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Could not execute operation due to backend exception
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Could not execute operation due to backend exception
com.thinkaurelius.titan.core.TitanException: Could not execute operation due to backend exception at com.thinkaurelius.titan.diskstorage.util.BackendOperation.execute(BackendOperation.java:44)[titan-core-1.0.0.jar:na] at com.thinkaurelius.titan.diskstorage.util.BackendOperation.execute(BackendOperation.java:144)[titan-core-1.0.0.jar:na] at com.thinkaurelius.titan.diskstorage.log.kcvs.KCVSLog$MessagePuller.run(KCVSLog.java:703)[titan-core-1.0.0.jar:na] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)[na:1.8.0_101] at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)[na:1.8.0_101] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)[na:1.8.0_101] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)[na:1.8.0_101] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)[na:1.8.0_101] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)[na:1.8.0_101] at java.lang.Thread.run(Thread.java:745)[na:1.8.0_101]Caused by: com.thinkaurelius.titan.diskstorage.TemporaryBackendException: Could not successfully complete backend operation due to repeated temporary exceptions after PT4S at com.thinkaurelius.titan.diskstorage.util.BackendOperation.executeDirect(BackendOperation.java:86)[titan-core-1.0.0.jar:na] at com.thinkaurelius.titan.diskstorage.util.BackendOperation.execute(BackendOperation.java:42)[titan-core-1.0.0.jar:na] ... 9 moreCaused by: com.thinkaurelius.titan.diskstorage.TemporaryBackendException: Temporary failure in storage backend at com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxKeyColumnValueStore.getNamesSlice(AstyanaxKeyColumnValueStore.java:114)[titan-cassandra-1.0.0.jar:na] at com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxKeyColumnValueStore.getNamesSlice(AstyanaxKeyColumnValueStore.java:78)[titan-cassandra-1.0.0.jar:na] at com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxKeyColumnValueStore.getSlice(AstyanaxKeyColumnValueStore.java:67)[titan-cassandra-1.0.0.jar:na] at com.thinkaurelius.titan.diskstorage.log.kcvs.KCVSLog$MessagePuller$1.call(KCVSLog.java:769)[titan-core-1.0.0.jar:na] at com.thinkaurelius.titan.diskstorage.log.kcvs.KCVSLog$MessagePuller$1.call(KCVSLog.java:766)[titan-core-1.0.0.jar:na] at com.thinkaurelius.titan.diskstorage.util.BackendOperation.execute(BackendOperation.java:133)[titan-core-1.0.0.jar:na] at com.thinkaurelius.titan.diskstorage.util.BackendOperation$1.call(BackendOperation.java:147)[titan-core-1.0.0.jar:na] at com.thinkaurelius.titan.diskstorage.util.BackendOperation.executeDirect(BackendOperation.java:56)[titan-core-1.0.0.jar:na] ... 10 moreCaused by: com.netflix.astyanax.connectionpool.exceptions.NoAvailableHostsException: NoAvailableHostsException: [host=None(0.0.0.0):0, latency=0(0), attempts=0]No hosts to borrow from at com.netflix.astyanax.connectionpool.impl.RoundRobinExecuteWithFailover.<init>(RoundRobinExecuteWithFailover.java:48)[astyanax-core-3.8.0.jar:3.8.0] at com.netflix.astyanax.connectionpool.impl.TokenAwareConnectionPoolImpl.newExecuteWithFailover(TokenAwareConnectionPoolImpl.java:83)[astyanax-core-3.8.0.jar:3.8.0] at com.netflix.astyanax.connectionpool.impl.AbstractHostPartitionConnectionPool.executeWithFailover(AbstractHostPartitionConnectionPool.java:352)[astyanax-core-3.8.0.jar:3.8.0] at com.netflix.astyanax.thrift.ThriftColumnFamilyQueryImpl$4.execute(ThriftColumnFamilyQueryImpl.java:538)[astyanax-thrift-3.8.0.jar:3.8.0] at com.thinkaurelius.titan.diskstorage.cassandra.astyanax.AstyanaxKeyColumnValueStore.getNamesSlice(AstyanaxKeyColumnValueStore.java:112)[titan-cassandra-1.0.0.jar:na] ... 17 more