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Tez jobs getting stuck - AMRM callback handler thread

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Tez jobs getting stuck - AMRM callback handler thread

New Contributor

HI

we are executing our jobs in TEZ, in few cases where 1000 mappers and 250 reducers are launched, suddenly the jobs are getting stuck and starting again in few mins.I looked at the logs and found that whenever the job is stuck,  AMRM call back Handler is being populated in the logs 

 

may I know what does AMRM callback Handler Thread is for and why my jobs are getting stuck in middle yarn_logs.png

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