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From Phil Luckhurst <phil.luckhu...@powerassure.com>
Subject Re: binary protocol server side sockets
Date Fri, 11 Apr 2014 15:16:20 GMT
We have considered this but wondered how well it would work as the Cassandra
Java Driver opens multiple connections internally to each Cassandra node. I
suppose it depends how those connections are used internally, if it's round
robin then it should work. Perhaps we just need to to try it.

--
Thanks
Phil


Chris Lohfink wrote
> TCP keep alives (by the setTimeout) are notoriously useless...  The
> default
> 2 hours is generally far longer then any timeout in NAT translation tables
> (generally ~5 min) and even if you decrease the keep alive to a sane value
> a log of networks actually throw away TCP keep alive packets.  You see
> that
> a lot more in cell networks though.  Its almost always a good idea to have
> a software keep alive although it seems to be not implemented in this
> protocol.  You can make a super simple CF with 1 value and query it every
> minute a connection is idle or something.  i.e. "select * from DummyCF
> where id = 1"
> 
> -- 
> *Chris Lohfink*
> Engineer
> 415.663.6738  |  Skype: clohfink.blackbirdit
> *Blackbird **[image: favicon]*
> 
> 775.345.3485  |  www.blackbirdIT.com &lt;http://www.blackbirdit.com/&gt;
> 
> *"Formerly PalominoDB/DriveDev"*
> 
> 
> On Fri, Apr 11, 2014 at 3:04 AM, Phil Luckhurst <

> phil.luckhurst@

>> wrote:
> 
>> We are also seeing this in our development environment. We have a 3 node
>> Cassandra 2.0.5 cluster running on Ubuntu 12.04 and are connecting from a
>> Tomcat based application running on Windows using the 2.0.0 Cassandra
>> Java
>> Driver. We have setKeepAlive(true) when building the cluster in the
>> application and this does keep one connection open on the client side to
>> each of the 3 Cassandra nodes, but we still see the build up of 'old'
>> ESTABLISHED connections on each of the Cassandra servers.
>>
>> We are also getting that same "Unexpected exception during request"
>> exception appearing in the logs
>>
>> ERROR [Native-Transport-Requests:358378] 2014-04-09 12:31:46,824
>> ErrorMessage.java (line 222) Unexpected exception during request
>> java.io.IOException: Connection reset by peer
>>         at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
>>         at sun.nio.ch.SocketDispatcher.read(Unknown Source)
>>         at sun.nio.ch.IOUtil.readIntoNativeBuffer(Unknown Source)
>>         at sun.nio.ch.IOUtil.read(Unknown Source)
>>         at sun.nio.ch.SocketChannelImpl.read(Unknown Source)
>>         at
>> org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:64)
>>         at
>>
>> org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:109)
>>         at
>>
>> org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:312)
>>         at
>>
>> org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:90)
>>         at
>> org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
>>         at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown
>> Source)
>>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
>> Source)
>>         at java.lang.Thread.run(Unknown Source)
>>
>> Initially we thought this was down to a firewall that is between our
>> development machines and the Cassandra nodes but that has now been
>> configured not to 'kill' any connections on port 9042. We also have the
>> Windows firewall on the client side turned off.
>>
>> We still think this is down to our environment as the same application
>> running in Tomcat hosted on a Ubuntu 12.04 server does not appear to be
>> doing this but up to now we can't track down the cause.
>>
>>
>>
>>
>> --
>> View this message in context:
>> http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/binary-protocol-server-side-sockets-tp7593879p7593937.html
>> Sent from the 

> cassandra-user@.apache

>  mailing list archive at
>> Nabble.com.
>>
> 
> 
> 
> -- 
> *Chris Lohfink*
> Engineer
> 415.663.6738  |  Skype: clohfink.blackbirdit
> 
> *Blackbird **[image: favicon]*
> 
> 775.345.3485  |  www.blackbirdIT.com &lt;http://www.blackbirdit.com/&gt;
> 
> *"Formerly PalominoDB/DriveDev"*
> 
> 
> image001.png (5K)
> &lt;http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/attachment/7593947/0/image001.png&gt;





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