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Posted to user@cassandra.apache.org by Philip Ó Condúin <ph...@gmail.com> on 2018/09/18 11:09:06 UTC
jmxterm "#NullPointerException: No such PID "
Hi All,
I need a little advice. I'm trying to access the JMX terminal using
*jmxterm-1.0-alpha-4-uber.jar* with a very simple default install of C*
3.11.3
I keep getting the following:
[cassandra@reaper-1 conf]$ java -jar jmxterm-1.0-alpha-4-uber.jar
Welcome to JMX terminal. Type "help" for available commands.
$>open 1666
*#NullPointerException: No such PID 1666*
$>
C* is running with a PID of 1666. I've tried setting JMX_LOCAL=no and have
even created a new VM to test it.
Does anyone know what I might be doing wrong here?
Kind Regards,
Phil
Re: jmxterm "#NullPointerException: No such PID "
Posted by Chris Lohfink <cl...@gmail.com>.
For what its worth, I highly recommend you remove that option in all
cassandra clusters first thing. A possibly non existent improvement (ie
/tmp on different low throughput drive) vs being able to diagnose issues is
a no brainer. You can measure or monitor gc logs for your safepoint pauses
to see if its ever a significant portion of your GC pauses.
Chris
On Thu, Sep 20, 2018 at 6:05 AM Philip Ó Condúin <ph...@gmail.com>
wrote:
> Thank you Yuki, this explains it.
> I am used to working on C* 2.1 in production where this JVM flag is not
> enabled.
>
>
> On Wed, 19 Sep 2018 at 00:29, Yuki Morishita <mo...@gmail.com> wrote:
>
>> This is because Cassandra sets -XX:+PerfDisableSharedMem JVM option by
>> default.
>> This prevents tools such as jps to list jvm processes.
>> See https://issues.apache.org/jira/browse/CASSANDRA-9242 for detail.
>>
>> You can work around by doing what Riccardo said.
>> On Tue, Sep 18, 2018 at 9:41 PM Philip Ó Condúin
>> <ph...@gmail.com> wrote:
>> >
>> > Hi Riccardo,
>> >
>> > Yes that works for me:
>> >
>> > Welcome to JMX terminal. Type "help" for available commands.
>> > $> open localhost:7199
>> > #Connection to localhost:7199 is opened
>> > $>domains
>> > #following domains are available
>> > JMImplementation
>> > ch.qos.logback.classic
>> > com.sun.management
>> > java.lang
>> > java.nio
>> > java.util.logging
>> > org.apache.cassandra.db
>> > org.apache.cassandra.hints
>> > org.apache.cassandra.internal
>> > org.apache.cassandra.metrics
>> > org.apache.cassandra.net
>> > org.apache.cassandra.request
>> > org.apache.cassandra.service
>> > $>
>> >
>> > I can work with this :-)
>> >
>> > Not sure why the JVM is not listed when issuing the JVMS command, maybe
>> its a server setting, our production servers find the Cass JVM. I've spent
>> half the day trying to figure it out so I think I'll just put it to bed now
>> and work on something else.
>> >
>> > Regards,
>> > Phil
>> >
>> > On Tue, 18 Sep 2018 at 13:34, Riccardo Ferrari <fe...@gmail.com>
>> wrote:
>> >>
>> >> Hi Philip,
>> >>
>> >> I've used jmxterm myself without any problems particular problems. On
>> my systems too, I don't get the cassandra daemon listed when issuing the
>> `jvms` command but I never spent much time investigating it.
>> >> Assuming you have not changed anything relevant in the
>> cassandra-env.sh you can connect using jmxterm by issuing 'open
>> 127.0.0.1:7199'. Would that work for you?
>> >>
>> >> HTH,
>> >>
>> >>
>> >>
>> >> On Tue, Sep 18, 2018 at 2:00 PM, Philip Ó Condúin <
>> philipoconduin@gmail.com> wrote:
>> >>>
>> >>> Further info:
>> >>>
>> >>> I would expect to see the following when I list the jvm's:
>> >>>
>> >>> Welcome to JMX terminal. Type "help" for available commands.
>> >>> $>jvms
>> >>> 25815 (m) - org.apache.cassandra.service.CassandraDaemon
>> >>> 17628 ( ) - jmxterm-1.0-alpha-4-uber.jar
>> >>>
>> >>> But jmxtem is not picking up the JVM for Cassandra for some reason.
