Hi,
  When I run a giraph program, it hangs there forever with output like:
14/04/02 10:16:43 INFO zookeeper.ClientCnxn: Opening socket connection to server compute-0-16.local/10.1.255.238:22181. Will not attempt to authenticate using SASL (unknown error)
14/04/02 10:16:43 INFO zookeeper.ClientCnxn: Socket connection established to compute-0-16.local/10.1.255.238:22181, initiating session
14/04/02 10:16:43 INFO zookeeper.ClientCnxn: Session establishment complete on server compute-0-16.local/10.1.255.238:22181, sessionid = 0x1452302cc870005, negotiated timeout = 600000
14/04/02 10:16:43 INFO job.JobProgressTracker: Data from 4 workers - Compute superstep 0: 1000 out of 1000 vertices computed; 16 out of 16 partitions computed; min free memory on worker 0 - 179.86MB, average 202.77MB
14/04/02 10:16:44 INFO mapred.JobClient:  map 100% reduce 0%
14/04/02 10:16:48 INFO job.JobProgressTracker: Data from 4 workers - Compute superstep 0: 1000 out of 1000 vertices computed; 16 out of 16 partitions computed; min free memory on worker 0 - 179.86MB, average 201.15MB
14/04/02 10:16:53 INFO job.JobProgressTracker: Data from 4 workers - Compute superstep 0: 1000 out of 1000 vertices computed; 16 out of 16 partitions computed; min free memory on worker 0 - 179.86MB, average 201.15MB
14/04/02 10:16:58 INFO job.JobProgressTracker: Data from 4 workers - Compute superstep 0: 1000 out of 1000 vertices computed; 16 out of 16 partitions computed; min free memory on worker 0 - 179.86MB, average 201.15MB
14/04/02 10:17:03 INFO job.JobProgressTracker: Data from 4 workers - Compute superstep 0: 1000 out of 1000 vertices computed; 16 out of 16 partitions computed; min free memory on worker 3 - 174.34MB, average 207.9MB
14/04/02 10:17:08 INFO job.JobProgressTracker: Data from 4 workers - Compute superstep 0: 1000 out of 1000 vertices computed; 16 out of 16 partitions computed; min free memory on worker 3 - 174.34MB, average 207.9MB
14/04/02 10:17:13 INFO job.JobProgressTracker: Data from 4 workers - Compute superstep 0: 1000 out of 1000 vertices computed; 16 out of 16 partitions computed; min free memory on worker 3 - 174.34MB, average 207.9MB

The input is only a common graph with 1000 lines and 800kB size. But the program runs without problem for small graph and returns expected results. What are the possible reasons? Thanks!

  Best Regards,
  Suijian