The new AM fails to start after RM restarts. It fails to start new Application master and job fails with below error.
/usr/bin/mapred job -status job_1380985373054_0001
13/10/05 15:04:04 INFO client.RMProxy: Connecting to ResourceManager at hostname
Job File: /user/abc/.staging/job_1380985373054_0001/job.xml
Job Tracking URL : http://hostname:8088/cluster/app/application_1380985373054_0001
Uber job : false
Number of maps: 0
Number of reduces: 0
map() completion: 0.0
reduce() completion: 0.0
Job state: FAILED
reason for failure: There are no failed tasks for the job. Job is failed due to some other reason and reason can be found in the logs.