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https://issues.apache.org/jira/browse/ZOOKEEPER-2910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17730029#comment-17730029
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Andor Molnar commented on ZOOKEEPER-2910:
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{quote}It can be a JMX port. You can run with JMXDISABLE=1 to see if the extra
port occupation disappears.
{quote}
Confirmed on branch-3.5 as well. The port is a random port opened for remote
JMX and can be disabled by setting JMXDISABLE something other than 'false'.
See more details in bin/zkServer.sh.
> zookeeper listening on unknown random port
> ------------------------------------------
>
> Key: ZOOKEEPER-2910
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2910
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.4.8
> Environment: CentOS 7
> Zookeeper 3.4.8
> JDK 1.8.0_111
> Reporter: ken huang
> Assignee: Patrick D. Hunt
> Priority: Major
>
> when zookeeper start, it will listen on three port:
> 2181 for client connnect
> 3888 for leader election
> random for what ?
> three are three port config in zoo.cfg, 2181、2888、3888, but no 2888 listened
> on.
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