Exception while running janusgraph : Temporary exception during backend operation

[Dilan Ranasinghe]

Hello ,
I run janusgraph/gremlin server with hbase and connect to it using web socket.

In the gremlin server log i constantly see the following exception.

[gremlin-server-exec-2] INFO  org.janusgraph.diskstorage.

util.BackendOperation  - Temporary exception during backend operation [CacheMutation]. Attempting backoff retry.
org.janusgraph.diskstorage.TemporaryBackendException: Temporary failure in storage backend
        at org.janusgraph.diskstorage.hbase.HBaseStoreManager.mutateMany(HBaseStoreManager.java:434)
        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$1.call(CacheTransaction.java:95)
        at org.janusgraph.diskstorage.util.BackendOperation.executeDirect(BackendOperation.java:69)
        at org.janusgraph.diskstorage.util.BackendOperation.execute(BackendOperation.java:55)
        at org.janusgraph.diskstorage.keycolumnvalue.cache.CacheTransaction.persist(CacheTransaction.java:95)
        at org.janusgraph.diskstorage.keycolumnvalue.cache.CacheTransaction.flushInternal(CacheTransaction.java:137)
        at org.janusgraph.diskstorage.keycolumnvalue.cache.CacheTransaction.mutate(CacheTransaction.java:90)
        at org.janusgraph.diskstorage.keycolumnvalue.cache.KCVSCache.mutateEntries(KCVSCache.java:66)
        at org.janusgraph.diskstorage.BackendTransaction.mutateEdges(BackendTransaction.java:200)
        at org.janusgraph.graphdb.database.StandardJanusGraph.prepareCommit(StandardJanusGraph.java:602)
        at org.janusgraph.graphdb.database.StandardJanusGraph.commit(StandardJanusGraph.java:713)
        at org.janusgraph.graphdb.transaction.StandardJanusGraphTx.commit(StandardJanusGraphTx.java:1363)
        at org.janusgraph.graphdb.tinkerpop.JanusGraphBlueprintsGraph$GraphTransaction.doCommit(JanusGraphBlueprintsGraph.java:272)
        at org.apache.tinkerpop.gremlin.structure.util.AbstractTransaction.commit(AbstractTransaction.java:105)
        at org.apache.tinkerpop.gremlin.server.GraphManager.lambda$commitAll$2(GraphManager.java:122)
        at java.util.concurrent.ConcurrentHashMap$EntrySetView.forEach(ConcurrentHashMap.java:4795)
        at org.apache.tinkerpop.gremlin.server.GraphManager.commitAll(GraphManager.java:119)
        at org.apache.tinkerpop.gremlin.server.op.AbstractOpProcessor.attemptCommit(AbstractOpProcessor.java:299)
        at org.apache.tinkerpop.gremlin.server.op.AbstractOpProcessor.handleIterator(AbstractOpProcessor.java:168)
        at org.apache.tinkerpop.gremlin.server.op.AbstractEvalOpProcessor.lambda$evalOpInternal$4(AbstractEvalOpProcessor.java:248)
        at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$2(GremlinExecutor.java:298)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.InterruptedIOException
        at org.apache.hadoop.hbase.client.AsyncProcess$AsyncRequestFutureImpl.waitUntilDone(AsyncProcess.java:1635)
        at org.apache.hadoop.hbase.client.HTable.batch(HTable.java:911)
        at org.janusgraph.diskstorage.hbase.HTable1_0.batch(HTable1_0.java:51)
        at org.janusgraph.diskstorage.hbase.HBaseStoreManager.mutateMany(HBaseStoreManager.java:429)
        ... 26 more

My application constantly send requests to the server so the load for the server is high.

What can be the reason for this exception?

Thanks,
Dilan.

[Misha Brukman]

Looks like this was a duplicate of an earlier post which I've answered. Please avoid posting duplicate messages to the list for the same problem. If there is new information, reply to the earlier post so that the thread stays together.

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