>> >>>
>> >>> Can someone point me in the right direction? Is there settings in
>> the cassandra-env.sh file I need to amend to get jmxterm to find the cass
>> jvm?
>> >>>
>> >>> Im not finding much about it on google.
>> >>>
>> >>> Thanks,
>> >>> Phil
>> >>>
>> >>>
>> >>> On Tue, 18 Sep 2018 at 12:09, Philip Ó Condúin <
>> philipoconduin@gmail.com> wrote:
>> >>>>
>> >>>> Hi All,
>> >>>>
>> >>>> I need a little advice. I'm trying to access the JMX terminal using
>> jmxterm-1.0-alpha-4-uber.jar with a very simple default install of C* 3.11.3
>> >>>>
>> >>>> I keep getting the following:
>> >>>>
>> >>>> [cassandra@reaper-1 conf]$ java -jar jmxterm-1.0-alpha-4-uber.jar
>> >>>> Welcome to JMX terminal. Type "help" for available commands.
>> >>>> $>open 1666
>> >>>> #NullPointerException: No such PID 1666
>> >>>> $>
>> >>>>
>> >>>> C* is running with a PID of 1666. I've tried setting JMX_LOCAL=no
>> and have even created a new VM to test it.
>> >>>>
>> >>>> Does anyone know what I might be doing wrong here?
>> >>>>
>> >>>> Kind Regards,
>> >>>> Phil
>> >>>>
>> >>>
>> >>>
>> >>> --
>> >>> Regards,
>> >>> Phil
>> >>
>> >>
>> >
>> >
>> > --
>> > Regards,
>> > Phil
>>
>
>
> --
> Regards,
> Phil
>
Re: jmxterm "#NullPointerException: No such PID "
Posted by Philip Ó Condúin <ph...@gmail.com>.
Thank you Yuki, this explains it.
I am used to working on C* 2.1 in production where this JVM flag is not
enabled.
On Wed, 19 Sep 2018 at 00:29, Yuki Morishita <mo...@gmail.com> wrote:
> This is because Cassandra sets -XX:+PerfDisableSharedMem JVM option by
> default.
> This prevents tools such as jps to list jvm processes.
> See https://issues.apache.org/jira/browse/CASSANDRA-9242 for detail.
>
> You can work around by doing what Riccardo said.
> On Tue, Sep 18, 2018 at 9:41 PM Philip Ó Condúin
> <ph...@gmail.com> wrote:
> >
> > Hi Riccardo,
> >
> > Yes that works for me:
> >
> > Welcome to JMX terminal. Type "help" for available commands.
> > $> open localhost:7199
> > #Connection to localhost:7199 is opened
> > $>domains
> > #following domains are available
> > JMImplementation
> > ch.qos.logback.classic
> > com.sun.management
> > java.lang
> > java.nio
> > java.util.logging
> > org.apache.cassandra.db
> > org.apache.cassandra.hints
> > org.apache.cassandra.internal
> > org.apache.cassandra.metrics
> > org.apache.cassandra.net
> > org.apache.cassandra.request
> > org.apache.cassandra.service
> > $>
> >
> > I can work with this :-)
> >
> > Not sure why the JVM is not listed when issuing the JVMS command, maybe
> its a server setting, our production servers find the Cass JVM. I've spent
> half the day trying to figure it out so I think I'll just put it to bed now
> and work on something else.
> >
> > Regards,
> > Phil
> >
> > On Tue, 18 Sep 2018 at 13:34, Riccardo Ferrari <fe...@gmail.com>
> wrote:
> >>
> >> Hi Philip,
> >>
> >> I've used jmxterm myself without any problems particular problems. On
> my systems too, I don't get the cassandra daemon listed when issuing the
> `jvms` command but I never spent much time investigating it.
> >> Assuming you have not changed anything relevant in the cassandra-env.sh
> you can connect using jmxterm by issuing 'open 127.0.0.1:7199'. Would
> that work for you?
> >>
> >> HTH,
> >>
> >>
> >>
> >> On Tue, Sep 18, 2018 at 2:00 PM, Philip Ó Condúin <
> philipoconduin@gmail.com> wrote:
> >>>
> >>> Further info:
> >>>
> >>> I would expect to see the following when I list the jvm's:
> >>>
> >>> Welcome to JMX terminal. Type "help" for available commands.
