reallax opened a new issue #1251: upgrade RocketMQ from 4.1.0 to 4.5.0 failed URL: https://github.com/apache/rocketmq/issues/1251 1. Please describe the issue you observed: I'm trying to upgrade RocketMQ version from 4.1.0 to 4.5.0 without MQ service downtime, without data losing. I refer to the operation: https://github.com/apache/rocketmq/blob/store_with_dledger/docs/cn/dledger/deploy_guide.md. When I stop a old broker group (4.1.0, M/S), and start a new broker group (4.5.0, dledger) , the new broker group can not start up without any error. - What did you do (The steps to reproduce)? old broker group: broker-o, and the configuration as below: brokerClusterName=rmq_version_upgrade_test brokerName=broker-o brokerId=0 namesrvAddr=10.12.192.xx:9876 storePathRootDir=/home/data/rmq420/rocketmq-o/store storePathCommitLog=/home/data/rmq420/rocketmq-o/store/commitlog storePathConsumeQueue=/home/data/rmq420/rocketmq-o/store/consumequeue storePathIndex=/home/data/rmq420/rocketmq-o/store/index storeCheckpoint=/home/data/rmq420/rocketmq-o/store/checkpoint abortFile=/home/data/rmq420/rocketmq-o/store/abort stop old broker group (broker-o). prepare new broker group, still broker-o, configuration as below: brokerClusterName = rmq_version_upgrade_test brokerName=broker-o listenPort=30911 namesrvAddr=10.12.192.xx:9876 storePathRootDir=/home/data/rmq420/rocketmq-o/store storePathCommitLog=/home/data/rmq420/rocketmq-o/store/commitlog enableDLegerCommitLog=true dLegerGroup=broker-o dLegerPeers=n0-10.12.192.X1:40911;n1-10.12.192.X2:40911;n2-10.12.192.X3:40911 ## must be unique dLegerSelfId=n0 sendMessageThreadPoolNums=4 start new broker group, the process (RocketMQ 4.5.0) exit quickly without error log. - What did you expect to see? new broker group in version of 4.5.0 can start up and working properly. - What did you see instead? the process (RocketMQ 4.5.0) exit quickly without error log. broker.log as below: `2019-06-10 14:28:51 INFO main - rocketmqHome=/home/rmq_version_upgrade_test/rmq450/rocketmq-4.5.1-o 2019-06-10 14:28:51 INFO main - namesrvAddr=10.12.192.51:9876 2019-06-10 14:28:51 INFO main - brokerIP1=10.12.192.51 2019-06-10 14:28:51 INFO main - brokerIP2=10.12.192.51 2019-06-10 14:28:51 INFO main - brokerName=broker-o 2019-06-10 14:28:51 INFO main - brokerClusterName=rmq_version_upgrade_test 2019-06-10 14:28:51 INFO main - brokerId=0 2019-06-10 14:28:51 INFO main - brokerPermission=6 2019-06-10 14:28:51 INFO main - defaultTopicQueueNums=8 2019-06-10 14:28:51 INFO main - autoCreateTopicEnable=true 2019-06-10 14:28:51 INFO main - clusterTopicEnable=true 2019-06-10 14:28:51 INFO main - brokerTopicEnable=true 2019-06-10 14:28:51 INFO main - autoCreateSubscriptionGroup=true 2019-06-10 14:28:51 INFO main - messageStorePlugIn= 2019-06-10 14:28:51 INFO main - msgTraceTopicName=RMQ_SYS_TRACE_TOPIC 2019-06-10 14:28:51 INFO main - traceTopicEnable=false 2019-06-10 14:28:51 INFO main - sendMessageThreadPoolNums=4 2019-06-10 14:28:51 INFO main - pullMessageThreadPoolNums=24 2019-06-10 14:28:51 INFO main - queryMessageThreadPoolNums=12 2019-06-10 14:28:51 INFO main - adminBrokerThreadPoolNums=16 2019-06-10 14:28:51 INFO main - clientManageThreadPoolNums=32 2019-06-10 14:28:51 INFO main - consumerManageThreadPoolNums=32 2019-06-10 14:28:51 INFO main - heartbeatThreadPoolNums=4 2019-06-10 14:28:51 INFO main - endTransactionThreadPoolNums=16 2019-06-10 14:28:51 INFO main - flushConsumerOffsetInterval=5000 2019-06-10 14:28:51 INFO main - flushConsumerOffsetHistoryInterval=60000 2019-06-10 14:28:51 INFO main - rejectTransactionMessage=false 2019-06-10 14:28:51 INFO main - fetchNamesrvAddrByAddressServer=false 2019-06-10 14:28:51 INFO main - sendThreadPoolQueueCapacity=10000 2019-06-10 14:28:51 INFO main - pullThreadPoolQueueCapacity=100000 