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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6588) enable table throws npe and leaves trash in zk in competition with delete table
Date Tue, 21 Aug 2012 07:21:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13438512#comment-13438512
] 

Hadoop QA commented on HBASE-6588:
----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12541719/HBASE-6588-trunk-v6.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +1 hadoop2.0.  The patch compiles against the hadoop 2.0 profile.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    -1 javac.  The applied patch generated 5 javac compiler warnings (more than the trunk's
current 4 warnings).

    -1 findbugs.  The patch appears to introduce 6 new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

     -1 core tests.  The patch failed these unit tests:
                       org.apache.hadoop.hbase.master.TestDistributedLogSplitting
                  org.apache.hadoop.hbase.regionserver.TestSplitTransactionOnCluster
                  org.apache.hadoop.hbase.master.TestAssignmentManager
                  org.apache.hadoop.hbase.client.TestAdmin
                  org.apache.hadoop.hbase.TestMultiVersions

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/2636//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/2636//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop2-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/2636//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop1-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/2636//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/2636//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/2636//artifact/trunk/patchprocess/newPatchFindbugsWarningshbase-server.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/2636//console

This message is automatically generated.
                
> enable table throws npe and leaves trash in zk in competition with delete table
> -------------------------------------------------------------------------------
>
>                 Key: HBASE-6588
>                 URL: https://issues.apache.org/jira/browse/HBASE-6588
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.94.0
>            Reporter: Zhou wenjian
>            Assignee: Zhou wenjian
>             Fix For: 0.94.2
>
>         Attachments: HBASE-6588-trunk.patch, HBASE-6588-trunk-v2.patch, HBASE-6588-trunk-v3.patch,
HBASE-6588-trunk-v4.patch, HBASE-6588-trunk-v5.patch, HBASE-6588-trunk-v6.patch
>
>
> 2012-08-15 19:23:36,178 DEBUG org.apache.hadoop.hbase.client.ClientScanner: Creating
scanner over .META. starting at key 'test,,'
> 2012-08-15 19:23:36,178 DEBUG org.apache.hadoop.hbase.client.ClientScanner: Advancing
internal scanner to startKey at 'test,,'
> 2012-08-15 19:24:09,180 DEBUG org.apache.hadoop.hbase.client.ClientScanner: Creating
scanner over .META. starting at key ''
> 2012-08-15 19:24:09,180 DEBUG org.apache.hadoop.hbase.client.ClientScanner: Advancing
internal scanner to startKey at ''
> 2012-08-15 19:24:09,183 DEBUG org.apache.hadoop.hbase.client.ClientScanner: Finished
with scanning at {NAME => '.META.,,1', STARTKEY => '', ENDKEY => '', ENCODED =>
1028785192,}
> 2012-08-15 19:24:09,183 DEBUG org.apache.hadoop.hbase.master.CatalogJanitor: Scanned
2 catalog row(s) and gc'd 0 unreferenced parent region(s)
> 2012-08-15 19:25:12,260 DEBUG org.apache.hadoop.hbase.master.handler.DeleteTableHandler:
Deleting region test,,1345029764571.d1e24b251ca6286c840a9a5f571b7db1. from META and FS
> 2012-08-15 19:25:12,263 INFO org.apache.hadoop.hbase.catalog.MetaEditor: Deleted region
test,,1345029764571.d1e24b251ca6286c840a9a5f571b7db1. from META
> 2012-08-15 19:25:12,265 INFO org.apache.hadoop.hbase.master.handler.EnableTableHandler:
Attemping to enable the table test
> 2012-08-15 19:25:12,265 WARN org.apache.hadoop.hbase.zookeeper.ZKTable: Moving table
test state to enabling but was not first in disabled state: null
> 2012-08-15 19:25:12,267 DEBUG org.apache.hadoop.hbase.client.ClientScanner: Creating
scanner over .META. starting at key 'test,,'
> 2012-08-15 19:25:12,267 DEBUG org.apache.hadoop.hbase.client.ClientScanner: Advancing
internal scanner to startKey at 'test,,'
> 2012-08-15 19:25:12,270 DEBUG org.apache.hadoop.hbase.client.ClientScanner: Finished
with scanning at {NAME => '.META.,,1', STARTKEY => '', ENDKEY => '', ENCODED =>
1028785192,}
> 2012-08-15 19:25:12,270 ERROR org.apache.hadoop.hbase.executor.EventHandler: Caught throwable
while processing event C_M_ENABLE_TABLE
> java.lang.NullPointerException
>         at org.apache.hadoop.hbase.master.handler.EnableTableHandler.handleEnableTable(EnableTableHandler.java:116)
>         at org.apache.hadoop.hbase.master.handler.EnableTableHandler.process(EnableTableHandler.java:97)
>         at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:169)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>         at java.lang.Thread.run(Thread.java:662)
> table is disabled now, then we enable and delete the table at the same time. 
> Since the thread num of MASTER_TABLE_OPERATIONS is 1 by default. The two operations are
serial in master.Before deletetable deletes all the regions in meta, CreateTableHandler ships
the check of tableExists,then it will block until deletetable finishs, then CreateTableHandler
will set zk enabling, and find no data in meta:
>  regionsInMeta = MetaReader.getTableRegions(this.ct, tableName, true);
>  int countOfRegionsInTable = regionsInMeta.size();
> npe will be throwed here. And we could not create the same table anymore.

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