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From Philip Smith <philip_sm...@apple.com>
Subject Re: Healthcheck using the stat command
Date Mon, 23 Jan 2012 21:51:36 GMT
There is a batch java program that does a health check:

validateZookeeperService.validateZookeeperService()


which basically runs the ruok command. You could run the stat command and parse out the response
but I think 99% of what you want could be simply looking for 'imok' in the response to the
ruok command.

philip_smith@st11p00td-devlog001:~ 2 $ alias zkok
alias zkok='for idx in 1 2 3 4 5 ; do export zkserver="st11p00td-zookeeper00${idx}" ; echo
"$zkserver $( echo ruok | nc  $zkserver 2181 )" ; done'
philip_smith@st11p00td-devlog001:~ 3 $ zkok
st11p00td-zookeeper001 imok
st11p00td-zookeeper002 imok
st11p00td-zookeeper003 imok
st11p00td-zookeeper004 imok
st11p00td-zookeeper005 imok
philip_smith@st11p00td-devlog001:~ 4 $ 


On Jan 23, 2012, at 1:45 PM, Natarajan Suresh wrote:

> I am trying to write a small health check script for the zookeeper instances. The "stat"
command gives me an output like this:
> ===========================Zookeeper version: 3.3.3-1073969, built on 02/23/2011 22:27
GMTClients: /127.0.0.1:38929[0](queued=0,recved=1,sent=0) /17.155.7.152:37603[1](queued=0,recved=474752,sent=474752)
> Latency min/avg/max: 0/0/35Received: 1113675Sent: 1113706Outstanding: 0Zxid: 0x2000e2925Mode:
followerNode count: 71===========================
> How do I know that the server is ok ? I do not have a bad instance with me to checkout
what the output will be in that case.
> If anyone has already written a health check script, can you please share with me ?
> Thanks
> |Suresh|


Regards, Philip

Philip Smith
Senior Software Engineer
philip_smith@apple.com
408 862-1360 office
530 574-1659 mobile


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