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https://issues.apache.org/jira/browse/HBASE-532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12588896#action_12588896
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stack commented on HBASE-532:
-----------------------------
Happened on the Lars cluster a few days ago:
{code}
2008-04-08 01:41:09,087 DEBUG org.apache.hadoop.hbase.HMaster: Received
MSG_REPORT_OPEN : pdc-docs,US6933067_20050823,1207644063095 from
192.168.105.61:60020
2008-04-08 01:41:09,087 INFO org.apache.hadoop.hbase.HMaster:
192.168.105.61:60020 serving pdc-docs,US6933067_20050823,1207644063095
2008-04-08 01:41:09,088 INFO org.apache.hadoop.hbase.HMaster: regionname:
pdc-docs,US6933067_20050823,1207644063095, startKey: <US6933067_20050823>,
endKey: <US6966561_20051122>, encodedName: 582319641, tableDesc: {name:
pdc-docs, families: {contents:={na
e: contents, max versions: 3, compression: NONE, in memory: false, max length:
2147483647, bloom filter: none}, language:={name: language, max versions: 3,
compression: NONE, in memory: false, max length: 2147483647, bloom filter:
none}, mimetype:={name:
imetype, max versions: 3, compression: NONE, in memory: false, max length:
2147483647, bloom filter: none}}} open on 192.168.105.61:60020
2008-04-08 01:41:09,088 INFO org.apache.hadoop.hbase.HMaster: updating row
pdc-docs,US6933067_20050823,1207644063095 in table .META.,,1 with startcode
1207556447704 and server 192.168.105.61:60020
2008-04-08 01:41:09,320 DEBUG org.apache.hadoop.hbase.HMaster:
HMaster.metaScanner regioninfo: {regionname:
pdc-docs,US6933067_20050823,1207644063095, startKey: <US6933067_20050823>,
endKey: <US6966561_20051122>, encodedName: 582319641, tableDesc: {name:
dc-docs, families: {contents:={name: contents, max versions: 3, compression:
NONE, in memory: false, max length: 2147483647, bloom filter: none},
language:={name: language, max versions: 3, compression: NONE, in memory:
false, max length: 2147483647, bloo
filter: none}, mimetype:={name: mimetype, max versions: 3, compression: NONE,
in memory: false, max length: 2147483647, bloom filter: none}}}}, server: ,
startCode: -1
2008-04-08 01:41:09,320 DEBUG org.apache.hadoop.hbase.HMaster: Current
assignment of pdc-docs,US6933067_20050823,1207644063095 is not valid:
storedInfo: null, startCode: -1, storedInfo.startCode: -1, unassignedRegions:
false, pendingRegions: false
2008-04-08 01:41:11,919 INFO org.apache.hadoop.hbase.HMaster: assigning region
pdc-docs,US6933067_20050823,1207644063095 to server 192.168.105.67:60020
{code}
See how we update .META. with server and start code for 61 but the ongoing
.META. scan does not see the new entry -- because we used to copy the current
state of memcache into the scanner -- so it reassigns the region.
A mapfile goes missing in the huddle. I'm going to blame this bug for now (two
regions fighting over map files).
> Odd interaction between HRegion.get, HRegion.deleteAll and compactions
> ----------------------------------------------------------------------
>
> Key: HBASE-532
> URL: https://issues.apache.org/jira/browse/HBASE-532
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.2.0, 0.1.1
> Reporter: Jim Kellerman
> Assignee: stack
> Priority: Blocker
> Fix For: 0.2.0, 0.1.2
>
> Attachments: 532.patch
>
>
> If you apply the patch for HBASE-483 to the 0.1 branch and comment out lines
> 309 and 315 of MetaUtils.java (which force compactions of the root and meta
> regions respectively), TestMergeTool fails. Why forcing compactions makes the
> test succeed is a mystery to me.
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