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From Jonathan Ellis <>
Subject Re: losing connection to Cassandra
Date Fri, 25 Feb 2011 15:27:31 GMT
You should upgrade before wasting time troubleshooting such an old install.

On Thu, Feb 24, 2011 at 8:45 AM, Tomer B <> wrote:
> Hi
> i'm using a 3 node cluster of cassandra 0.6.1 together with hector as api to
> java client.
> every few days I get a situation where I cannot connect to cassandra, other
> than that the data dir is filling up the whole disk space and the
> synchronization stops at these times, the exceptions I get are as following:
> Happended 3386 in 24H: POOL EXHAUSTED: 02:00:30.225 [MyThread[5]]: Unable to
> connect to cassandra node xxx.xx.xx.32:9160 will try the next node, Pool
> exhausted
> Happened 6848 in 24H CONNECTION REFUSED: 06:14:48.598 [MyThread[4]]: Unable
> to connect to cassandra node xxx.xx.xx.30:9160 will try the next node,
> Unable to open transport to xxx.xx.xx.30:9160 ,
> Connection refused: connect
> Happened 84 times in 24H: NULL OUTPUTSTREAM: 06:14:48.504 [MyThread[2]]:
> async execution fail, Cannot write to null outputStream
> Happened 14 times in 24H: CONNECTION TIMED OUT: 06:15:08.019 [MyThread[0]]:
> Unable to connect to cassandra node xxx.xx.xx.31:9160 will try the next
> node, Unable to open transp ort to xxx.xx.xx.31:9160 ,
> Connection timed out: connect
> Can anyone assist or suggest what could be the problem? note that the node
> is funcioning well and it happens once every few days.

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support

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