Host key verification failed

[schmidb]

Hi,
I currently try to get mpich2-yarn running on AWS EMR. I installed mpich-3.1.2 on all machines and compiled on master. Executing this
hadoop jar mpich2-yarn/target/mpich2-yarn-1.0-SNAPSHOT.jar -a cpi -M 1024 -m 1024 -n 2
I get the following error:
14/09/18 16:20:40 INFO util.Utilities: Connecting to ApplicationMaster at ip-172-31-43-192.ec2.internal/172.31.43.192:54288
14/09/18 16:20:40 INFO client.Client: Initializing ApplicationMaster
14/09/18 16:20:48 INFO client.Client: all containers are launched successfully, executing mpiexec...
14/09/18 16:20:48 INFO client.Client: [stderr] Host key verification failed.
Any idea to fix that? Do I have to enable ssh key less login to all nodes? I thought this will be dropped via YARN.

Thanks a lot Markus

[stevenybw]

Hi, Markus,

Sorry for late response, and thank you for your feedback! I thought it is a problem of known_host: when you ssh to login to a host, you have to verify that the host you're connecting to is indeed the host you want to connect to. Although MPICH-YARN will temporarily distribute RSA public key for enabling password-less login, it will not configure known_hosts for now.
You can refer to http://askubuntu.com/questions/45679/ssh-connection-problem-with-host-key-verification-failed-error. We will solve that problem later.

Steven

[stevenybw]

Hi, Markus,
Host key verification failed problem has been resolved, you can try the newest version.

Steven

[zhuoluoy]

Thanks, Steven

[schmidb]

@stevenybw thanks. But are you sure this is fixed and commited? Your last commit is 16 days ago! And I still have this problem. Did you miss to push?

[schmidb]

@stevenybw it looks like it works. But now I am running into a new issue #34

[stevenybw]

@schmidb Sorry, it seems that I failed to push to the upstream. I have pushed the changes again.