Alessandro Presta created GIRAPH-556:
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Summary: Race condition in EdgeStore
Key: GIRAPH-556
URL: https://issues.apache.org/jira/browse/GIRAPH-556
Project: Giraph
Issue Type: Bug
Reporter: Alessandro Presta
Priority: Critical
In EdgeStore#addPartitionEdges(), when there is no VertexEdges data structure
for a vertex, we try to insert a newly-created one. If the insertion is
successful, we initialize it and later insert an edge in the synchronized block.
It can happen that, between creation and initialization, another thread
acquires the lock and tries to add an edge, leading to a NullPointerException
for many implementations of VertexEdges.
The fix is to create and initialize the structure before we try to insert it.
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