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From Marcelo Elias Del Valle <marc...@s1mbi0se.com.br>
Subject too many open files
Date Fri, 08 Aug 2014 19:35:55 GMT
Hi,

I am using Cassandra 2.0.9 running on Debian Wheezy, and I am having "too
many open files" exceptions when I try to perform a large number of
operations in my 10 node cluster.

I saw the documentation
http://www.datastax.com/documentation/cassandra/2.0/cassandra/troubleshooting/trblshootTooManyFiles_r.html
and I have set everything to the recommended settings, but I keep getting
the errors.

In the documentation it says: "Another, much less likely possibility, is a
file descriptor leak in Cassandra. Run lsof -n | grep java to check that
the number of file descriptors opened by Java is reasonable and reports the
error if the number is greater than a few thousand."

I guess it's not the case, or else a lot of people would be complaining
about it, but I am not sure what I could do to solve the problem.

Any hint about how to solve it?

My client is written in python and uses Cassandra Python Driver. Here are
the exceptions I am having in the client:
[s1log] 2014-08-08 12:16:09,631 - cassandra.pool - WARNING - Error
attempting to reconnect to 200.200.200.151, scheduling retry in 600.0
seconds: [Errno 24] Too many open files
[s1log] 2014-08-08 12:16:09,632 - cassandra.pool - WARNING - Error
attempting to reconnect to 200.200.200.142, scheduling retry in 600.0
seconds: [Errno 24] Too many open files
[s1log] 2014-08-08 12:16:09,633 - cassandra.pool - WARNING - Error
attempting to reconnect to 200.200.200.143, scheduling retry in 600.0
seconds: [Errno 24] Too many open files
[s1log] 2014-08-08 12:16:09,634 - cassandra.pool - WARNING - Error
attempting to reconnect to 200.200.200.142, scheduling retry in 600.0
seconds: [Errno 24] Too many open files
[s1log] 2014-08-08 12:16:09,634 - cassandra.pool - WARNING - Error
attempting to reconnect to 200.200.200.145, scheduling retry in 600.0
seconds: [Errno 24] Too many open files
[s1log] 2014-08-08 12:16:09,635 - cassandra.pool - WARNING - Error
attempting to reconnect to 200.200.200.144, scheduling retry in 600.0
seconds: [Errno 24] Too many open files
[s1log] 2014-08-08 12:16:09,635 - cassandra.pool - WARNING - Error
attempting to reconnect to 200.200.200.148, scheduling retry in 600.0
seconds: [Errno 24] Too many open files
[s1log] 2014-08-08 12:16:09,732 - cassandra.pool - WARNING - Error
attempting to reconnect to 200.200.200.146, scheduling retry in 600.0
seconds: [Errno 24] Too many open files
[s1log] 2014-08-08 12:16:09,733 - cassandra.pool - WARNING - Error
attempting to reconnect to 200.200.200.77, scheduling retry in 600.0
seconds: [Errno 24] Too many open files
[s1log] 2014-08-08 12:16:09,734 - cassandra.pool - WARNING - Error
attempting to reconnect to 200.200.200.76, scheduling retry in 600.0
seconds: [Errno 24] Too many open files
[s1log] 2014-08-08 12:16:09,734 - cassandra.pool - WARNING - Error
attempting to reconnect to 200.200.200.75, scheduling retry in 600.0
seconds: [Errno 24] Too many open files
[s1log] 2014-08-08 12:16:09,735 - cassandra.pool - WARNING - Error
attempting to reconnect to 200.200.200.142, scheduling retry in 600.0
seconds: [Errno 24] Too many open files
[s1log] 2014-08-08 12:16:09,736 - cassandra.pool - WARNING - Error
attempting to reconnect to 200.200.200.185, scheduling retry in 600.0
seconds: [Errno 24] Too many open files
[s1log] 2014-08-08 12:16:09,942 - cassandra.pool - WARNING - Error
attempting to reconnect to 200.200.200.144, scheduling retry in 512.0
seconds: Timed out connecting to 200.200.200.144
[s1log] 2014-08-08 12:16:09,998 - cassandra.pool - WARNING - Error
attempting to reconnect to 200.200.200.77, scheduling retry in 512.0
seconds: Timed out connecting to 200.200.200.77


And here is the exception I am having in the server:

 WARN [Native-Transport-Requests:163] 2014-08-08 14:27:30,499
BatchStatement.java (line 223) Batch of prepared statements for
[identification.entity_lookup, identification.entity] is of size 25216,
exceeding specified threshold of 5120 by 20096.
ERROR [Native-Transport-Requests:150] 2014-08-08 14:27:31,611
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(SocketDispatcher.java:39)
        at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
        at sun.nio.ch.IOUtil.read(IOUtil.java:192)
        at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:375)
        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(ThreadPoolExecutor.java:1142)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)

Here is the amount of open files before and after I restart Cassandra:

root@h:/etc/security/limits.d# lsof -n | grep java | wc -l
936580
root@h:/etc/security/limits.d# sudo service cassandra restart
[ ok ] Restarting Cassandra: cassandra.
root@h:/etc/security/limits.d# lsof -n | grep java | wc -l
80295


Best regards,
Marcelo Valle.

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