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Date: Wed, 6 Oct 2010 20:53:23 -0500
Message-ID: <AANLkTimPMLRHG8GmbeH35WgXzPpUxeiR=J6TUmz5tiYu@mail.gmail.com>
Subject: Re: Newbie Question about restarting Cassandra
From: Matthew Dennis <mdennis@riptano.com>
To: user@cassandra.apache.org
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Rob is correct.

drain is really on there for when you need the commit log to be empty (some
upgrades or a complete backup of a shutdown cluster).

There really is no point to using to shutdown C* normally, just kill it...

On Wed, Oct 6, 2010 at 4:18 PM, Rob Coli <rcoli@digg.com> wrote:

> On 10/6/10 1:13 PM, Aaron Morton wrote:
>
>> To shutdown cleanly, say in a production system, use nodetool drain
>> first. This will flush the memtables and put the node into a read only
>> mode, AFAIK this also gives the other nodes a faster way of detecting
>> the node is down via the drained node gossiping it's new status. Then
>> kill.
>>
>
> FWIW, the gossiper related code for "drain" (trunk) looks like it just
> stops the gossip service, which is almost certainly the same thing that
> happens if you kill Cassandra.
>
> ./src/java/org/apache/cassandra/service/StorageService.java
> "
>    public synchronized void drain() throws IOException,
> InterruptedException, ExecutionException
> ...
>  setMode("Starting drain process", true);
>        Gossiper.instance.stop();
> "
>
> ./src/java/org/apache/cassandra/gms/Gossiper.java
> "
>  public void stop()
>    {
>        scheduledGossipTask.cancel(false);
>    }
> "
>
> =Rob
>



-- 
Riptano
Software and Support for Apache Cassandra
http://www.riptano.com/
mdennis@riptano.com
m: 512.587.0900 f: 866.583.2068

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Rob is correct.<br><br>drain is really on there for when you need the commi=
t log to be empty (some upgrades or a complete backup of a shutdown cluster=
).<br><br>There really is no point to using to shutdown C* normally, just k=
ill it...<br>
<br><div class=3D"gmail_quote">On Wed, Oct 6, 2010 at 4:18 PM, Rob Coli <sp=
an dir=3D"ltr">&lt;<a href=3D"mailto:rcoli@digg.com">rcoli@digg.com</a>&gt;=
</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin: 0pt 0p=
t 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"=
>
<div class=3D"im">On 10/6/10 1:13 PM, Aaron Morton wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0.8ex; borde=
r-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
To shutdown cleanly, say in a production system, use nodetool drain<br>
first. This will flush the memtables and put the node into a read only<br>
mode, AFAIK this also gives the other nodes a faster way of detecting<br>
the node is down via the drained node gossiping it&#39;s new status. Then k=
ill.<br>
</blockquote>
<br></div>
FWIW, the gossiper related code for &quot;drain&quot; (trunk) looks like it=
 just stops the gossip service, which is almost certainly the same thing th=
at happens if you kill Cassandra.<br>
<br>
./src/java/org/apache/cassandra/service/StorageService.java<br>
&quot;<br>
 =A0 =A0public synchronized void drain() throws IOException, InterruptedExc=
eption, ExecutionException<br>
...<br>
 =A0setMode(&quot;Starting drain process&quot;, true);<br>
 =A0 =A0 =A0 =A0Gossiper.instance.stop();<br>
&quot;<br>
<br>
./src/java/org/apache/cassandra/gms/Gossiper.java<br>
&quot;<br>
 =A0public void stop()<br>
 =A0 =A0{<br>
 =A0 =A0 =A0 =A0scheduledGossipTask.cancel(false);<br>
 =A0 =A0}<br>
&quot;<br><font color=3D"#888888">
<br>
=3DRob<br>
</font></blockquote></div><br><br clear=3D"all"><br>-- <br>Riptano<br>Softw=
are and Support for Apache Cassandra<br><a href=3D"http://www.riptano.com/"=
 target=3D"_blank">http://www.riptano.com/</a><br><a href=3D"mailto:mdennis=
@riptano.com" target=3D"_blank">mdennis@riptano.com</a><br>
m: 512.587.0900 f: 866.583.2068<br>

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