Hello, I've got a 6 node grid with maxSize (dataregionconfig) set to 300G each. The grid seemed to be performing normally until at one point it started logging "Partition states validation has failed for group" warning - see attached log file. This kept happening for about 3 minutes and then stopped (see line 85 in the attached log file). Just then a client seems to have connected (see line 135 where connection was accepted). But soon after, it kept logging the below exception. After a while (~1 hour), it started showing logging "Partition states validation has failed for group" again (line 284).
2019-09-19 13:28:28.601 [INFO ] [exchange-worker-#176] GridDhtPartitionsExchangeFuture - Completed partition exchange [localNode=0c643dd0-a884-4fd0-acb3-a6d7e2c5e71d, exchange=GridDhtPartitionsExchangeFuture [topVer =AffinityTopologyVersion [topVer=126, minorTopVer=0], evt=NODE_JOINED, evtNode=ZookeeperClusterNode [id=af5f33f4-842a-4691-8e84-da4fb19eafb2, addrs=[10.126.90.78, 10.115.76.13, 127.0.0.1], order=126, loc=false, clie nt=true], done=true], topVer=AffinityTopologyVersion [topVer=126, minorTopVer=0], durationFromInit=0] 2019-09-19 13:28:28.601 [INFO ] [exchange-worker-#176] time - Finished exchange init [topVer=AffinityTopologyVersion [topVer=126, minorTopVer=0], crd=true] 2019-09-19 13:28:28.602 [INFO ] [exchange-worker-#176] GridCachePartitionExchangeManager - Skipping rebalancing (nothing scheduled) [top=AffinityTopologyVersion [topVer=126, minorTopVer=0], force=false, evt=NODE_JOI NED, node=af5f33f4-842a-4691-8e84-da4fb19eafb2] 2019-09-19 13:28:29.513 [INFO ] [grid-nio-worker-tcp-comm-14-#130] TcpCommunicationSpi - Accepted incoming communication connection [locAddr=/10.115.248.110:12122, rmtAddr=/10.115.76.13:45464] 2019-09-19 13:28:29.540 [INFO ] [grid-nio-worker-tcp-comm-15-#131] TcpCommunicationSpi - Accepted incoming communication connection [locAddr=/10.115.248.110:12122, rmtAddr=/10.115.76.13:45466] 2019-09-19 13:28:29.600 [INFO ] [grid-nio-worker-tcp-comm-16-#132] TcpCommunicationSpi - Accepted incoming communication connection [locAddr=/10.115.248.110:12122, rmtAddr=/10.115.76.13:45472] 2019-09-19 13:28:51.624 [ERROR] [grid-nio-worker-tcp-comm-17-#133] TcpCommunicationSpi - Failed to read data from remote connection (will wait for 2000ms). org.apache.ignite.IgniteCheckedException: Failed to select events on selector. at org.apache.ignite.internal.util.nio.GridNioServer$AbstractNioClientWorker.bodyInternal(GridNioServer.java:2182) ~[ignite-core-2.7.5-0-2.jar:2.7.5] at org.apache.ignite.internal.util.nio.GridNioServer$AbstractNioClientWorker.body(GridNioServer.java:1794) [ignite-core-2.7.5-0-2.jar:2.7.5] at org.apache.ignite.internal.util.worker.GridWorker.run(GridWorker.java:120) [ignite-core-2.7.5-0-2.jar:2.7.5] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_172] Caused by: java.nio.channels.ClosedChannelException at java.nio.channels.spi.AbstractSelectableChannel.register(AbstractSelectableChannel.java:197) ~[?:1.8.0_172] at org.apache.ignite.internal.util.nio.GridNioServer$AbstractNioClientWorker.bodyInternal(GridNioServer.java:1997) ~[ignite-core-2.7.5-0-2.jar:2.7.5] ... 