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From Vissu Viswanath <viswanath4...@gmail.com>
Subject CheckPointing in giraph-1.1.0
Date Mon, 23 Sep 2013 19:01:58 GMT
Hi,
      My giraph job is working fine. But, when I introduce
conf.setCheckpointFrequency(4), it is failing. The error I am getting is:

java.lang.IllegalStateException: run: Caught an unrecoverable exception null
	at org.apache.giraph.graph.GraphMapper.run(GraphMapper.java:101)
	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:763)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:369)
	at org.apache.hadoop.mapred.Child$4.run(Child.java:259)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:416)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1059)
	at org.apache.hadoop.mapred.Child.main(Child.java:253)
Caused by: java.lang.NullPointerException
	at org.apache.giraph.utils.WritableUtils.writeVertexToDataOutput(WritableUtils.java:577)
	at org.apache.giraph.partition.SimplePartition.write(SimplePartition.java:141)
	at org.apache.giraph.worker.BspServiceWorker.storeCheckpoint(BspServiceWorker.java:1127)
	at org.apache.giraph.graph.GraphTaskManager.checkSuperstepRestarted(GraphTaskManager.java:773)
	at org.apache.giraph.graph.GraphTaskManager.execute(GraphTaskManager.java:271)
	at org.apache.giraph.graph.GraphMapper.run(GraphMapper.java:91)
	... 7 more

Can anyone help me in fixing this?

Thanks,
Vish

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