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From Ted Yu <yuzhih...@gmail.com>
Subject Re: Failed to start datanode due to bind exception
Date Tue, 10 Feb 2015 18:24:14 GMT
The exception came from DomainSocket so using netstat wouldn't reveal the
conflict.

What's the output from:
ls -l /var/run/hdfs-sockets/datanode

Which hadoop release are you using ?

Cheers

On Tue, Feb 10, 2015 at 10:12 AM, Rajesh Thallam <rajesh.thallam@gmail.com>
wrote:

> I have been repeatedly trying to start datanode but it fails with bind
> exception saying address is already in use even though port is free
>
> I used below commands to check
>
> netstat -a -t --numeric-ports -p | grep 500
>
>
>
> I have overridden default port 50070 with 50081 but the issue still
> persists.
>
> Starting DataNode with maxLockedMemory = 0
> Opened streaming server at /172.19.7.160:50081
> Balancing bandwith is 10485760 bytes/s
> Number threads for balancing is 5
> Waiting for threadgroup to exit, active threads is 0
> Shutdown complete.
> Exception in secureMain
> java.net.BindException: bind(2) error: Address already in use when trying
> to bind to '/var/run/hdfs-sockets/datanode'
>     at org.apache.hadoop.net.unix.DomainSocket.bind0(Native Method)
>     at
> org.apache.hadoop.net.unix.DomainSocket.bindAndListen(DomainSocket.java:191)
>     at
> org.apache.hadoop.hdfs.net.DomainPeerServer.<init>(DomainPeerServer.java:40)
>     at
> org.apache.hadoop.hdfs.server.datanode.DataNode.getDomainPeerServer(DataNode.java:907)
>     at
> org.apache.hadoop.hdfs.server.datanode.DataNode.initDataXceiver(DataNode.java:873)
>     at
> org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:1066)
>     at
> org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:411)
>     at
> org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:2297)
>     at
> org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:2184)
>     at
> org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:2231)
>     at
> org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:2407)
>     at
> org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:2431)
> Exiting with status 1
> hdfs-site.xml
>
>   <property>
>     <name>dfs.datanode.address</name>
>     <value>hostname.dc.xx.org:50010</value>
>   </property>
>   <property>
>     <name>dfs.datanode.ipc.address</name>
>     <value>hostname.dc.xx.org:50020</value>
>   </property>
>   <property>
>     <name>dfs.datanode.http.address</name>
>     <value>hostname.dc.xx.org:50075</value>
>   </property>
>
> Regards,
> RT
>

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