# {New I/O client boss #1-0}) Unexpected exception in the selector loop **URL:** \ **Category:** Elasticsearch\ **Created:** [January 10, 2013, 5:30am UTC](https://discuss.elastic.co/t/new-i-o-client-boss-1-0-unexpected-exception-in-the-selector-loop/10288 "2013-01-10T05:30:54Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Muzy](https://avatars.discourse-cdn.com/v4/letter/m/f4b2a3/32.png) [@Muzy](https://discuss.elastic.co/u/Muzy)\ **Post date:** [January 10, 2013, 5:30am UTC](https://discuss.elastic.co/t/new-i-o-client-boss-1-0-unexpected-exception-in-the-selector-loop/10288/1 "2013-01-10T05:30:54Z")
I am getting some warning in my servers. Like the one which I specified below. I just want to know why I am getting these warn and what is the remedy to recover from it. Does these warn cause any problem? [appuser@greatauk bin]$ [Server:slave-three] 17:10:56,387 WARN [netty.channel.socket.nio.NioClientSocketPipelineSink] (elasticsearch[Madam Slay][transport\_client\_boss][T#1]{New I/O client boss #1-0}) Unexpected exception in the selector loop.: java.nio.channels.CancelledKeyException [Server:slave-three] at sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:73) [rt.jar:1.6.0\_22] [Server:slave-three] at sun.nio.ch.SelectionKeyImpl.readyOps(SelectionKeyImpl.java:87) [rt.jar:1.6.0\_22] [Server:slave-three] at java.nio.channels.SelectionKey.isConnectable(SelectionKey.java:336) [rt.jar:1.6.0\_22] [Server:slave-three] at org.elasticsearch.common.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.processSelectedKeys(NioClientSocketPipelineSink.java:365) [elasticsearch-0.19.9.jar:] [Server:slave-three] at org.elasticsearch.common.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.run(NioClientSocketPipelineSink.java:282) [elasticsearch-0.19.9.jar:] [Server:slave-three] at org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:102) [elasticsearch-0.19.9.jar:] [Server:slave-three] at org.elasticsearch.common.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42) [elasticsearch-0.19.9.jar:] [Server:slave-three] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) [rt.jar:1.6.0\_22] [Server:slave-three] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) [rt.jar:1.6.0\_22] [Server:slave-three] at java.lang.Thread.run(Thread.java:679) [rt.jar:1.6.0\_22] [Server:slave-three] [Server:slave-three] 17:12:36,426 WARN [netty.channel.socket.nio.NioClientSocketPipelineSink] (elasticsearch[Madam Slay][transport\_client\_boss][T#1]{New I/O client boss #1-0}) Unexpected exception in the selector loop.: java.nio.channels.CancelledKeyException [Server:slave-three] at sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:73) [rt.jar:1.6.0\_22] [Server:slave-three] at sun.nio.ch.SelectionKeyImpl.readyOps(SelectionKeyImpl.java:87) [rt.jar:1.6.0\_22] [Server:slave-three] at java.nio.channels.SelectionKey.isConnectable(SelectionKey.java:336) [rt.jar:1.6.0\_22] [Server:slave-three] at org.elasticsearch.common.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.processSelectedKeys(NioClientSocketPipelineSink.java:365) [elasticsearch-0.19.9.jar:] [Server:slave-three] at org.elasticsearch.common.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.run(NioClientSocketPipelineSink.java:282) [elasticsearch-0.19.9.jar:] [Server:slave-three] at org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:102) [elasticsearch-0.19.9.jar:] [Server:slave-three] at org.elasticsearch.common.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42) [elasticsearch-0.19.9.jar:] [Server:slave-three] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) [rt.jar:1.6.0\_22] [Server:slave-three] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) [rt.jar:1.6.0\_22] [Server:slave-three] at java.lang.Thread.run(Thread.java:679) [rt.jar:1.6.0\_22] -- ---
