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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-902) Add force compaction and force split operations to UI and Admin
Date Fri, 28 Nov 2008 07:12:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12651476#action_12651476
] 

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

+1 on patch.  FYI Andrew for next time, the general hadoop style adds '{' parenthesis even
if only one line inside the curly-braces.  Good stuff.

> Add force compaction and force split operations to UI and Admin
> ---------------------------------------------------------------
>
>                 Key: HBASE-902
>                 URL: https://issues.apache.org/jira/browse/HBASE-902
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: stack
>            Assignee: Andrew Purtell
>             Fix For: 0.19.0
>
>         Attachments: 902-1.patch, 902-2.patch, 902-3.patch, 902.fix.patch, split.png,
ui.1.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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