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From "Marcus Eriksson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10834) jmx_test.py:TestJMX.test_compactionstats flapping when Jolokia fails to connect
Date Wed, 09 Dec 2015 17:20:11 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10834?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15049000#comment-15049000
] 

Marcus Eriksson commented on CASSANDRA-10834:
---------------------------------------------

Has this happened after the fix in CASSANDRA-10666 went in? I would suspect that cassandra
was simply overloaded and refused jmx connections before the fix

> jmx_test.py:TestJMX.test_compactionstats flapping when Jolokia fails to connect
> -------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-10834
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10834
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Jim Witschey
>
> {{jmx_test.py:TestJMX.test_compactionstats}} flaps in a number of jobs on CassCI, including
the 3.0 and trunk jobs:
> http://cassci.datastax.com/job/cassandra-3.0_dtest/335/testReport/junit/jmx_test/TestJMX/test_compactionstats/history/
> http://cassci.datastax.com/job/trunk_dtest/820/testReport/jmx_test/TestJMX/test_compactionstats/history/
> There may be other jobs and other tests that flap this way; I'll update this ticket as
appropriate if I find more information.
> The error printed by the test is
> {code}
> Failed to start jolokia agent (command was: /usr/lib/jvm/jdk1.8.0_45/bin/java -cp /usr/lib/jvm/jdk1.8.0_45/lib/tools.jar:lib/jolokia-jvm-1.2.3-agent.jar
org.jolokia.jvmagent.client.AgentLauncher --host 127.0.0.1 start 17785): Command '('/usr/lib/jvm/jdk1.8.0_45/bin/java',
'-cp', '/usr/lib/jvm/jdk1.8.0_45/lib/tools.jar:lib/jolokia-jvm-1.2.3-agent.jar', 'org.jolokia.jvmagent.client.AgentLauncher',
'--host', '127.0.0.1', 'start', '17785')' returned non-zero exit status 1
> Exit status was: 1
> Output was: Illegal Argument (command: start) : Cannot attach to process-ID 17785.
> See --help for possible reasons.
> {code}
> Which is not very helpful. However, that message is consistent with the one found in
the error that led to us filing this ticket:
> https://github.com/rhuss/jolokia/issues/198
> So, one starting point for debugging should should be to check that shared memory is
correctly disabled when launching Cassandra.
> This was originally reported as CASSANDRA-10666, but that got derailed when an OOM error
cropped up on the same test.



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