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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2165) Improve fragmentation display and implementation
Date Thu, 04 Feb 2010 18:02:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12829673#action_12829673
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stack commented on HBASE-2165:
------------------------------

I don't know how to throttle it.   Its a query to NN if IIRC so maybe not too bad.  Should
be done rarely though -- every 5 minutes?  Every ten minutes?  Can you check it?  See if under
load hbase throughput goes down when full lsr or just browse how this is done in hadoop code
to check no big synchronization block or something over on the NN?

I agree needs more explaination at a minimum.  I'm still not sure what it indicates (Witness
Cosmin question up on IRC yesterday).

> 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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