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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4138) If zookeeper.znode.parent is not specifed explicitly in Client code then HTable object loops continuously waiting for the root region by using /hbase as the base node.
Date Fri, 29 Jul 2011 04:52:10 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13072677#comment-13072677
] 

Ted Yu commented on HBASE-4138:
-------------------------------

Test suite timed out:
{code}
Running org.apache.hadoop.hbase.master.TestSplitLogManager
killed.
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Error while executing forked tests.; nested exception is org.apache.maven.surefire.booter.shade.org.codehaus.plexus.util.cli.CommandLineException:
Error while executing external command, process killed.

Process timeout out after 900 seconds
{code}
Running this test manually I saw:
{code}
"main" prio=10 tid=0x0000000049d4c000 nid=0x356 in Object.wait() [0x00000000403bb000]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x00000000e61b9d30> (a org.apache.hadoop.hbase.master.SplitLogManager$TaskBatch)
        at java.lang.Object.wait(Object.java:485)
        at org.apache.hadoop.hbase.master.TestSplitLogManager.testTaskDone(TestSplitLogManager.java:338)
        - locked <0x00000000e61b9d30> (a org.apache.hadoop.hbase.master.SplitLogManager$TaskBatch)
{code}
But this test didn't hang on Jenkins ...

> If zookeeper.znode.parent is not specifed explicitly in Client code then HTable object
loops continuously waiting for the root region by using /hbase as the base node.
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-4138
>                 URL: https://issues.apache.org/jira/browse/HBASE-4138
>             Project: HBase
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 0.90.3
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 0.92.0
>
>         Attachments: HBASE-4138_trunk_1.patch, HBASE-4138_trunk_2.patch, HBASE-4138_trunk_3.patch
>
>
> Change the zookeeper.znode.parent property (default is /hbase).
> Now do not specify this change in the client code.
> Use the HTable Object.
> The HTable is not able to find the root region and keeps continuously looping.
> Find the stack trace:
> ====================
> Object.wait(long) line: not available [native method]		 
> RootRegionTracker(ZooKeeperNodeTracker).blockUntilAvailable(long) line: 122
> RootRegionTracker.waitRootRegionLocation(long) line: 73		 
> HConnectionManager$HConnectionImplementation.locateRegion(byte[],
> byte[], boolean) line: 578
> HConnectionManager$HConnectionImplementation.locateRegion(byte[],
> byte[]) line: 558
> HConnectionManager$HConnectionImplementation.locateRegionInMeta(byte[],
> byte[], byte[], boolean, Object) line: 687
> HConnectionManager$HConnectionImplementation.locateRegion(byte[],
> byte[], boolean) line: 589
> HConnectionManager$HConnectionImplementation.locateRegion(byte[],
> byte[]) line: 558
> HConnectionManager$HConnectionImplementation.locateRegionInMeta(byte[],
> byte[], byte[], boolean, Object) line: 687
> HConnectionManager$HConnectionImplementation.locateRegion(byte[],
> byte[], boolean) line: 593
> HConnectionManager$HConnectionImplementation.locateRegion(byte[],
> byte[]) line: 558
> HTable.<init>(Configuration, byte[]) line: 171		 
> HTable.<init>(Configuration, String) line: 145		 
> HBaseTest.test() line: 45

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