Hitting the JanusGraphException when loading vertexes

[madhuvasu]

We are seeing the following exception when running the janusgraph-utils to import vertexes:
14:10:22,084 INFO VertexLoaderWorker:122 - Starting new thread ff35bb84-73e7-4482-b7e5-5eb93c15485e
14:10:24,314 ERROR StandardJanusGraph:740 - Could not commit transaction [20774] due to storage exception in commit
org.janusgraph.core.JanusGraphException: Could not execute operation due to backend exception
at org.janusgraph.diskstorage.util.BackendOperation.execute(BackendOperation.java:57)
at org.janusgraph.diskstorage.keycolumnvalue.cache.CacheTransaction.persist(CacheTransaction.java:95)
at org.janusgraph.diskstorage.keycolumnvalue.cache.CacheTransaction.flushInternal(CacheTransaction.java:143)
at org.janusgraph.diskstorage.keycolumnvalue.cache.CacheTransaction.commit(CacheTransaction.java:200)
at org.janusgraph.diskstorage.BackendTransaction.commitStorage(BackendTransaction.java:134)
at org.janusgraph.graphdb.database.StandardJanusGraph.commit(StandardJanusGraph.java:737)
at org.janusgraph.graphdb.transaction.StandardJanusGraphTx.commit(StandardJanusGraphTx.java:1374)
at com.ibm.janusgraph.utils.importer.vertex.VertexLoaderWorker.acceptRecord(VertexLoaderWorker.java:109)
at com.ibm.janusgraph.utils.importer.vertex.VertexLoaderWorker.access$000(VertexLoaderWorker.java:35)
at com.ibm.janusgraph.utils.importer.vertex.VertexLoaderWorker$1.accept(VertexLoaderWorker.java:130)
at com.ibm.janusgraph.utils.importer.vertex.VertexLoaderWorker$1.accept(VertexLoaderWorker.java:126)
at java.util.ArrayList$Itr.forEachRemaining(ArrayList.java:899)
at com.ibm.janusgraph.utils.importer.vertex.VertexLoaderWorker.run(VertexLoaderWorker.java:126)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.janusgraph.diskstorage.PermanentBackendException: Permanent failure in storage backend
at org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftKeyColumnValueStore.convertException(CassandraThriftKeyColumnValueStore.java:263)
at org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager.mutateMany(CassandraThriftStoreManager.java:315)
at org.janusgraph.diskstorage.locking.consistentkey.ExpectedValueCheckingStoreManager.mutateMany(ExpectedValueCheckingStoreManager.java:79)
at org.janusgraph.diskstorage.keycolumnvalue.cache.CacheTransaction$1.call(CacheTransaction.java:98)
at org.janusgraph.diskstorage.keycolumnvalue.cache.CacheTransaction$1.call(CacheTransaction.java:95)
at org.janusgraph.diskstorage.util.BackendOperation.executeDirect(BackendOperation.java:69)
at org.janusgraph.diskstorage.util.BackendOperation.execute(BackendOperation.java:55)
... 17 more
Caused by: TimedOutException(acknowledged_by:0, acknowledged_by_batchlog:true)
at org.apache.cassandra.thrift.Cassandra$atomic_batch_mutate_result$atomic_batch_mutate_resultStandardScheme.read(Cassandra.java:29624)
at org.apache.cassandra.thrift.Cassandra$atomic_batch_mutate_result$atomic_batch_mutate_resultStandardScheme.read(Cassandra.java:29592)
at org.apache.cassandra.thrift.Cassandra$atomic_batch_mutate_result.read(Cassandra.java:29526)
at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:78)
at org.apache.cassandra.thrift.Cassandra$Client.recv_atomic_batch_mutate(Cassandra.java:1108)
at org.apache.cassandra.thrift.Cassandra$Client.atomic_batch_mutate(Cassandra.java:1094)
at org.janusgraph.diskstorage.cassandra.thrift.CassandraThriftStoreManager.mutateMany(CassandraThriftStoreManager.java:310)
... 22 more

Any help on debugging this will be greatly appreciated. I have tried searching for this exception but to not much luck. Please note we are running on janusgraph 0.2.0 and cassandra is running locally with janusgraph and elasticsearch.

[madhuvasu]

janusgraph-fci-graph.properties.txt
batch_import.properties.txt

Please find attached our JanusGraph configuration and the batch import properties.