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From Shane Hansen <shanemhan...@gmail.com>
Subject Re: too many open files
Date Fri, 08 Aug 2014 20:06:00 GMT
Are you using apache or Datastax cassandra?

The datastax distribution ups the file handle limit to 100000. That
number's hard to exceed.



On Fri, Aug 8, 2014 at 1:35 PM, Marcelo Elias Del Valle <
marcelo@s1mbi0se.com.br> wrote:

> 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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