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 <rc...@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
>
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