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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 Fri, 26 Sep 2008 23:05:46 GMT

    [ https://issues.apache.org/jira/browse/HBASE-902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12635058#action_12635058
] 

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

Go for it.

Its easy in UI since you have the HRS context just there.  Running split from client is a
bit harder in that you have to add support for new admin message.  Rather than an a message
per, should we just add support once for a Writable version of http://java.sun.com/j2se/1.4.2/docs/api/java/util/EventObject.html?
 Split would be the first message type.  Flush, Major Compact, Merge could be others.  UI
and Client could send same eventing mechanism.

> 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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