[GIRAPH-735] DiskBackedPartitionStore throws NPE due to uninitialized OutEdges

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.1.0
• Fix Version/s: 1.1.0
• Component/s: graph
• Assignee: Unassigned
• Reporter: Craig Muchinsky
• Created: 09/Aug/13 18:44
• Updated: 15/Aug/13 15:31
• Resolved: 15/Aug/13 15:25

Description

The DiskBackedPartitionStore is throwing an NPE when trying to load a partition from disk. It seems to be related to the call to ImmutableClassesGiraphConfiguration.createOutEdges() which doesn't initialize the OutEdges before it attempts to populate them via Vertex.initialize(). Simply switching to ImmutableClassesGiraphConfiguration.createAndInitializeOutEdges() seems to correct the following stack trace:

Caused by: java.lang.NullPointerException
at org.apache.giraph.edge.HashMapEdges.write(HashMapEdges.java:130)
at org.apache.giraph.utils.WritableUtils.writeVertexToDataOutput(WritableUtils.java:578)
at org.apache.giraph.utils.WritableUtils.writeVertexToByteArray(WritableUtils.java:409)
at org.apache.giraph.utils.WritableUtils.writeVertexToByteArray(WritableUtils.java:436)
at org.apache.giraph.partition.ByteArrayPartition.putVertex(ByteArrayPartition.java:92)
at org.apache.giraph.partition.DiskBackedPartitionStore.loadPartition(DiskBackedPartitionStore.java:457)
at org.apache.giraph.partition.DiskBackedPartitionStore.access$1000(DiskBackedPartitionStore.java:74)
at org.apache.giraph.partition.DiskBackedPartitionStore$GetPartition.call(DiskBackedPartitionStore.java:695)
at org.apache.giraph.partition.DiskBackedPartitionStore$GetPartition.call(DiskBackedPartitionStore.java:631)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:314)
at java.util.concurrent.FutureTask.run(FutureTask.java:149)
at org.apache.giraph.partition.DiskBackedPartitionStore$DirectExecutorService.execute(DiskBackedPartitionStore.java:943)
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:103)