Naresh,
> How many regions are created after splitting the one region ?
Two.
> Do all the split regions remain on the same node that hosted the first region?
One half remains on the same node. The other is closed and released for
reassignment. Depending on the number of nodes and current cluster loading
conditions, the master may assign the region back to the same node or reassign
to another.
If there is insufficient data in a region to make a two way split, if the
region is read only, or if the compaction/split thread is already working on
the region, the request will be ignored, for that region.
- Andy
________________________________
From: Naresh Rapolu <nrap...@purdue.edu>
To: hbase-user@hadoop.apache.org
Sent: Wed, November 18, 2009 1:15:43 PM
Subject: Semantics of the split function
Hello,
May I know the actual working/semantics of a call to split(String
tableNameOrRegionName) function in HBaseAdmin class.
I mean, if all the data belonged to one region before the call to split
function, what can be deterministically expected of the result ? How many
regions are created after splitting the one region ? How are the split region
placed ? Do all the split regions remain on the same node that hosted the
first region ?
Thanks,
Naresh