> >>> $>jvms
> >>> 25815 (m) - org.apache.cassandra.service.CassandraDaemon
> >>> 17628 ( ) - jmxterm-1.0-alpha-4-uber.jar
> >>>
> >>> But jmxtem is not picking up the JVM for Cassandra for some reason.
> >>>
> >>> Can someone point me in the right direction? Is there settings in the
> cassandra-env.sh file I need to amend to get jmxterm to find the cass jvm?
> >>>
> >>> Im not finding much about it on google.
> >>>
> >>> Thanks,
> >>> Phil
> >>>
> >>>
> >>> On Tue, 18 Sep 2018 at 12:09, Philip Ó Condúin <
> philipoconduin@gmail.com> wrote:
> >>>>
> >>>> Hi All,
> >>>>
> >>>> I need a little advice. I'm trying to access the JMX terminal using
> jmxterm-1.0-alpha-4-uber.jar with a very simple default install of C* 3.11.3
> >>>>
> >>>> I keep getting the following:
> >>>>
> >>>> [cassandra@reaper-1 conf]$ java -jar jmxterm-1.0-alpha-4-uber.jar
> >>>> Welcome to JMX terminal. Type "help" for available commands.
> >>>> $>open 1666
> >>>> #NullPointerException: No such PID 1666
> >>>> $>
> >>>>
> >>>> C* is running with a PID of 1666. I've tried setting JMX_LOCAL=no
> and have even created a new VM to test it.
> >>>>
> >>>> Does anyone know what I might be doing wrong here?
> >>>>
> >>>> Kind Regards,
> >>>> Phil
> >>>>
> >>>
> >>>
> >>> --
> >>> Regards,
> >>> Phil
> >>
> >>
> >
> >
> > --
> > Regards,
> > Phil
>
--
Regards,
Phil
Re: jmxterm "#NullPointerException: No such PID "
Posted by Yuki Morishita <mo...@gmail.com>.
This is because Cassandra sets -XX:+PerfDisableSharedMem JVM option by default.
This prevents tools such as jps to list jvm processes.
See https://issues.apache.org/jira/browse/CASSANDRA-9242 for detail.
You can work around by doing what Riccardo said.
On Tue, Sep 18, 2018 at 9:41 PM Philip Ó Condúin
<ph...@gmail.com> wrote:
>
> Hi Riccardo,
>
> Yes that works for me:
>
> Welcome to JMX terminal. Type "help" for available commands.
> $> open localhost:7199
> #Connection to localhost:7199 is opened
> $>domains
> #following domains are available
> JMImplementation
> ch.qos.logback.classic
> com.sun.management
> java.lang
> java.nio
> java.util.logging
> org.apache.cassandra.db
> org.apache.cassandra.hints
> org.apache.cassandra.internal
> org.apache.cassandra.metrics
> org.apache.cassandra.net
> org.apache.cassandra.request
> org.apache.cassandra.service
> $>
>
> I can work with this :-)
>
> Not sure why the JVM is not listed when issuing the JVMS command, maybe its a server setting, our production servers find the Cass JVM. I've spent half the day trying to figure it out so I think I'll just put it to bed now and work on something else.
>
> Regards,
> Phil
>
> On Tue, 18 Sep 2018 at 13:34, Riccardo Ferrari <fe...@gmail.com> wrote:
>>
>> Hi Philip,
>>
>> I've used jmxterm myself without any problems particular problems. On my systems too, I don't get the cassandra daemon listed when issuing the `jvms` command but I never spent much time investigating it.
>> Assuming you have not changed anything relevant in the cassandra-env.sh you can connect using jmxterm by issuing 'open 127.0.0.1:7199'. Would that work for you?
>>
>> HTH,
>>
>>
>>
>> On Tue, Sep 18, 2018 at 2:00 PM, Philip Ó Condúin <ph...@gmail.com> wrote:
>>>
>>> Further info:
>>>
>>> I would expect to see the following when I list the jvm's:
>>>
>>> Welcome to JMX terminal. Type "help" for available commands.
