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Date: Tue, 23 Feb 2016 16:35:37 +0000 (UTC)
From: Anuj Wadehra <anujw_2003@yahoo.co.in>
To: "user@cassandra.apache.org" <user@cassandra.apache.org>,
	Debraj Manna <subharaj.manna@gmail.com>,
	"user@cassandra.apache.org" <user@cassandra.apache.org>
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Subject: Re: Restart Cassandra automatically
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Hi Subharaj,
Cassandra is built to be a Fault tolerant distributed db and suitable for building HA systems. As Cassandra provides multiple replicas for the same data, if a single nide goes down in Production, it wont bring down the cluster.
In my opinion, if you target to start one or more failed Cassandra nodes without investigating the issue, you can damage system health rather than preserve it.
Please set RF amd CL appropriately to ensure that system can afford node failures.
ThanksAnuj

Sent from Yahoo Mail on Android 
 
  On Fri, 5 Feb, 2016 at 9:56 am, Debraj Manna<subharaj.manna@gmail.com> wrote:   Hi,


What is the best way to keep cassandra running? My requirement is if for some reason cassandra stops then it should get started automatically. 

I tried to achieve this by adding cassandra to supervisord. My supervisor conf for cassandra looks like below:-
[program:cassandra]
command=/bin/bash -c 'sleep 10 && bin/cassandra'
directory=/opt/cassandra/
autostart=true
autorestart=true
startretries=3
stderr_logfile=/var/log/cassandra_supervisor.err.log
stdout_logfile=/var/log/cassandra_supervisor.out.log

But it does not seem to work properly. Even if I stop cassandra from 
supervisor then the cassandra process seem to be running if I do 
ps -ef | grep cassandra


I also tried the configuration mentioned in this question but still no luck.

Can someone let me know what is the best way to keep cassandra running on production environment?
Environment
   
   - Cassandra 2.2.4
   - Debian 8

Thanks,


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Hi Subharaj,<div id=3D"yMail_cursorElementTracker_0.5049848896451294"><br>C=
assandra is built to be a Fault tolerant distributed db and suitable for bu=
ilding HA systems. As Cassandra provides multiple replicas for the same dat=
a, if a single nide goes down in Production, it wont bring down the cluster=
.</div><div id=3D"yMail_cursorElementTracker_0.5049848896451294"><br></div>=
<div id=3D"yMail_cursorElementTracker_0.5049848896451294">In my opinion, if=
 you target to start one or more failed Cassandra nodes without investigati=
ng the issue, you can damage system health rather than preserve it.</div><d=
iv id=3D"yMail_cursorElementTracker_0.5049848896451294"><br></div><div id=
=3D"yMail_cursorElementTracker_0.5049848896451294">Please set RF amd CL app=
ropriately to ensure that system can afford node failures.</div><div id=3D"=
yMail_cursorElementTracker_0.5049848896451294"><br></div><div id=3D"yMail_c=
ursorElementTracker_0.5049848896451294">Thanks</div><div id=3D"yMail_cursor=
ElementTracker_0.5049848896451294">Anuj</div><div id=3D"yMail_cursorElement=
Tracker_0.5049848896451294"><br></div><div id=3D"yMail_cursorElementTracker=
_0.5049848896451294"><br><div><a href=3D"https://overview.mail.yahoo.com/mo=
bile/?.src=3DAndroid">Sent from Yahoo Mail on Android</a></div> <br> <block=
quote style=3D"margin: 0 0 20px 0;"> <header style=3D"font-family:Roboto, s=
ans-serif; color:#6D00F6;"> <div>On Fri, 5 Feb, 2016 at 9:56 am, Debraj Man=
na</div><div>&lt;subharaj.manna@gmail.com&gt; wrote:</div> </header> <div s=
tyle=3D"padding: 10px 0 0 20px; margin: 10px 0 0 0; border-left: 1px solid =
#6D00F6;"> <div dir=3D"ltr">Hi,<br><br><p>What is the best way to keep cass=
andra running? My requirement is if=20
for some reason cassandra stops then it should get started=20
automatically. </p>

<p id=3D"yMail_cursorElementTracker_0.9173843911848962">I tried to achieve =
this by adding cassandra to supervisord. My supervisor conf for cassandra l=
ooks like below:-</p><pre><code>[program:cassandra]
command=3D/bin/bash -c 'sleep 10 &amp;&amp; bin/cassandra'
directory=3D/opt/cassandra/
autostart=3Dtrue
autorestart=3Dtrue
startretries=3D3
stderr_logfile=3D/var/log/cassandra_supervisor.err.log
stdout_logfile=3D/var/log/cassandra_supervisor.out.log<br><br></code><span =
style=3D"font-family:arial, helvetica, sans-serif;">But it does not seem to=
 work properly. Even if I stop cassandra from=20
supervisor then the cassandra process seem to be running if I do <br></span=
></pre><pre><code>ps -ef | grep cassandra<br><br></code></pre><p>I also tri=
ed the configuration mentioned in this <a rel=3D"nofollow" target=3D"_blank=
" href=3D"http://stackoverflow.com/questions/33442911/cassandra-is-not-moni=
tored-correctly-by-supervisor?rq=3D1">question</a> but still no luck.</p>

<p>Can someone let me know what is the best way to keep cassandra running o=
n production environment?</p>

Environment<br><ul><li>Cassandra 2.2.4</li><li>Debian 8</li></ul><p>Thanks,=
<br></p><pre><br></pre><br></div> </div> </blockquote></div>
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