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Hadoop, mail # user - 8021 failed on connection exception: java.net.ConnectException: Connection refused at org.apache.hadoop.ipc.Client.wrapException(Client.java:1095)


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RE: 8021 failed on connection exception: java.net.ConnectException: Connection refused at org.apache.hadoop.ipc.Client.wrapException(Client.java:1095)
Leo Leung 2012-05-16, 17:47
Hmm...
Waqas,  I think you are using pre 1.6.0.20 build, and likely to be OpenJDK.

Please try the Sun/Oracle JDK 1.6.0_26+  (as Harsh said.. don't stay away from 1.7)

And if I'm reading the logs right you are using the older release of HDP?.  V1.0.0
If this is the case, you may also want to check with the HortonWorks team.

Their distro datanode uses 32bit JDK and the NN uses 64bit.  You'll have to be careful of running the right JVM for each node type in the same host.

BTW, also I think you are starting the JT as "wagas",  try running it under mapred.
Something like
$ su - mapred -c "<path to your hadoop-dameon.sh>  start jobtracker"  (once you fix the JVM versions)

Cheers

-----Original Message-----
From: Harsh J [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, May 16, 2012 8:59 AM
To: [EMAIL PROTECTED]
Subject: Re: 8021 failed on connection exception: java.net.ConnectException: Connection refused at org.apache.hadoop.ipc.Client.wrapException(Client.java:1095)

Hi,

On Wed, May 16, 2012 at 9:17 PM, waqas latif <[EMAIL PROTECTED]> wrote:
> Hi I tried it with java 6 but with no success here are the links for
> log and out file of jobtracker with java 6 logfile link
> http://pastebin.com/bvWZRt0A
>
> outfile link is here which is a bit different from the java 7
> http://pastebin.com/4YCZhQGh

Now this does look odd (and is again the same thing). What exactly is your Java6 version? i.e. java -version output?

Do you also get the same error if you try a "hadoop jobtracker"
directly in the CLI?

> Also please keep in mind that i can run hadoop 0.20 with java home
> path set to java 7.

You may be able to, but none of us presently test it with that configuration. So if you run into bugs or odd behavior with that, you'll pretty much be alone :)

--
Harsh J