**Author:** ![Igor\_Motov](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/igor_motov/32/45193_2.png) [@Igor\_Motov](https://discuss.elastic.co/u/Igor_Motov)\ **Post date:** [January 14, 2013, 11:12pm UTC](https://discuss.elastic.co/t/new-i-o-client-boss-1-0-unexpected-exception-in-the-selector-loop/10288/2 "2013-01-14T23:12:48Z")
You are probably hitting this issue [https://issues.jboss.org/browse/NETTY-444](https://issues.jboss.org/browse/NETTY-444) . Judging from the error that you posted, you are running quite old version of java. I would suggest upgrading to a newer version. It will improve performance and stability and this error might also disappear. On Thursday, January 10, 2013 12:30:54 AM UTC-5, Muzy wrote: > I am getting some warning in my servers. Like the one which I specified > below. I just want to know why I am getting these warn and what is > the remedy to recover from it. Does these warn cause any problem? > > [appuser@greatauk bin]$ [Server:slave-three] 17:10:56,387 WARN > [netty.channel.socket.nio.NioClientSocketPipelineSink] (elasticsearch[Madam > Slay][transport\_client\_boss][T#1]{New I/O client boss #1-0}) Unexpected > exception in the selector loop.: java.nio.channels.CancelledKeyException > > [Server:slave-three] at > sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:73) > [rt.jar:1.6.0\_22] > > [Server:slave-three] at > sun.nio.ch.SelectionKeyImpl.readyOps(SelectionKeyImpl.java:87) > [rt.jar:1.6.0\_22] > > [Server:slave-three] at > java.nio.channels.SelectionKey.isConnectable(SelectionKey.java:336) > [rt.jar:1.6.0\_22] > > [Server:slave-three] at > org.elasticsearch.common.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.processSelectedKeys(NioClientSocketPipelineSink.java:365) > [elasticsearch-0.19.9.jar:] > > [Server:slave-three] at > org.elasticsearch.common.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.run(NioClientSocketPipelineSink.java:282) > [elasticsearch-0.19.9.jar:] > > [Server:slave-three] at > org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:102) > [elasticsearch-0.19.9.jar:] > > [Server:slave-three] at > org.elasticsearch.common.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42) > [elasticsearch-0.19.9.jar:] > > [Server:slave-three] at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) > [rt.jar:1.6.0\_22] > > [Server:slave-three] at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) > [rt.jar:1.6.0\_22] > > [Server:slave-three] at java.lang.Thread.run(Thread.java:679) > [rt.jar:1.6.0\_22] > > [Server:slave-three] > > [Server:slave-three] 17:12:36,426 WARN > [netty.channel.socket.nio.NioClientSocketPipelineSink] (elasticsearch[Madam > Slay][transport\_client\_boss][T#1]{New I/O client boss #1-0}) Unexpected > exception in the selector loop.: java.nio.channels.CancelledKeyException > > [Server:slave-three] at > sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:73) > [rt.jar:1.6.0\_22] > > [Server:slave-three] at > sun.nio.ch.SelectionKeyImpl.readyOps(SelectionKeyImpl.java:87) > [rt.jar:1.6.0\_22] > > [Server:slave-three] at > java.nio.channels.SelectionKey.isConnectable(SelectionKey.java:336) > [rt.jar:1.6.0\_22] > > [Server:slave-three] at > org.elasticsearch.common.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.processSelectedKeys(NioClientSocketPipelineSink.java:365) > [elasticsearch-0.19.9.jar:] > > [Server:slave-three] at > org.elasticsearch.common.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.run(NioClientSocketPipelineSink.java:282) > [elasticsearch-0.19.9.jar:] > > [Server:slave-three] at > org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:102) > [elasticsearch-0.19.9.jar:] > > [Server:slave-three] at > org.elasticsearch.common.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42) > [elasticsearch-0.19.9.jar:] > > [Server:slave-three] at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) > [rt.jar:1.6.0\_22] > > [Server:slave-three] at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) > [rt.jar:1.6.0\_22] > > [Server:slave-three] at java.lang.Thread.run(Thread.java:679) > [rt.jar:1.6.0\_22] -- ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 2:56am UTC](https://discuss.elastic.co/t/new-i-o-client-boss-1-0-unexpected-exception-in-the-selector-loop/10288/3 "2017-07-06T02:56:32Z")