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.

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