Neo4j CPU utilization reaches 100%. why?

I have a Linux instance on which neo4j is deployed. It is working fine but from 2-3 days sometimes CPU utilization reaches 100% and the DB stop responding to any request.Even, I’m not able to open the DB in the browser. Then, I need to reboot the instance which is not good.

Below the logs which have found in debug.log

old [223790]:  Check pointing completed
2018-01-04 17:12:38.329+0000 INFO [o.n.k.i.t.l.p.LogPruningImpl] Log Rotation [6]:  Starting log pruning.
2018-01-04 17:12:38.329+0000 INFO [o.n.k.i.t.l.p.LogPruningImpl] Log Rotation [6]:  Log pruning complete.
2018-01-04 17:14:20.225+0000 WARN [o.n.k.i.c.MonitorGc] GC Monitor: Application threads blocked for 389ms.
2018-01-04 17:14:33.212+0000 WARN [o.n.k.i.c.MonitorGc] GC Monitor: Application threads blocked for 267ms.
2018-01-04 17:16:32.934+0000 WARN [o.n.k.i.c.MonitorGc] GC Monitor: Application threads blocked for 237ms.
2018-01-04 17:16:34.253+0000 WARN [o.n.k.i.c.MonitorGc] GC Monitor: Application threads blocked for 317ms.
2018-01-04 17:17:16.896+0000 WARN [o.n.k.i.c.MonitorGc] GC Monitor: Application threads blocked for 291ms.
2018-01-04 17:17:20.761+0000 ERROR [o.n.b.v.t.BoltProtocolV1] Failed to write response to driver Cannot write to buffer when closed
java.io.IOException: Cannot write to buffer when closed
        at org.neo4j.bolt.v1.transport.ChunkedOutput.ensure(ChunkedOutput.java:163)
        at org.neo4j.bolt.v1.transport.ChunkedOutput.writeShort(ChunkedOutput.java:94)
        at org.neo4j.bolt.v1.packstream.PackStream$Packer.packStructHeader(PackStream.java:427)
        at org.neo4j.bolt.v1.messaging.BoltResponseMessageWriter.onSuccess(BoltResponseMessageWriter.java:76)
        at org.neo4j.bolt.v1.messaging.MessageProcessingHandler.onFinish(MessageProcessingHandler.java:111)
        at org.neo4j.bolt.v1.runtime.BoltStateMachine.after(BoltStateMachine.java:102)
        at org.neo4j.bolt.v1.runtime.BoltStateMachine.reset(BoltStateMachine.java:175)
        at org.neo4j.bolt.v1.messaging.BoltMessageRouter.lambda$onReset$2(BoltMessageRouter.java:74)
        at org.neo4j.bolt.v1.runtime.concurrent.RunnableBoltWorker.execute(RunnableBoltWorker.java:130)
        at org.neo4j.bolt.v1.runtime.concurrent.RunnableBoltWorker.run(RunnableBoltWorker.java:91)
        at java.lang.Thread.run(Thread.java:748)

I’m not getting why I’m getting this IOException Please help me to find the solution!

[lutovich]

@Anurag690 I’m no longer maintaining this driver. You are in good hands with @zhenlineo 😃

[zhenlineo]

Hi @Anurag690, If you have a Neo4j cpu usage problem, you could start an issue on neo4j with necessary information for us to help you debug your problem.