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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-902) Add force major compaction and force split to UI
Date Sat, 11 Oct 2008 03:52:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638709#action_12638709
] 

stack commented on HBASE-902:
-----------------------------

Yeah on the bit of doc.

What if table has many regions?  Where does the button go then?   Does the midkey determine
which region to squash?  Maybe squash the optional midkey and let the system figure it out?

On major compactions, lads here were asking if it'd be possible to run a major compaction
on a table, not just a region?

Good stuff Andrew.

> 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, split.png
>
>
> 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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