# Exception caught on netty layer **URL:** \ **Category:** Elasticsearch\ **Created:** [December 5, 2012, 8:13am UTC](https://discuss.elastic.co/t/exception-caught-on-netty-layer/9948 "2012-12-05T08:13:54Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![T\_Vinod\_Gupta](https://avatars.discourse-cdn.com/v4/letter/t/fbc32d/32.png) [@T\_Vinod\_Gupta](https://discuss.elastic.co/u/T_Vinod_Gupta)\ **Post date:** [December 5, 2012, 8:13am UTC](https://discuss.elastic.co/t/exception-caught-on-netty-layer/9948/1 "2012-12-05T08:13:54Z")
hi, has anyone seen the below exception in ES log files.. im seeing this and i dont know the reason why.. for the most part, things are working fine though. thanks [2012-12-05 08:09:38,496][WARN][transport.netty] [Norrin Radd] Exception caught on netty layer [[id: 0x79b2591c]] java.net.NoRouteToHostException: No route to host at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:592) at org.elasticsearch.common.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.connect(NioClientSocketPipelineSink.java:401) at org.elasticsearch.common.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.processSelectedKeys(NioClientSocketPipelineSink.java:370) at org.elasticsearch.common.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.run(NioClientSocketPipelineSink.java:292) at org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108) at org.elasticsearch.common.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:44) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:636) -- ---
**Author:** ![radu\_gheorghe](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/radu_gheorghe/32/556_2.png) [@radu\_gheorghe](https://discuss.elastic.co/u/radu_gheorghe)\ **Post date:** [December 5, 2012, 10:26am UTC](https://discuss.elastic.co/t/exception-caught-on-netty-layer/9948/2 "2012-12-05T10:26:08Z")
Hello, I guess there's a communication issue between your nodes. Which makes sense in the context of your other thread (with the yellow and green status on different nodes). As Ivan pointed out there, you probably ended up with two clusters with the same name, even though you only intend to have one. You can avoid this "split brain" situation if you set zen.discovery.minimum\_master\_nodes to a value higher than half the total number of master-eligible nodes in your cluster. Take a look here for details: [https://github.com/elasticsearch/elasticsearch/issues/1079](https://github.com/elasticsearch/elasticsearch/issues/1079) ## Best regards, Radu [http://sematext.com/](http://sematext.com/) -- Elasticsearch -- Solr -- Lucene On Wed, Dec 5, 2012 at 10:13 AM, T Vinod Gupta [tvinod@readypulse.com](mailto:tvinod@readypulse.com)wrote: > hi, has anyone seen the below exception in ES log files.. im seeing this > and i dont know the reason why.. for the most part, things are working fine > though. > > thanks > > [2012-12-05 08:09:38,496][WARN][transport.netty] [Norrin Radd] > Exception caught on netty layer [[id: 0x79b2591c]] > java.net.NoRouteToHostException: No route to host > at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) > at > sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:592) > at > org.elasticsearch.common.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.connect(NioClientSocketPipelineSink.java:401) > at > org.elasticsearch.common.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.processSelectedKeys(NioClientSocketPipelineSink.java:370) > at > org.elasticsearch.common.netty.channel.socket.nio.NioClientSocketPipelineSink$Boss.run(NioClientSocketPipelineSink.java:292) > at > org.elasticsearch.common.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108) > at > org.elasticsearch.common.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:44) > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) > at java.lang.Thread.run(Thread.java:636) > > -- -- ---
**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, 3:01am UTC](https://discuss.elastic.co/t/exception-caught-on-netty-layer/9948/3 "2017-07-06T03:01:22Z")