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https://issues.apache.org/jira/browse/HBASE-1890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12762867#action_12762867
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stack commented on HBASE-1890:
------------------------------
I should back out regionserver reopening bottom half or I should set the .META.
myself over in regionserver adding startcode and server cells to .META..
Regards the latter, what if it takes a long time opening the region? The
alternative is that the new region is without a home until its successfully
opened on a new server which isn't much better.
> hbase-1506 where assignment is done at regionserver doesn't work
> ----------------------------------------------------------------
>
> Key: HBASE-1890
> URL: https://issues.apache.org/jira/browse/HBASE-1890
> Project: Hadoop HBase
> Issue Type: Bug
> Reporter: stack
> Fix For: 0.20.1, 0.21.0
>
>
> I have been running testing of 0.20.1 and found a bunch of cases where
> regionserver adding the bottom half to .META. itself is causing double
> assignment; we add the regioninfo over on the regionserver and then queue up
> the opening of the region. Meantime along comes BaseScanner and it finds the
> two new regions, one of which its in charge of assigning but one of which its
> not to assign -- but it does because the server and startcode are empty.
> Here is example:
> {code}
> 2009-10-07 03:02:08,792 DEBUG org.apache.hadoop.hbase.master.BaseScanner:
> Current assignment of TestTable,0033622754,1254884526868 is not valid;
> serverAddress=, startCode=0 unknown.
> 2009-10-07 03:02:08,796 DEBUG org.apache.hadoop.hbase.master.BaseScanner:
> Current assignment of TestTable,0034099554,1254884526868 is not valid;
> serverAddress=, startCode=0 unknown.
> 2009-10-07 03:02:08,872 DEBUG org.apache.hadoop.hbase.master.RegionManager:
> Assigning for address: XX.XX.XX.142:60020, startcode: 1254862426199, load:
> (requests=379, regions=125, usedHeap=1856, maxHeap=3391): t
> otal nregions to assign=2, nregions to reach balance=0, isMetaAssign=false
> 2009-10-07 03:02:08,872 DEBUG org.apache.hadoop.hbase.master.RegionManager:
> Doing for address: XX.XX.XX.142:60020, startcode: 1254862426199, load:
> (requests=379, regions=125, usedHeap=1856, maxHeap=3391) nregio
> ns: 2 and nRegionsToAssign: 2
> 2009-10-07 03:02:08,872 INFO org.apache.hadoop.hbase.master.RegionManager:
> Assigning region TestTable,0033622754,1254884526868 to
> aa0-000-15.example.org,60020,1254862426199
> 2009-10-07 03:02:08,872 INFO org.apache.hadoop.hbase.master.RegionManager:
> Assigning region TestTable,0034099554,1254884526868 to
> aa0-000-15.example.org,60020,1254862426199
> 2009-10-07 03:02:09,908 INFO org.apache.hadoop.hbase.master.ServerManager:
> Processing MSG_REPORT_SPLIT: TestTable,0033622754,1254873112948: Daughters;
> TestTable,0033622754,1254884526868, TestTable,0034099554,125
> 4884526868 from aa0-000-12.example.org,60020,1254862426179; 1 of 4
> 2009-10-07 03:02:09,915 INFO org.apache.hadoop.hbase.master.RegionManager:
> Assigning region TestTable,0033622754,1254884526868 to
> aa0-000-12.example.org,60020,1254862426179
> 2009-10-07 03:02:09,915 WARN org.apache.hadoop.hbase.master.RegionManager:
> Cannot assign a region that is not currently unassigned. FIX!! State:
> name=TestTable,0033622754,1254884526868, unassigned=false, pending
> Open=true, open=false, closing=false, pendingClose=false, closed=false,
> offlined=false
> 2009-10-07 03:02:09,922 INFO org.apache.hadoop.hbase.master.ServerManager:
> Processing MSG_REPORT_OPEN: TestTable,0033622754,1254884526868 from
> aa0-000-12.example.org,60020,1254862426179; 4 of 4
> 2009-10-07 03:02:09,922 DEBUG org.apache.hadoop.hbase.master.HMaster:
> Processing todo: PendingOpenOperation from
> aa0-000-12.example.org,60020,1254862426179
> 2009-10-07 03:02:09,922 INFO
> org.apache.hadoop.hbase.master.RegionServerOperation:
> TestTable,0033622754,1254884526868 open on XX.XX.XX.139:60020
> 2009-10-07 03:02:09,924 INFO
> org.apache.hadoop.hbase.master.RegionServerOperation: Updated row
> TestTable,0033622754,1254884526868 in region .META.,,1 with
> startcode=1254862426179, server=XX.XX.XX.139:60020
> 2009-10-07 03:02:11,904 INFO org.apache.hadoop.hbase.master.ServerManager:
> Processing MSG_REPORT_PROCESS_OPEN: TestTable,0034099554,1254884526868 from
> aa0-000-15.example.org,60020,1254862426199; 1 of 3
> 2009-10-07 03:02:11,904 INFO org.apache.hadoop.hbase.master.ServerManager:
> Processing MSG_REPORT_OPEN: TestTable,0033622754,1254884526868 from
> aa0-000-15.example.org,60020,1254862426199; 2 of 3
> 2009-10-07 03:02:11,904 DEBUG org.apache.hadoop.hbase.master.ServerManager:
> region server XX.XX.XX.142:60020 should not have opened region
> TestTable,0033622754,1254884526868
> {code}
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