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Date: Sat, 29 Sep 2012 07:58:09 +1100 (NCT)
From: "Avery Ching (JIRA)" <jira@apache.org>
To: giraph-dev@incubator.apache.org
Message-ID: <839687260.140896.1348865889148.JavaMail.jiratomcat@arcas>
Subject: [jira] [Created] (GIRAPH-351) Fail job early when there is no input
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Avery Ching created GIRAPH-351:
----------------------------------

             Summary: Fail job early when there is no input
                 Key: GIRAPH-351
                 URL: https://issues.apache.org/jira/browse/GIRAPH-351
             Project: Giraph
          Issue Type: Improvement
            Reporter: Avery Ching


Right now we get a cryptic error message when we know that there is no input!

2012-09-28 13:45:20,410 INFO org.apache.giraph.graph.BspServiceMaster: generateInputSplits: Got 0 input splits for 100 workers
2012-09-28 13:45:20,410 WARN org.apache.giraph.graph.BspServiceMaster: createInputSplits: Number of inputSplits=0 < 100=number of healthy processes, some workers will be not used

But the job keeps on going and the workers get the exception 

java.lang.IllegalStateException: setup: loadVertices failed due to KeeperException
	at org.apache.giraph.graph.BspServiceWorker.setup(BspServiceWorker.java:628)
	at org.apache.giraph.graph.GraphMapper.setup(GraphMapper.java:370)
	at org.apache.giraph.graph.GraphMapper.run(GraphMapper.java:570)
	at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:632)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
	at org.apache.hadoop.mapred.Child.main(Child.java:171)
Caused by: org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /_hadoopBsp/job_201209271814.325_0001/_inputSplitDir
	at org.apache.zookeeper.KeeperException.create(KeeperException.java:102)
	at org.apache.zookeeper.KeeperException.create(KeeperException.java:42)
	at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1243)
	at org.apache.zookeeper.ZooKeeper.getChildren(ZooKeeper.java:1271)
	at org.apache.giraph.zk.ZooKeeperExt.getChildrenExt(ZooKeeperExt.java:273)
	at org.apache.giraph.graph.BspServiceWorker.reserveInputSplit(BspServiceWorker.java:225)
	at org.apache.giraph.graph.BspServiceWorker.loadVertices(BspServiceWorker.java:320)
	at org.apache.giraph.graph.BspServiceWorker.setup(BspServiceWorker.java:607)
	... 5 more

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