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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6504) Adding GC details prevents HBase from starting in non-distributed mode
Date Fri, 14 Sep 2012 22:08:09 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13456190#comment-13456190

Hadoop QA commented on HBASE-6504:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision .

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

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    +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 patch appears to cause mvn compile goal to fail.

    -1 findbugs.  The patch appears to cause Findbugs (version 1.3.9) to fail.

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

     -1 core tests.  The patch failed these unit tests:

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/2875//testReport/
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/2875//console

This message is automatically generated.
> Adding GC details prevents HBase from starting in non-distributed mode
> ----------------------------------------------------------------------
>                 Key: HBASE-6504
>                 URL: https://issues.apache.org/jira/browse/HBASE-6504
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.94.0
>            Reporter: Benoit Sigoure
>            Assignee: Michael Drzal
>            Priority: Trivial
>              Labels: noob
>         Attachments: HBASE-6504-output.txt, HBASE-6504.patch, HBASE-6504-v2.patch
> The {{conf/hbase-env.sh}} that ships with HBase contains a few commented out examples
of variables that could be useful, such as adding {{-XX:+PrintGCDetails -XX:+PrintGCDateStamps}}
to {{HBASE_OPTS}}.  This has the annoying side effect that the JVM prints a summary of memory
usage when it exits, and it does so on stdout:
> {code}
> $ ./bin/hbase org.apache.hadoop.hbase.util.HBaseConfTool hbase.cluster.distributed
> false
> Heap
>  par new generation   total 19136K, used 4908K [0x000000073a200000, 0x000000073b6c0000,
>   eden space 17024K,  28% used [0x000000073a200000, 0x000000073a6cb0a8, 0x000000073b2a0000)
>   from space 2112K,   0% used [0x000000073b2a0000, 0x000000073b2a0000, 0x000000073b4b0000)
>   to   space 2112K,   0% used [0x000000073b4b0000, 0x000000073b4b0000, 0x000000073b6c0000)
>  concurrent mark-sweep generation total 63872K, used 0K [0x0000000751860000, 0x00000007556c0000,
>  concurrent-mark-sweep perm gen total 21248K, used 6994K [0x00000007f5a00000, 0x00000007f6ec0000,
> $ ./bin/hbase org.apache.hadoop.hbase.util.HBaseConfTool hbase.cluster.distributed >/dev/null
> (nothing printed)
> {code}
> And this confuses {{bin/start-hbase.sh}} when it does
> {{distMode=`$bin/hbase --config "$HBASE_CONF_DIR" org.apache.hadoop.hbase.util.HBaseConfTool
hbase.cluster.distributed`}}, because then the {{distMode}} variable is not just set to {{false}},
it also contains all this JVM spam.
> If you don't pay enough attention and realize that 3 processes are getting started (ZK,
HM, RS) instead of just one (HM), then you end up with this confusing error message:
> {{Could not start ZK at requested port of 2181.  ZK was started at port: 2182.  Aborting
as clients (e.g. shell) will not be able to find this ZK quorum.}}, which is even more puzzling
because when you run {{netstat}} to see who owns that port, then you won't find any rogue
process other than the one you just started.
> I'm wondering if the fix is not to just change the {{if [ "$distMode" == 'false' ]}}
to a {{switch $distMode case (false*)}} type of test, to work around this annoying JVM misfeature
that pollutes stdout.

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