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Hive, mail # user - Hive NR map progress inconsistent and regurlarly restart from 0%


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Hive NR map progress inconsistent and regurlarly restart from 0%
Alexandre Fouche 2012-11-07, 11:30
I have a Yarn MR (with two ec2 instances to mapreduce) job on a dataset of approximately a thousand avro records, and the map phase is behaving erratically. See the progress below

What is going on there ?

            hive> select * from nikon where qs_cs_s_aid='VIEW' limit 10;

            Total MapReduce jobs = 1
            Launching Job 1 out of 1
            Number of reduce tasks is set to 0 since there's no reduce operator
            Starting Job = job_1352281315350_0020, Tracking URL = http://blabla.ec2.internal:8088/proxy/application_1352281315350_0020/
            Kill Command = /usr/lib/hadoop/bin/hadoop job  -Dmapred.job.tracker=blabla.com:8032 -kill job_1352281315350_0020
            Hadoop job information for Stage-1: number of mappers: 4; number of reducers: 0

            2012-11-07 11:14:40,976 Stage-1 map = 0%,  reduce = 0%
            2012-11-07 11:15:06,136 Stage-1 map = 1%,  reduce = 0%, Cumulative CPU 10.38 sec
            2012-11-07 11:15:07,253 Stage-1 map = 1%,  reduce = 0%, Cumulative CPU 12.18 sec
            2012-11-07 11:15:08,371 Stage-1 map = 1%,  reduce = 0%, Cumulative CPU 12.18 sec
            2012-11-07 11:15:09,491 Stage-1 map = 1%,  reduce = 0%, Cumulative CPU 12.18 sec
            2012-11-07 11:15:10,643 Stage-1 map = 2%,  reduce = 0%, Cumulative CPU 15.42 sec
            (...)
            2012-11-07 11:15:35,441 Stage-1 map = 28%,  reduce = 0%, Cumulative CPU 37.77 sec
            2012-11-07 11:15:36,486 Stage-1 map = 28%,  reduce = 0%, Cumulative CPU 37.77 sec

here restart at 16% ?

            2012-11-07 11:15:37,692 Stage-1 map = 16%,  reduce = 0%, Cumulative CPU 21.15 sec
            2012-11-07 11:15:38,815 Stage-1 map = 16%,  reduce = 0%, Cumulative CPU 21.15 sec
            2012-11-07 11:15:39,865 Stage-1 map = 16%,  reduce = 0%, Cumulative CPU 21.15 sec
            2012-11-07 11:15:41,064 Stage-1 map = 18%,  reduce = 0%, Cumulative CPU 22.4 sec
            2012-11-07 11:15:42,181 Stage-1 map = 18%,  reduce = 0%, Cumulative CPU 22.4 sec
            2012-11-07 11:15:43,299 Stage-1 map = 18%,  reduce = 0%, Cumulative CPU 22.4 sec

here restart at 0% ?

            2012-11-07 11:15:44,418 Stage-1 map = 0%,  reduce = 0%
            2012-11-07 11:16:02,076 Stage-1 map = 1%,  reduce = 0%, Cumulative CPU 6.86 sec
            2012-11-07 11:16:03,193 Stage-1 map = 1%,  reduce = 0%, Cumulative CPU 6.86 sec
            2012-11-07 11:16:04,259 Stage-1 map = 2%,  reduce = 0%, Cumulative CPU 8.45 sec
            (...)
            2012-11-07 11:16:31,291 Stage-1 map = 22%,  reduce = 0%, Cumulative CPU 35.34 sec
            2012-11-07 11:16:32,414 Stage-1 map = 26%,  reduce = 0%, Cumulative CPU 37.93 sec

here restart at 11% ?

            2012-11-07 11:16:33,459 Stage-1 map = 11%,  reduce = 0%, Cumulative CPU 19.53 sec
            2012-11-07 11:16:34,507 Stage-1 map = 11%,  reduce = 0%, Cumulative CPU 19.53 sec
            2012-11-07 11:16:35,731 Stage-1 map = 13%,  reduce = 0%, Cumulative CPU 21.47 sec
            (...)
            2012-11-07 11:16:46,839 Stage-1 map = 17%,  reduce = 0%, Cumulative CPU 24.14 sec

here restart at 0% ?

            2012-11-07 11:16:47,939 Stage-1 map = 0%,  reduce = 0%
            2012-11-07 11:16:56,653 Stage-1 map = 1%,  reduce = 0%, Cumulative CPU 7.54 sec
            2012-11-07 11:16:57,814 Stage-1 map = 1%,  reduce = 0%, Cumulative CPU 7.54 sec
            (...)

Needless to say the job crashes after some time with an Error: java.io.IOException: java.io.IOException: java.lang.ArrayIndexOutOfBoundsException: -56