# Unicast Problems (no handler found for action \[discovery/zen/unicast\])
**URL:** https://discuss.elastic.co/t/unicast-problems-no-handler-found-for-action-discovery-zen-unicast/2974
**Category:** Elasticsearch
**Created:** [May 26, 2010, 2:32am UTC](https://discuss.elastic.co/t/unicast-problems-no-handler-found-for-action-discovery-zen-unicast/2974 "2010-05-26T02:32:57Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Marc\_Seeger](https://discuss.elastic.co/u/Marc_Seeger)
#### Post date: [May 26, 2010, 2:32am UTC](https://discuss.elastic.co/t/unicast-problems-no-handler-found-for-action-discovery-zen-unicast/2974/1 "2010-05-26T02:32:57Z")
I'm trying to get the cluster working on EC2 (without the cloud
plugin).
1. I start server A
2. I put the elastic ip of server A in server B's config file (in the
unicast options)
discovery.zen.ping.multicast:
enabled: false
discovery.zen.ping.unicast:
hosts: ["[ec2-xxx-xx-xx-xxx.compute-1.amazonaws.com:9300](http://ec2-xxx-xx-xx-xxx.compute-1.amazonaws.com:9300)"]
1. I start server B
2. server B tries to connect to server A and disaplys a a null pointer
exception:
[02:30:49,691][WARN][discovery.zen.ping.unicast] [Mad Thinker] Failed
to send ping to [[#zen\_unicast\_1#][inet[ec2-xxx-xx-xx-
[xxx.compute-1.amazonaws.com/10.xxx.xxx.xxx:9301](http://xxx.compute-1.amazonaws.com/10.xxx.xxx.xxx:9301)]]]
org.elasticsearch.transport.RemoteTransportException: [Sergei
Kravinoff][inet[/10.xxx.xxx.xxx:9301]][discovery/zen/unicast]
Caused by: java.lang.NullPointerException
at
org.elasticsearch.transport.netty.MessageChannelHandler.handleRequest(MessageChannelHandler.java:
169)
at
org.elasticsearch.transport.netty.MessageChannelHandler.messageReceived(MessageChannelHandler.java:
80)
at
org.elasticsearch.util.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:
80)
at
org.elasticsearch.util.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:
545)
at org.elasticsearch.util.netty.channel.DefaultChannelPipeline
$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:
754)
at
org.elasticsearch.util.netty.channel.Channels.fireMessageReceived(Channels.java:
302)
at
org.elasticsearch.util.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:
317)
at
org.elasticsearch.util.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:
299)
at
org.elasticsearch.util.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:
216)
at
org.elasticsearch.util.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:
80)
at
org.elasticsearch.util.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:
545)
at org.elasticsearch.util.netty.channel.DefaultChannelPipeline
$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:
754)
at
org.elasticsearch.transport.netty.OpenChannelsHandler.handleUpstream(OpenChannelsHandler.java:
51)
at
org.elasticsearch.util.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:
545)
at
org.elasticsearch.util.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:
540)
at
org.elasticsearch.util.netty.channel.Channels.fireMessageReceived(Channels.java:
274)
at
org.elasticsearch.util.netty.channel.Channels.fireMessageReceived(Channels.java:
261)
at
org.elasticsearch.util.netty.channel.socket.nio.NioWorker.read(NioWorker.java:
340)
at
org.elasticsearch.util.netty.channel.socket.nio.NioWorker.processSelectedKeys(NioWorker.java:
272)
at
org.elasticsearch.util.netty.channel.socket.nio.NioWorker.run(NioWorker.java:
192)
at
org.elasticsearch.util.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:
108)
at
org.elasticsearch.util.netty.util.internal.IoWorkerRunnable.run(IoWorkerRunnable.java:
46)
at java.util.concurrent.ThreadPoolExecutor
$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor
$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Server A displays:
[02:30:46,813][WARN][transport.netty] [Sergei Kravinoff] No
handler found for action [discovery/zen/unicast]
[02:30:46,936][WARN][transport.netty] [Sergei Kravinoff]
Message not fully read for [0] and handler null, resetting
Is there anything I'm missing?
