mapreduce - Map-Reduce Logs on Hive-Tez -

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i want interpretation of map-reduce logs after running query on hive-tez ? lines after info: conveys ? here have attached sample 

info  : session open info  : dag name: select a.model...) info  : tez session closed. reopening... info  : session re-established. info  :  info  : status: running (executing on yarn cluster app id application_14708112341234_1234)  info  : map 1: -/-  map 3: -/-  map 4: -/-  map 7: -/-  reducer 2: 0/15     reducer 5: 0/26 reducer 6: 0/13  info  : map 1: -/-  map 3: 0/118    map 4: 0/118    map 7: 0/1  reducer 2: 0/15 reducer 5: 0/26  reducer 6: 0/13 info  : map 1: 0/118    map 3: 0/118    map 4: 0/118    map 7: 0/1  reducer 2: 0/15 reducer 5: 0/26 reducer 6: 0/13  info  : map 1: 0/118    map 3: 0/118    map 4: 0(+5)/118    map 7: 0/1  reducer 2: 0/15 reducer 5: 0/26 reducer 6: 0/13  info  : map 1: 0/118    map 3: 0(+5)/118    map 4: 0(+7)/118    map 7: 0(+1)/1  reducer 2: 0/15 reducer 5: 0/26 reducer 6: 0/13  info  : map 1: 0/118    map 3: 0(+15)/118   map 4: 0(+18)/118   map 7: 0(+1)/1  reducer 2: 0/15 reducer 5: 0/26 reducer 6: 0/13

the log posted dag execution log. dag consists of map 1,map 3,map 4,map 7 mappers vertices , reducers: reducer 2,reducer 5,reducer 6

info : map 1: -/- means vertex not initialized, number of mappers not calculated yet.

map 4: 0(+7)/118 - means totally there 118 mappers, 7 of them running in parallel, 0 completed yet, 118-7=111 pending.

 reducer 2: 0/15 - means totally there 15 reducers, 0 of them running, 0 of them completed (15 reducers pending).

negative figures (there no such in example) = number of failed or killed mappers or reducers


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