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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-902) Add force major compaction and force split to UI
Date Fri, 26 Sep 2008 22:57:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12635055#action_12635055
] 

Andrew Purtell commented on HBASE-902:
--------------------------------------

If this is going to happen, can we/I put in a client side method for forcing a split? An importer
process can be smart about splitting a region whenever the row key distribution is good, and
anyway pressing a button on the Master UI repeatedly seems a coarse way to do it (not that
I'm arguing against having such a button...)
 

> Add force major compaction and force split to UI
> ------------------------------------------------
>
>                 Key: HBASE-902
>                 URL: https://issues.apache.org/jira/browse/HBASE-902
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: stack
>
> Would help debugging or at start of big upload or if we have a hot region we want to
distribute over the cluster if we could just manually force the splitting of regions.
> I thought it would be just a little messing in jsp but its a bit more than that.
> Actual decision to split is made down in guts of the Store.  Won't split if any references
still around and a file must be > maxsize.
> Chatting w/ Jon Gray, could set a flag on the region that we want to split.  Could do
this from UI (Can get to HRegion instance from HRS instance in HRS jsp).  Stores have references
to their hosting regions (I think).  When figuring if we're to split, check the force split
flag up in the hosting region.
> To get the flag checked, safest way is to just force a flush (Otherwise, have to mess
w/ locks in the compact/splitter thread).  Registering a flush request on a region is easy
enough to do.  Its a public method on HRS (or HR).

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