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From "Lars George (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2165) Improve fragmentation display and implementation
Date Tue, 09 Feb 2010 12:05:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12831431#action_12831431

Lars George commented on HBASE-2165:

@ryan, not sure if I understand. As we discussed above, we would query not at all or only
every N minutes, and since it hits the NN only it should be fast and not too resource intense
as it has it all in RAM I would suppose.

Also, you are not the target audience, you are not a "user" you are a hbase developer. I am
looking at those who use hbase in production but are not involved otherwise. Every bit of
information we can give them helps I'd say. And since we do not switch this on by default
it is left to those that wish to have the number to further see what their cluster does and
its status-quo. 

As I said above the reasoning is that a terribly fragmented cluster is going slower than it
should be. Just that rectifies why someone may want to know. It also adds the "size" of tables,
something that also is not visible right now to users. How much raw data is stored, that may
often be enough they need and no rowcounter run is required.

> Improve fragmentation display and implementation
> ------------------------------------------------
>                 Key: HBASE-2165
>                 URL: https://issues.apache.org/jira/browse/HBASE-2165
>             Project: Hadoop HBase
>          Issue Type: Improvement
>    Affects Versions: 0.20.4, 0.21.0
>            Reporter: Lars George
>            Priority: Minor
>             Fix For: 0.20.4, 0.21.0
> Improve by 
> - moving the "blocking" FS scan into a thread so that the UI loads fast and initially
displays "n/a" but once it has completed the scan it displays the proper numbers
> - explaining what fragmentation means to the user (better hints or help text in UI)
> - Switch -ROOT- (and maybe even .META.?) to simply say "Yes" or a tick that it is fragmented
as it only has 0% or 100% available (since it has only a single region)
> - also computing the space occupied by each table and the total and - if easily done
- add a graph to display it (Google Pie Chart would be nice but is an external link)

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