hbase-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-902) Add force major compaction and force split to UI
Date Sat, 18 Oct 2008 05:46:46 GMT

    [ https://issues.apache.org/jira/browse/HBASE-902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12640753#action_12640753
] 

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

Reviewed patch and did basic testing.  Looks great to me.  Go commit it.

Be warned that the patch fails going into HRegionServer, IIRC, because HRS has changed since
this patch.  Fix is easy though.  Also, in your webapp changes, no such thing as isEmpty in
String.  Change the !isEmpty to key != null && key.length() > 0.

Its excellent hitting the split key, waiting a while, and then seeing your regions doubled
before your eyes.

How do I get at this new facility from the shell?  Its ok if I have to write a bit of code
to do it.  We just need to document it in FAQ or some place.

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, 902-2.patch, 902-3.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).

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message