Hadoop reduce task gets hung
- by user806098
I set up a hadoop cluster with 4 nodes, When running a map-reduce task, the map task finishes quickly, while the reduce task hangs at 27% percent. I checked the log, it's that the reduce task fails to fetch map output from map nodes.
The job tracker log of master shows messages like this:
2011-06-27 19:55:14,748 INFO…