Thanks,
Marc
---
### Author:  [@Marc\_Seeger](https://discuss.elastic.co/u/Marc_Seeger)
#### Post date: [May 26, 2010, 2:33am UTC](https://discuss.elastic.co/t/unicast-problems-no-handler-found-for-action-discovery-zen-unicast/2974/2 "2010-05-26T02:33:47Z")
In the initial config, the port is the same as in the error messages
(3001)
On May 26, 4:32 am, Marc Seeger [m...@marc-seeger.de](mailto:m...@marc-seeger.de) wrote:
> I'm trying to get the cluster working on EC2 (without the cloud
> plugin).
>
> 1. I start server A
> 2. I put the elastic ip of server A in server B's config file (in the
> unicast options)
>
> discovery.zen.ping.multicast:
> enabled: false
>
> discovery.zen.ping.unicast:
> hosts: ["[ec2-xxx-xx-xx-xxx.compute-1.amazonaws.com:9300](http://ec2-xxx-xx-xx-xxx.compute-1.amazonaws.com:9300)"]
>
> 1. I start server B
> 2. server B tries to connect to server A and disaplys a a null pointer
> exception:
>
> [02:30:49,691][WARN][discovery.zen.ping.unicast] [Mad Thinker] Failed
> to send ping to [[#zen\_unicast\_1#][inet[ec2-xxx-xx-xx-
> [xxx.compute-1.amazonaws.com/10.xxx.xxx.xxx:9301](http://xxx.compute-1.amazonaws.com/10.xxx.xxx.xxx:9301)]]]
> org.elasticsearch.transport.RemoteTransportException: [Sergei
> Kravinoff][inet[/10.xxx.xxx.xxx:9301]][discovery/zen/unicast]
> Caused by: java.lang.NullPointerException
> at
> org.elasticsearch.transport.netty.MessageChannelHandler.handleRequest(Messa geChannelHandler.java:
> 169)
> at
> org.elasticsearch.transport.netty.MessageChannelHandler.messageReceived(Mes sageChannelHandler.java:
> 80)
> at
> org.elasticsearch.util.netty.channel.SimpleChannelUpstreamHandler.handleUps tream(SimpleChannelUpstreamHandler.java:
> 80)
> at
> org.elasticsearch.util.netty.channel.DefaultChannelPipeline.sendUpstream(De faultChannelPipeline.java:
> 545)
> at org.elasticsearch.util.netty.channel.DefaultChannelPipeline
> $DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:
> 754)
> at
> org.elasticsearch.util.netty.channel.Channels.fireMessageReceived(Channels. java:
> 302)
> at
> org.elasticsearch.util.netty.handler.codec.frame.FrameDecoder.unfoldAndFire MessageReceived(FrameDecoder.java:
> 317)
> at
> org.elasticsearch.util.netty.handler.codec.frame.FrameDecoder.callDecode(Fr ameDecoder.java:
> 299)
> at
> org.elasticsearch.util.netty.handler.codec.frame.FrameDecoder.messageReceiv ed(FrameDecoder.java:
> 216)
> at
> org.elasticsearch.util.netty.channel.SimpleChannelUpstreamHandler.handleUps tream(SimpleChannelUpstreamHandler.java:
> 80)
> at
> org.elasticsearch.util.netty.channel.DefaultChannelPipeline.sendUpstream(De faultChannelPipeline.java:
> 545)
> at org.elasticsearch.util.netty.channel.DefaultChannelPipeline
> $DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:
> 754)
> at
> org.elasticsearch.transport.netty.OpenChannelsHandler.handleUpstream(OpenCh annelsHandler.java:
> 51)
> at
> org.elasticsearch.util.netty.channel.DefaultChannelPipeline.sendUpstream(De faultChannelPipeline.java:
> 545)
> at
> org.elasticsearch.util.netty.channel.DefaultChannelPipeline.sendUpstream(De faultChannelPipeline.java:
> 540)
> at
