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Date: Thu, 2 Oct 2008 15:03:44 -0700 (PDT)
From: "Andrew Purtell (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Commented: (HBASE-902) Add force major compaction and force
 split to UI
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    [ https://issues.apache.org/jira/browse/HBASE-902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12636482#action_12636482 ] 

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

HStore has a reference to its HRI but not to the HRegion. Instead of using HRI I could just convert the reference that HStore has to the region to HRegion and fix up the affected code. 

Don't know about metautils. 

If a HStore still holds references, the split request will be ignored. The only thing the "force split' request does differently is ask that the HStore max file size be effectively considered to be 1. 

If the regionserver is already part way into the split, it should be ignored also but I'll double check this. compactSplitThread and children should handle the case already. If not they should. 

> 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
>            Assignee: Andrew Purtell
>         Attachments: 902-1.patch
>
>
> 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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