3 more after a lot of these exceptions and warnings, the node started throwing the below (client had started ingestion using datastreamer). And the below exceptions were seen on all the nodes 2019-09-19 15:10:38.922 [ERROR] [grid-timeout-worker-#115] - Critical system error detected. Will be handled accordingly to configured handler [hnd=StopNodeOrHaltFailureHandler [tryStop=false, timeout=0, super=Abst ractFailureHandler [ignoredFailureTypes=[SYSTEM_WORKER_BLOCKED, SYSTEM_CRITICAL_OPERATION_TIMEOUT]]], failureCtx=FailureContext [type=SYSTEM_WORKER_BLOCKED, err=class o.a.i.IgniteException: GridWorker [name=data-str eamer-stripe-42, igniteInstanceName=null, finished=false, heartbeatTs=1568920228643]]] org.apache.ignite.IgniteException: GridWorker [name=data-streamer-stripe-42, igniteInstanceName=null, finished=false, heartbeatTs=1568920228643] at org.apache.ignite.internal.IgnitionEx$IgniteNamedInstance$2.apply(IgnitionEx.java:1831) [ignite-core-2.7.5-0-2.jar:2.7.5] at org.apache.ignite.internal.IgnitionEx$IgniteNamedInstance$2.apply(IgnitionEx.java:1826) [ignite-core-2.7.5-0-2.jar:2.7.5] at org.apache.ignite.internal.worker.WorkersRegistry.onIdle(WorkersRegistry.java:233) [ignite-core-2.7.5-0-2.jar:2.7.5] at org.apache.ignite.internal.util.worker.GridWorker.onIdle(GridWorker.java:297) [ignite-core-2.7.5-0-2.jar:2.7.5] at org.apache.ignite.internal.processors.timeout.GridTimeoutProcessor$TimeoutWorker.body(GridTimeoutProcessor.java:221) [ignite-core-2.7.5-0-2.jar:2.7.5] at org.apache.ignite.internal.util.worker.GridWorker.run(GridWorker.java:120) [ignite-core-2.7.5-0-2.jar:2.7.5] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_172] There was very high GC activity seen at that time ~ 15:10, so that would explain the last part. But this kept going on and on until it went into a tailspin with the below logs 2019-09-19 17:34:27.550 [WARN ] [zk-null-EventThread] ZookeeperClient - Failed to execute ZooKeeper operation [err=org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for / apacheIgnite/cassgrid-nj/cp/389e297a-e3f5-4735-9194-5caaa14f8eb7:34d021e7-3f7e-4cc8-83aa-adad0de00553:0000, state=Disconnected] 2019-09-19 17:34:27.550 [WARN ] [zk-null-EventThread] ZookeeperClient - ZooKeeper operation failed, will retry [err=org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /apacheIgnite/cassgrid-nj/cp/389e297a-e3f5-4735-9194-5caaa14f8eb7:34d021e7-3f7e-4cc8-83aa-adad0de00553:0000, retryTimeout=2000, connLossTimeout=30000, path=/apacheIgnite/cassgrid-nj/cp/389e297a-e3f5-4735-9194-5caaa1 4f8eb7:34d021e7-3f7e-4cc8-83aa-adad0de00553:0000, remainingWaitTime=20335] 2019-09-19 17:34:27.550 [WARN ] [data-streamer-stripe-41-#96] ZookeeperClient - Failed to execute ZooKeeper operation [err=org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLo ss for /apacheIgnite/cassgrid-nj/cp/d284ad22-03c4-4281-9221-6eddad9bf313:0c643dd0-a884-4fd0-acb3-a6d7e2c5e71d:0001, state=Disconnected] 2019-09-19 17:34:27.550 [ERROR] [data-streamer-stripe-41-#96] ZookeeperClient - Operation failed with unexpected error, close ZooKeeper client: org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErr orCode = ConnectionLoss for /apacheIgnite/cassgrid-nj/cp/d284ad22-03c4-4281-9221-6eddad9bf313:0c643dd0-a884-4fd0-acb3-a6d7e2c5e71d:0001 org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode = ConnectionLoss for /apacheIgnite/cassgrid-nj/cp/d284ad22-03c4-4281-9221-6eddad9bf313:0c643dd0-a884-4fd0-acb3-a6d7e2c5e71d:0001 at org.apache.zookeeper.KeeperException.create(KeeperException.java:102) ~[zookeeper-3.4.13.jar:3.4.13-2d71af4dbe22557fda74f9a9b4309b15a7487f03] at