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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:
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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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