Looking at the job counters page on the history server for a finished job, it shows 3 columns for each counter - map, reduce, total. The total appears correct, but map and reduce columns are always zero. If you click on a particular column it does show you the map/reduce task and the value of each one.
Going to attach screenshots shortly.
|Status||Patch Available [ 10002 ]||Resolved [ 5 ]|
|Hadoop Flags||Reviewed [ 10343 ]|
|Release Note||Fixed two bugs in Counters because of which web app displays zero counter values for framework counters.|
|Target Version/s||0.23.1 [ 12318883 ]|
|Fix Version/s||0.23.2 [ 12319851 ]|
|Resolution||Fixed [ 1 ]|
|Assignee||Bhallamudi Venkata Siva Kamesh [ kamesh ]|
|Status||Open [ 1 ]||Patch Available [ 10002 ]|