>>> $>jvms
>>> 25815 (m) - org.apache.cassandra.service.CassandraDaemon
>>> 17628 ( ) - jmxterm-1.0-alpha-4-uber.jar
>>>
>>> But jmxtem is not picking up the JVM for Cassandra for some reason.
>>>
>>> Can someone point me in the right direction? Is there settings in the cassandra-env.sh file I need to amend to get jmxterm to find the cass jvm?
>>>
>>> Im not finding much about it on google.
>>>
>>> Thanks,
>>> Phil
>>>
>>>
>>> On Tue, 18 Sep 2018 at 12:09, Philip Ó Condúin <ph...@gmail.com> wrote:
>>>>
>>>> Hi All,
>>>>
>>>> I need a little advice. I'm trying to access the JMX terminal using jmxterm-1.0-alpha-4-uber.jar with a very simple default install of C* 3.11.3
>>>>
>>>> I keep getting the following:
>>>>
>>>> [cassandra@reaper-1 conf]$ java -jar jmxterm-1.0-alpha-4-uber.jar
>>>> Welcome to JMX terminal. Type "help" for available commands.
>>>> $>open 1666
>>>> #NullPointerException: No such PID 1666
>>>> $>
>>>>
>>>> C* is running with a PID of 1666. I've tried setting JMX_LOCAL=no and have even created a new VM to test it.
>>>>
>>>> Does anyone know what I might be doing wrong here?
>>>>
>>>> Kind Regards,
>>>> Phil
>>>>
>>>
>>>
>>> --
>>> Regards,
>>> Phil
>>
>>
>
>
> --
> Regards,
> Phil
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Re: jmxterm "#NullPointerException: No such PID "
Posted by Philip Ó Condúin <ph...@gmail.com>.
Hi Riccardo,
Yes that works for me:
Welcome to JMX terminal. Type "help" for available commands.
$> open localhost:7199
#Connection to localhost:7199 is opened
$>domains
#following domains are available
JMImplementation
ch.qos.logback.classic
com.sun.management
java.lang
java.nio
java.util.logging
org.apache.cassandra.db
org.apache.cassandra.hints
org.apache.cassandra.internal
org.apache.cassandra.metrics
org.apache.cassandra.net
org.apache.cassandra.request
org.apache.cassandra.service
$>
I can work with this :-)
Not sure why the JVM is not listed when issuing the JVMS command, maybe its
a server setting, our production servers find the Cass JVM. I've spent
half the day trying to figure it out so I think I'll just put it to bed now
and work on something else.
Regards,
Phil
On Tue, 18 Sep 2018 at 13:34, Riccardo Ferrari <fe...@gmail.com> wrote:
> Hi Philip,
>
> I've used jmxterm myself without any problems particular problems. On my
> systems too, I don't get the cassandra daemon listed when issuing the
> `jvms` command but I never spent much time investigating it.
> Assuming you have not changed anything relevant in the cassandra-env.sh
> you can connect using jmxterm by issuing 'open 127.0.0.1:7199'. Would
> that work for you?
>
> HTH,
>
>
>
> On Tue, Sep 18, 2018 at 2:00 PM, Philip Ó Condúin <
> philipoconduin@gmail.com> wrote:
>
>> Further info:
>>
>> I would expect to see the following when I list the jvm's:
>>
>> Welcome to JMX terminal. Type "help" for available commands.
>> $>jvms
>> *25815 (m) - org.apache.cassandra.service.CassandraDaemon*
>> 17628 ( ) - jmxterm-1.0-alpha-4-uber.jar
>>
>> But jmxtem is not picking up the JVM for Cassandra for some reason.
>>
>> Can someone point me in the right direction? Is there settings in the
>> cassandra-env.sh file I need to amend to get jmxterm to find the cass jvm?
>>
>> Im not finding much about it on google.
>>
>> Thanks,
>> Phil
>>
>>
>> On Tue, 18 Sep 2018 at 12:09, Philip Ó Condúin <ph...@gmail.com>
>> wrote:
>>
>>> Hi All,
>>>
>>> I need a little advice. I'm trying to access the JMX terminal using
>>> *jmxterm-1.0-alpha-4-uber.jar* with a very simple default install of C*
>>> 3.11.3
>>>
>>> I keep getting the following:
>>>
>>> [cassandra@reaper-1 conf]$ java -jar jmxterm-1.0-alpha-4-uber.jar
>>> Welcome to JMX terminal. Type "help" for available commands.
