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https://issues.apache.org/jira/browse/HBASE-6504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Drzal updated HBASE-6504:
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Attachment: HBASE-6504-output.txt
Shows output with/without gc args
> 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
>
>
> 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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