org.apache.zookeeper.KeeperException.create(KeeperException.java:54) ~[zookeeper-3.4.13.jar:3.4.13-2d71af4dbe22557fda74f9a9b4309b15a7487f03] at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:792) ~[zookeeper-3.4.13.jar:3.4.13-2d71af4dbe22557fda74f9a9b4309b15a7487f03] at org.apache.ignite.spi.discovery.zk.internal.ZookeeperClient.createIfNeeded(ZookeeperClient.java:443) [ignite-zookeeper-2.7.5.jar:2.7.5] at org.apache.ignite.spi.discovery.zk.internal.ZookeeperDiscoveryImpl.saveMultipleParts(ZookeeperDiscoveryImpl.java:939) [ignite-zookeeper-2.7.5.jar:2.7.5] at org.apache.ignite.spi.discovery.zk.internal.ZookeeperDiscoveryImpl.saveCustomMessage(ZookeeperDiscoveryImpl.java:671) [ignite-zookeeper-2.7.5.jar:2.7.5] at org.apache.ignite.spi.discovery.zk.internal.ZookeeperDiscoveryImpl.sendCustomMessage(ZookeeperDiscoveryImpl.java:629) [ignite-zookeeper-2.7.5.jar:2.7.5] at org.apache.ignite.spi.discovery.zk.ZookeeperDiscoverySpi.sendCustomEvent(ZookeeperDiscoverySpi.java:414) [ignite-zookeeper-2.7.5.jar:2.7.5] at org.apache.ignite.internal.managers.discovery.GridDiscoveryManager.sendCustomEvent(GridDiscoveryManager.java:2207) [ignite-core-2.7.5-0-2.jar:2.7.5] at org.apache.ignite.internal.processors.cache.binary.BinaryMetadataTransport.requestMetadataUpdate(BinaryMetadataTransport.java:170) [ignite-core-2.7.5-0-2.jar:2.7.5] at org.apache.ignite.internal.processors.cache.binary.CacheObjectBinaryProcessorImpl.addMeta(CacheObjectBinaryProcessorImpl.java:469) [ignite-core-2.7.5-0-2.jar:2.7.5] at org.apache.ignite.internal.processors.cache.binary.CacheObjectBinaryProcessorImpl$2.addMeta(CacheObjectBinaryProcessorImpl.java:186) [ignite-core-2.7.5-0-2.jar:2.7.5] at org.apache.ignite.internal.binary.BinaryContext.updateMetadata(BinaryContext.java:1332) [ignite-core-2.7.5-0-2.jar:2.7.5] at org.apache.ignite.internal.binary.builder.BinaryObjectBuilderImpl.serializeTo(BinaryObjectBuilderImpl.java:369) [ignite-core-2.7.5-0-2.jar:2.7.5] at org.apache.ignite.internal.binary.builder.BinaryObjectBuilderImpl.build(BinaryObjectBuilderImpl.java:190) [ignite-core-2.7.5-0-2.jar:2.7.5] at com.bloomberg.fdns.cass.ignition.datareader.CassStreamReceiver.receive(CassStreamReceiver.java:42) [datagrid-cass-dependencies.jar:?] at org.apache.ignite.internal.processors.datastreamer.DataStreamerUpdateJob.call(DataStreamerUpdateJob.java:137) [ignite-core-2.7.5-0-2.jar:2.7.5] at org.apache.ignite.internal.processors.datastreamer.DataStreamProcessor.localUpdate(DataStreamProcessor.java:400) [ignite-core-2.7.5-0-2.jar:2.7.5] .... 2019-09-19 17:34:27.686 [WARN ] [data-streamer-stripe-41-#96] ZookeeperDiscoveryImpl - Connection to Zookeeper server is lost, local node SEGMENTED. 2019-09-19 17:34:27.687 [WARN ] [disco-event-worker-#175] GridDiscoveryManager - Local node SEGMENTED: ZookeeperClusterNode [id=0c643dd0-a884-4fd0-acb3-a6d7e2c5e71d, addrs=[10.115.248.110, 10.126.230.37, 127.0.0.1], order=109, loc=true, client=false] 2019-09-19 17:34:27.688 [ERROR] [disco-event-worker-#175] - Critical system error detected. Will be handled accordingly to configured handler [hnd=StopNodeFailureHandler [super=AbstractFailureHandler [ignoredFailur eTypes=[SYSTEM_WORKER_BLOCKED, SYSTEM_CRITICAL_OPERATION_TIMEOUT]]], failureCtx=FailureContext [type=SEGMENTATION, err=null]] Any help in understanding what triggered these series of event will be very helpful. Thanks, Abhishek