>>> $>open 1666
>>> *#NullPointerException: No such PID 1666*
>>> $>
>>>
>>> C* is running with a PID of 1666. I've tried setting JMX_LOCAL=no and
>>> have even created a new VM to test it.
>>>
>>> Does anyone know what I might be doing wrong here?
>>>
>>> Kind Regards,
>>> Phil
>>>
>>>
>>
>> --
>> Regards,
>> Phil
>>
>
>
--
Regards,
Phil
Re: jmxterm "#NullPointerException: No such PID "
Posted by Riccardo Ferrari <fe...@gmail.com>.
Hi Philip,
I've used jmxterm myself without any problems particular problems. On my
systems too, I don't get the cassandra daemon listed when issuing the
`jvms` command but I never spent much time investigating it.
Assuming you have not changed anything relevant in the cassandra-env.sh you
can connect using jmxterm by issuing 'open 127.0.0.1:7199'. Would that work
for you?
HTH,
On Tue, Sep 18, 2018 at 2:00 PM, Philip Ó Condúin <ph...@gmail.com>
wrote:
> Further info:
>
> I would expect to see the following when I list the jvm's:
>
> Welcome to JMX terminal. Type "help" for available commands.
> $>jvms
> *25815 (m) - org.apache.cassandra.service.CassandraDaemon*
> 17628 ( ) - jmxterm-1.0-alpha-4-uber.jar
>
> But jmxtem is not picking up the JVM for Cassandra for some reason.
>
> Can someone point me in the right direction? Is there settings in the
> cassandra-env.sh file I need to amend to get jmxterm to find the cass jvm?
>
> Im not finding much about it on google.
>
> Thanks,
> Phil
>
>
> On Tue, 18 Sep 2018 at 12:09, Philip Ó Condúin <ph...@gmail.com>
> wrote:
>
>> Hi All,
>>
>> I need a little advice. I'm trying to access the JMX terminal using
>> *jmxterm-1.0-alpha-4-uber.jar* with a very simple default install of C*
>> 3.11.3
>>
>> I keep getting the following:
>>
>> [cassandra@reaper-1 conf]$ java -jar jmxterm-1.0-alpha-4-uber.jar
>> Welcome to JMX terminal. Type "help" for available commands.
>> $>open 1666
>> *#NullPointerException: No such PID 1666*
>> $>
>>
>> C* is running with a PID of 1666. I've tried setting JMX_LOCAL=no and
>> have even created a new VM to test it.
>>
>> Does anyone know what I might be doing wrong here?
>>
>> Kind Regards,
>> Phil
>>
>>
>
> --
> Regards,
> Phil
>
Re: jmxterm "#NullPointerException: No such PID "
Posted by Philip Ó Condúin <ph...@gmail.com>.
Further info:
I would expect to see the following when I list the jvm's:
Welcome to JMX terminal. Type "help" for available commands.
$>jvms
*25815 (m) - org.apache.cassandra.service.CassandraDaemon*
17628 ( ) - jmxterm-1.0-alpha-4-uber.jar
But jmxtem is not picking up the JVM for Cassandra for some reason.
Can someone point me in the right direction? Is there settings in the
cassandra-env.sh file I need to amend to get jmxterm to find the cass jvm?
Im not finding much about it on google.
Thanks,
Phil
On Tue, 18 Sep 2018 at 12:09, Philip Ó Condúin <ph...@gmail.com>
wrote:
> Hi All,
>
> I need a little advice. I'm trying to access the JMX terminal using
> *jmxterm-1.0-alpha-4-uber.jar* with a very simple default install of C*
> 3.11.3
>
> I keep getting the following:
>
> [cassandra@reaper-1 conf]$ java -jar jmxterm-1.0-alpha-4-uber.jar
> Welcome to JMX terminal. Type "help" for available commands.
> $>open 1666
> *#NullPointerException: No such PID 1666*
> $>
>
> C* is running with a PID of 1666. I've tried setting JMX_LOCAL=no and
> have even created a new VM to test it.
>
> Does anyone know what I might be doing wrong here?
>
> Kind Regards,
> Phil
>
>
--
Regards,
Phil