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https://issues.apache.org/jira/browse/HBASE-2802?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12890173#action_12890173
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stack commented on HBASE-2802:
------------------------------
In cluster testing I'll see messages like the below:
{code}
2010-07-19 14:14:48,065 INFO org.apache.hadoop.hbase.master.ServerManager:
Processing MSG_REPORT_SPLIT_INCLUDES_DAUGHTERS:
TestTable,0073837150,1279573828629: Daughters;
TestTable,0073837150,1279574087136, TestTable,0073971166,1279574087136 from
sv2borg188,60020,1279565949537; 1 of 1
2010-07-19 14:14:48,068 DEBUG org.apache.hadoop.hbase.master.RegionManager:
Assigning for address: 10.20.20.188:60020, startcode: 1279565949537, load:
(requests=0, regions=114, usedHeap=2183, maxHeap=3045): total nregions to
assign=2, regions to give other servers than this=0, isMetaAssign=false
2010-07-19 14:14:48,068 DEBUG org.apache.hadoop.hbase.master.RegionManager:
Assigning address: 10.20.20.188:60020, startcode: 1279565949537, load:
(requests=0, regions=114, usedHeap=2183, maxHeap=3045) 2 regions
2010-07-19 14:14:48,068 INFO org.apache.hadoop.hbase.master.RegionManager:
Assigning region TestTable,0073837150,1279574087136 to
sv2borg188,60020,1279565949537
2010-07-19 14:14:48,068 INFO org.apache.hadoop.hbase.master.RegionManager:
Passing on TestTable,0073971166,1279574087136 because contiguous with
TestTable,0073837150,1279574087136 (will assign next server that checks in)
2010-07-19 14:14:48,184 DEBUG org.apache.hadoop.hbase.master.RegionManager:
Assigning for address: 10.20.20.187:60020, startcode: 1279565949563, load:
(requests=0, regions=114, usedHeap=2166, maxHeap=3045): total nregions to
assign=1, regions to give other servers than this=0, isMetaAssign=false
2010-07-19 14:14:48,184 DEBUG org.apache.hadoop.hbase.master.RegionManager:
Assigning address: 10.20.20.187:60020, startcode: 1279565949563, load:
(requests=0, regions=114, usedHeap=2166, maxHeap=3045) 1 regions
2010-07-19 14:14:48,184 INFO org.apache.hadoop.hbase.master.RegionManager:
Assigning region TestTable,0073971166,1279574087136 to
sv2borg187,60020,1279565949563
{code}
It seems to be working.
> Stop daughter regions both being assigned same server
> -----------------------------------------------------
>
> Key: HBASE-2802
> URL: https://issues.apache.org/jira/browse/HBASE-2802
> Project: HBase
> Issue Type: Improvement
> Reporter: stack
> Fix For: 0.20.6
>
> Attachments: moz.txt
>
>
> On split, usually the two daughter regions end up on assignment list at same
> time. Dependent on cluster state and what balancer says, when a server
> checks in, we'll assign at least two regions in the one go so daughters then
> end up on same server. This patch makes it so we don't assign contiguous
> regions in the one assignment.
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