> org.elasticsearch.util.netty.channel.Channels.fireMessageReceived(Channels. java:
> 274)
> at
> org.elasticsearch.util.netty.channel.Channels.fireMessageReceived(Channels. java:
> 261)
> at
> org.elasticsearch.util.netty.channel.socket.nio.NioWorker.read(NioWorker.ja va:
> 340)
> at
> org.elasticsearch.util.netty.channel.socket.nio.NioWorker.processSelectedKe ys(NioWorker.java:
> 272)
> at
> org.elasticsearch.util.netty.channel.socket.nio.NioWorker.run(NioWorker.jav a:
> 192)
> at
> org.elasticsearch.util.netty.util.ThreadRenamingRunnable.run(ThreadRenaming Runnable.java:
> 108)
> at
> org.elasticsearch.util.netty.util.internal.IoWorkerRunnable.run(IoWorkerRun nable.java:
> 46)
> at java.util.concurrent.ThreadPoolExecutor
> $Worker.runTask(ThreadPoolExecutor.java:886)
> at java.util.concurrent.ThreadPoolExecutor
> $Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:619)
>
> Server A displays:
> [02:30:46,813][WARN][transport.netty] [Sergei Kravinoff] No
> handler found for action [discovery/zen/unicast]
> [02:30:46,936][WARN][transport.netty] [Sergei Kravinoff]
> Message not fully read for [0] and handler null, resetting
>
> Is there anything I'm missing?
>
> Thanks,
> Marc
---
### Author:  [@kimchy](https://discuss.elastic.co/u/kimchy)
#### Post date: [May 26, 2010, 6:20am UTC](https://discuss.elastic.co/t/unicast-problems-no-handler-found-for-action-discovery-zen-unicast/2974/3 "2010-05-26T06:20:43Z")
I have fixed the NPE, but the problem is still there. You need to configure
a list of hosts on both nodes (it can be a static list that includes both
nodes elastic ips, thats fine). The unicast ping is not started when there
is no list of hosts.
On Wed, May 26, 2010 at 5:33 AM, Marc Seeger [mail@marc-seeger.de](mailto:mail@marc-seeger.de) wrote:
> In the initial config, the port is the same as in the error messages
> (3001)
>
> On May 26, 4:32 am, Marc Seeger [m...@marc-seeger.de](mailto:m...@marc-seeger.de) wrote:
>
> > I'm trying to get the cluster working on EC2 (without the cloud
> > plugin).
> >
> > 1. I start server A
> > 2. I put the elastic ip of server A in server B's config file (in the
> > unicast options)
> >
> > discovery.zen.ping.multicast:
> > enabled: false
> >
> > discovery.zen.ping.unicast:
> > hosts: ["[ec2-xxx-xx-xx-xxx.compute-1.amazonaws.com:9300](http://ec2-xxx-xx-xx-xxx.compute-1.amazonaws.com:9300)"]
> >
> > 1. I start server B
> > 2. server B tries to connect to server A and disaplys a a null pointer
> > exception:
> >
> > [02:30:49,691][WARN][discovery.zen.ping.unicast] [Mad Thinker] Failed
> > to send ping to [[#zen\_unicast\_1#][inet[ec2-xxx-xx-xx-
> > [xxx.compute-1.amazonaws.com/10.xxx.xxx.xxx:9301](http://xxx.compute-1.amazonaws.com/10.xxx.xxx.xxx:9301)]]]
> > org.elasticsearch.transport.RemoteTransportException: [Sergei
> > Kravinoff][inet[/10.xxx.xxx.xxx:9301]][discovery/zen/unicast]
> > Caused by: java.lang.NullPointerException
> > at
>
> org.elasticsearch.transport.netty.MessageChannelHandler.handleRequest(Messa
> geChannelHandler.java:
>
> > 1. at
>
> org.elasticsearch.transport.netty.MessageChannelHandler.messageReceived(Mes
> sageChannelHandler.java:
>
> > 1.
