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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4375) [hbck] Add region coverage visualization to hbck
Date Tue, 13 Sep 2011 19:03:09 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13103910#comment-13103910
] 

stack commented on HBASE-4375:
------------------------------

I tried applying and it fails.  Need to wait on other patches to go in first.  Flag me Jon
when this can go in (when we have necessary prereqs applied).  Good stuff.

> [hbck] Add region coverage visualization to hbck
> ------------------------------------------------
>
>                 Key: HBASE-4375
>                 URL: https://issues.apache.org/jira/browse/HBASE-4375
>             Project: HBase
>          Issue Type: New Feature
>    Affects Versions: 0.94.0, 0.90.5
>            Reporter: Jonathan Hsieh
>            Assignee: Jonathan Hsieh
>         Attachments: 0001-HBASE-4375-Add-region-coverage-visualization-to-hbck.patch
>
>
> After HBASE-4322 and HBASE-4321, we now have an accurate region splits / coverage map
for properly identifying holes, overlaps, backwards regions and other kinds of problems in
the .META. table.  hbck should display this information so that someone can fix this.
> A simple version for a table with regions [,A], [A,B], [A,C], [C,] and would dump out
something like this (showing an overlap in [A,B])
> :  ['table,,..', 'table,A,..']
> A: ['table,A,..', 'B'] ['table,A,..', 'C']
> B: ['table,A,..', 'C']  
> C: ['table,C', '']
> null:
> My first thought is '-details' should this dump the full region map including all good
and bad regions.  Without -details, any errors should dump info with some context -- dump
one region before problems, problem regions, and then one post problem region.
> Alternately we could add a new option or options to dump the region split map.
> What is the preferred way to toggle display of this information in hbck?

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