java - How do I know if mappers(or reducers) are running in parallel in Hadoop? -

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java - How do I know if mappers(or reducers) are running in parallel in Hadoop? -

i running mapreduce jobs on hadoop - 2.3.0 cluster 8 slave nodes, jobs taking longer expected time execute.

how test whether map(or reduce) tasks running in parallel?

and properties have modified in configuration files mappers(in case 8 of them) run in parallel.

you should check in hadoop cluster web interface.

go url track job status, line looks one:

15/04/11 17:29:07 info mapreduce.job: url track job: http://hadoopsrv:60540/proxy/application_1428349332728_0303/

this web page displays job status (succeeded/failed...), time each task complete, number of map/reduce tasks , status, logs, etc...

java hadoop parallel-processing mapreduce

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