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https://issues.apache.org/jira/browse/HBASE-10349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13872853#comment-13872853
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Matteo Bertozzi commented on HBASE-10349:
-----------------------------------------
was MetaReader.tableExists()... and the rows seems directly from the meta
table...
any chances that we failed the MetaEditor.deleteRegions() or we are reading old
data from META?
the request to delete the region was sent
{code}
15908 2014-01-15 09:41:43,639 INFO
[MASTER_TABLE_OPERATIONS-hor15n05:60000-0] catalog.MetaEditor: Deleted
[{ENCODED => afc82d1ceabbaca36a504b83b65fc0c9, NAME =>
'tablethree_mod,,1389778226606.afc82d1ceabbaca36a504b83b65fc0c9.', STARTKEY =>
'', ENDKEY => ''}]
{code}
> Table became unusable when master balanced its region after table was dropped
> -----------------------------------------------------------------------------
>
> Key: HBASE-10349
> URL: https://issues.apache.org/jira/browse/HBASE-10349
> Project: HBase
> Issue Type: Bug
> Reporter: Ted Yu
> Attachments: 10349-output.log,
> hbase-hbase-master-hor15n05.gq1.ygridcore.net.log.tar.gz
>
>
> 0.98 was used.
> This was sequence of events:
> create 'tablethree_mod'
> snapshot 'tablethree_mod', 'snapshot_tablethree_mod'
> disable 'tablethree_mod'
> 2014-01-15 09:34:51,749 restore_snapshot 'snapshot_tablethree_mod'
> 2014-01-15 09:35:07,210 enable 'tablethree_mod'
> 2014-01-15 09:35:46,134 delete_snapshot 'snapshot_tablethree_mod'
> 2014-01-15 09:41:42,210 disable 'tablethree_mod'
> 2014-01-15 09:41:43,610 drop 'tablethree_mod'
> create 'tablethree_mod'
> For the last table creation request:
> {code}
> 2014-01-15 10:03:52,999|beaver.component.hbase|INFO| 'create 'tablethree_mod',
> {NAME => 'f1', VERSIONS => 3}
> ,
> {NAME => 'f2', VERSIONS => 3}
> ,
> {NAME => 'f3', VERSIONS => 3}
> '
> 2014-01-15 10:03:52,999|beaver.component.hbase|INFO| 'exists 'tablethree_mod''
> 2014-01-15 10:03:52,999|beaver.component.hbase|INFO| 'put 'tablethree_mod',
> '0', 'f1:q1', 'value-0', 10'
> 2014-01-15 10:03:52,999|beaver.component.hbase|INFO| 'put 'tablethree_mod',
> '1', 'f1:q1', 'value-1', 20'
> 2014-01-15 10:03:53,000|beaver.component.hbase|INFO| 'put 'tablethree_mod',
> '2', 'f2:q2', 'value-2', 30'
> 2014-01-15 10:03:53,000|beaver.component.hbase|INFO| 'put 'tablethree_mod',
> '3', 'f3:q3', 'value-3', 40'
> 2014-01-15 10:03:53,000|beaver.component.hbase|INFO| 'put 'tablethree_mod',
> '4', 'f3:q3', 'value-4', 50'
> 2014-01-15 10:03:53,000|beaver.component.hbase|INFO|Done writing commands to
> file. Will execute them now.
> 2014-01-15 10:03:53,000|beaver.machine|INFO|RUNNING: /usr/lib/hbase/bin/hbase
> shell /grid/0/tmp/hwqe/artifacts/tmp-471142
> 2014-01-15 10:03:55,878|beaver.machine|INFO|2014-01-15 10:03:55,878 INFO
> [main] Configuration.deprecation: hadoop.native.lib is deprecated. Instead,
> use io.native.lib.available
> 2014-01-15 10:03:57,283|beaver.machine|INFO|2014-01-15 10:03:57,283 WARN
> [main] conf.Configuration: hbase-site.xml:an attempt to override final
> parameter: dfs.support.append; Ignoring.
> 2014-01-15 10:03:57,669|beaver.machine|INFO|2014-01-15 10:03:57,669 WARN
> [main] conf.Configuration: hbase-site.xml:an attempt to override final
> parameter: dfs.support.append; Ignoring.
> 2014-01-15 10:03:57,720|beaver.machine|INFO|2014-01-15 10:03:57,720 WARN
> [main] conf.Configuration: hbase-site.xml:an attempt to override final
> parameter: dfs.support.append; Ignoring.
> 2014-01-15 10:03:57,997|beaver.machine|INFO|
> 2014-01-15 10:03:57,997|beaver.machine|INFO|ERROR: Table already exists:
> tablethree_mod!
> 2014-01-15 10:03:57,997|beaver.machine|INFO|
> {code}
> This was an intermittent issue after using Snapshots, a table is not properly
> dropped / and not able to properly re-create with the same name. And a
> HRegion is empty or null Error occurs. (When you try to drop the table it
> says it does not exist, and when you try to create the table it says that it
> does already exist).
> {code}
> 2014-01-15 10:04:02,462|beaver.machine|INFO|ERROR: HRegionInfo was null or
> empty in hbase:meta, row=keyvalues=
> {tablethree_mod,,1389778226606.afc82d1ceabbaca36a504b83b65fc0c9./info:seqnumDuringOpen/1389778905355/Put/vlen=8/mvcc=0,
>
> tablethree_mod,,1389778226606.afc82d1ceabbaca36a504b83b65fc0c9./info:server/1389778905355/Put/vlen=32/mvcc=0,
>
> tablethree_mod,,1389778226606.afc82d1ceabbaca36a504b83b65fc0c9./info:serverstartcode/1389778905355/Put/vlen=8/mvcc=0}
>
> {code}
> Thanks to Huned who discovered this issue.
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