if you think that'd be better.

bq. Is the hbase-site.xml change intentional?
Nope. Accidental..

bq. Can we create a similar putsToMetaTable method which takes a conf in MetaEditor? We need
to handle exceptions and close the table at the end.
Done (added close)

bq. Perhaps, it is better to log the stack trace as well


bq. Some function may not throw exception declared


bq. Good stuff. Is this still WIP? How can we use this? Edit the meta table from hbase shell?

This is mostly complete. It needs more real life testing. The RegionPlacementMaintainer in
the patch has the commands to update meta (can be run like a regular Java app). That's the
tool added (which is the majority of the code in this patch).

> Add a view/edit tool for favored node mappings for regions
> ----------------------------------------------------------
>                 Key: HBASE-9116
>                 URL: https://issues.apache.org/jira/browse/HBASE-9116
>             Project: HBase
>          Issue Type: Improvement
>          Components: Region Assignment
>    Affects Versions: 0.95.0
>            Reporter: Devaraj Das
>            Assignee: Devaraj Das
>             Fix For: 0.96.0
>         Attachments: 9116-1.txt, 9116-2.txt, 9116-2.txt, 9116-2.txt, 9116-3.txt, 9116-4.txt,
> Add a tool that one can run offline to view the favored node mappings for regions, and
also fix the mappings if needed. Such a tool exists in the 0.89-fb branch. Will port it over
to trunk/0.95.

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