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https://issues.apache.org/jira/browse/HBASE-10349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13872823#comment-13872823
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Matteo Bertozzi commented on HBASE-10349:
-----------------------------------------
I guess the problem has more to do with the disable step.
from the logs looks like the region afc82d1ceabbaca36a504b83b65fc0c9 was in the
list of region to delete,
since there is the log of "Archiving region". so it should also be removed from
meta by the MetaEditor.deleteRegions()
{code}
15909 2014-01-15 09:41:43,651 DEBUG [MASTER_TABLE_OPERATIONS-hor15n05:60000-0]
handler.DeleteTableHandler: Archiving region
tablethree_mod,,1389778226606.afc82d1ceabbaca36a504b83b65fc0c9. from FS
{code}
looking at the MetaEditor.tableExists() to see if is reading from META or from
the znode..
> 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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