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From Josh Elser <>
Subject Re: Accumulo monitor not coming up
Date Sat, 09 Jan 2016 21:29:22 GMT
Assuming this is the case, it may be interesting to you to know that we
changed the default port from 50095 to 9995 in the upcoming Accumulo 1.8.
On Jan 8, 2016 6:45 AM, "Eric Newton" <> wrote:

> It's possible some other process grabbed port 50095, and that is
> preventing the monitor from starting. In future releases, the default port
> for the monitor will be in a lower range to avoid this very problem.
> Try running "netstat -nape | grep 50095".
> This should show you information about network sockets and connections to
> port 50095. The very end of the line will provide process information (pid).
> If you provide your master ".debug" logs, it might help to explain the
> shutdown issues you are experiencing.
> -Eric
> On Fri, Jan 8, 2016 at 5:12 AM, mohit.kaushik <>
> wrote:
>> The Accumulo cluster is working fine(all other processes running) but
>> yesterday I restarted one node on which hadoop datanode, zookeeper node,
>> tserver, monitor were running. I started all the processes again but
>> Monitor did not start. I stoped the cluster and restarted but monitor still
>> did not appear.
>> I have JMX configured for monitor process. Visual vm showing everything
>> like monitor is running.. When I start it again from the master server with
>> command "* ip monitor*" it says monitor is already
>> running with pid.  I can check the process is running with " *ps -ef |
>> grep pid*" But as port 50095 is not running simply I can not access the
>> in browser too. I have checked for the firewalls are stopped.
>> And not only on specific server if I start monitor on other servers the
>> behaviour is exactly same either JMX is configured or not. Logs have no
>> error. I also have checked there is no memory issue.
>> One more strange behaviour noticed, If I stop cluster it does not stop
>> cleanly and I have to press ctrl+c and when I start the cluster after start
>> the login prompt hangs forever and I have open another window and again ssh
>> to master again to work on it.
>> Please suggest, I am using Apache Accumulo 1.7.0.
>> Thanks
>> Mohit Kaushik

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