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Date: Thu, 13 Sep 2012 00:05:08 +1100 (NCT)
From: "Michael Drzal (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Updated] (HBASE-6504) Adding GC details prevents HBase from
 starting in non-distributed mode
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     [ https://issues.apache.org/jira/browse/HBASE-6504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Drzal updated HBASE-6504:
---------------------------------

    Assignee: Michael Drzal
    
> 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
>
> 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, 0x0000000751860000)
>   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, 0x00000007f5a00000)
>  concurrent-mark-sweep perm gen total 21248K, used 6994K [0x00000007f5a00000, 0x00000007f6ec0000, 0x0000000800000000)
> $ ./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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