> >
> > ```
> > at
> >
> > ```
>
> org.elasticsearch.util.netty.channel.SimpleChannelUpstreamHandler.handleUps
> tream(SimpleChannelUpstreamHandler.java:
>
> > 1.
> >
> > ```
> > at
> >
> > ```
>
> org.elasticsearch.util.netty.channel.DefaultChannelPipeline.sendUpstream(De
> faultChannelPipeline.java:
>
> > 1. at org.elasticsearch.util.netty.channel.DefaultChannelPipeline
> > $DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:
> > 2. at
>
> org.elasticsearch.util.netty.channel.Channels.fireMessageReceived(Channels.
> java:
>
> > 1. at
>
> org.elasticsearch.util.netty.handler.codec.frame.FrameDecoder.unfoldAndFire
> MessageReceived(FrameDecoder.java:
>
> > 1. at
>
> org.elasticsearch.util.netty.handler.codec.frame.FrameDecoder.callDecode(Fr
> ameDecoder.java:
>
> > 1. at
>
> org.elasticsearch.util.netty.handler.codec.frame.FrameDecoder.messageReceiv
> ed(FrameDecoder.java:
>
> > 1. at
>
> org.elasticsearch.util.netty.channel.SimpleChannelUpstreamHandler.handleUps
> tream(SimpleChannelUpstreamHandler.java:
>
> > 1.
> >
> > ```
> > at
> >
> > ```
>
> org.elasticsearch.util.netty.channel.DefaultChannelPipeline.sendUpstream(De
> faultChannelPipeline.java:
>
> > 1. at org.elasticsearch.util.netty.channel.DefaultChannelPipeline
> > $DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:
> > 2. at
>
> org.elasticsearch.transport.netty.OpenChannelsHandler.handleUpstream(OpenCh
> annelsHandler.java:
>
> > 1.
> >
> > ```
> > at
> >
> > ```
>
> org.elasticsearch.util.netty.channel.DefaultChannelPipeline.sendUpstream(De
> faultChannelPipeline.java:
>
> > 1. at
>
> org.elasticsearch.util.netty.channel.DefaultChannelPipeline.sendUpstream(De
> faultChannelPipeline.java:
>
> > 1. at
>
> org.elasticsearch.util.netty.channel.Channels.fireMessageReceived(Channels.
> java:
>
> > 1. at
>
> org.elasticsearch.util.netty.channel.Channels.fireMessageReceived(Channels.
> java:
>
> > 1. at
>
> org.elasticsearch.util.netty.channel.socket.nio.NioWorker.read(NioWorker.ja
> va:
>
> > 1. at
>
> org.elasticsearch.util.netty.channel.socket.nio.NioWorker.processSelectedKe
> ys(NioWorker.java:
>
> > 1. at
>
> org.elasticsearch.util.netty.channel.socket.nio.NioWorker.run(NioWorker.jav
> a:
>
> > 1. at
>
> org.elasticsearch.util.netty.util.ThreadRenamingRunnable.run(ThreadRenaming
> Runnable.java:
>
> > 1. at
>
> org.elasticsearch.util.netty.util.internal.IoWorkerRunnable.run(IoWorkerRun
> nable.java:
>
> > 1.
> >
> > ```
> > at java.util.concurrent.ThreadPoolExecutor
> >
> > ```
> >
> > $Worker.runTask(ThreadPoolExecutor.java:886)
> > at java.util.concurrent.ThreadPoolExecutor
> > $Worker.run(ThreadPoolExecutor.java:908)
> > at java.lang.Thread.run(Thread.java:619)
> >
> > Server A displays:
> > [02:30:46,813][WARN][transport.netty] [Sergei Kravinoff] No
> > handler found for action [discovery/zen/unicast]
> > [02:30:46,936][WARN][transport.netty] [Sergei Kravinoff]
> > Message not fully read for [0] and handler null, resetting
> >
> > Is there anything I'm missing?
> >
> > Thanks,
> > Marc
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 4:23am UTC](https://discuss.elastic.co/t/unicast-problems-no-handler-found-for-action-discovery-zen-unicast/2974/4 "2017-07-06T04:23:48Z")