2019-06-10 14:28:51 INFO main - queryThreadPoolQueueCapacity=20000 2019-06-10 14:28:51 INFO main - clientManagerThreadPoolQueueCapacity=1000000 2019-06-10 14:28:51 INFO main - consumerManagerThreadPoolQueueCapacity=1000000 2019-06-10 14:28:51 INFO main - heartbeatThreadPoolQueueCapacity=50000 2019-06-10 14:28:51 INFO main - endTransactionPoolQueueCapacity=100000 2019-06-10 14:28:51 INFO main - filterServerNums=0 2019-06-10 14:28:51 INFO main - longPollingEnable=true 2019-06-10 14:28:51 INFO main - shortPollingTimeMills=1000 2019-06-10 14:28:51 INFO main - notifyConsumerIdsChangedEnable=true 2019-06-10 14:28:51 INFO main - highSpeedMode=false 2019-06-10 14:28:51 INFO main - commercialEnable=true 2019-06-10 14:28:51 INFO main - commercialTimerCount=1 2019-06-10 14:28:51 INFO main - commercialTransCount=1 2019-06-10 14:28:51 INFO main - commercialBigCount=1 2019-06-10 14:28:51 INFO main - commercialBaseCount=1 2019-06-10 14:28:51 INFO main - transferMsgByHeap=true 2019-06-10 14:28:51 INFO main - maxDelayTime=40 2019-06-10 14:28:51 INFO main - regionId=DefaultRegion 2019-06-10 14:28:51 INFO main - registerBrokerTimeoutMills=6000 2019-06-10 14:28:51 INFO main - slaveReadEnable=false 2019-06-10 14:28:51 INFO main - disableConsumeIfConsumerReadSlowly=false 2019-06-10 14:28:51 INFO main - consumerFallbehindThreshold=17179869184 2019-06-10 14:28:51 INFO main - brokerFastFailureEnable=true 2019-06-10 14:28:51 INFO main - waitTimeMillsInSendQueue=200 2019-06-10 14:28:51 INFO main - waitTimeMillsInPullQueue=5000 2019-06-10 14:28:51 INFO main - waitTimeMillsInHeartbeatQueue=31000 2019-06-10 14:28:51 INFO main - waitTimeMillsInTransactionQueue=3000 2019-06-10 14:28:51 INFO main - startAcceptSendRequestTimeStamp=0 2019-06-10 14:28:51 INFO main - traceOn=true 2019-06-10 14:28:51 INFO main - enableCalcFilterBitMap=false 2019-06-10 14:28:51 INFO main - expectConsumerNumUseFilter=32 2019-06-10 14:28:51 INFO main - maxErrorRateOfBloomFilter=20 2019-06-10 14:28:51 INFO main - filterDataCleanTimeSpan=86400000 2019-06-10 14:28:51 INFO main - filterSupportRetry=false 2019-06-10 14:28:51 INFO main - enablePropertyFilter=false 2019-06-10 14:28:51 INFO main - compressedRegister=false 2019-06-10 14:28:51 INFO main - forceRegister=true 2019-06-10 14:28:51 INFO main - registerNameServerPeriod=30000 2019-06-10 14:28:51 INFO main - transactionTimeOut=6000 2019-06-10 14:28:51 INFO main - transactionCheckMax=15 2019-06-10 14:28:51 INFO main - transactionCheckInterval=60000 2019-06-10 14:28:51 INFO main - aclEnable=false 2019-06-10 14:28:51 INFO main - listenPort=30911 2019-06-10 14:28:51 INFO main - serverWorkerThreads=8 2019-06-10 14:28:51 INFO main - serverCallbackExecutorThreads=0 2019-06-10 14:28:51 INFO main - serverSelectorThreads=3 2019-06-10 14:28:51 INFO main - serverOnewaySemaphoreValue=256 2019-06-10 14:28:51 INFO main - serverAsyncSemaphoreValue=64 2019-06-10 14:28:51 INFO main - serverChannelMaxIdleTimeSeconds=120 2019-06-10 14:28:51 INFO main - serverSocketSndBufSize=131072 2019-06-10 14:28:51 INFO main - serverSocketRcvBufSize=131072 2019-06-10 14:28:51 INFO main - serverPooledByteBufAllocatorEnable=true 2019-06-10 14:28:51 INFO main - useEpollNativeSelector=false 2019-06-10 14:28:51 INFO main - clientWorkerThreads=4 2019-06-10 14:28:51 INFO main - clientCallbackExecutorThreads=4 2019-06-10 14:28:51 INFO main - clientOnewaySemaphoreValue=65535 2019-06-10 14:28:51 INFO main - clientAsyncSemaphoreValue=65535 2019-06-10 14:28:51 INFO main - connectTimeoutMillis=3000 2019-06-10 14:28:51 INFO main - channelNotActiveInterval=60000 2019-06-10 14:28:51 INFO main - clientChannelMaxIdleTimeSeconds=120 2019-06-10 14:28:51 INFO main - clientSocketSndBufSize=131072 2019-06-10 14:28:51 INFO main - clientSocketRcvBufSize=131072 2019-06-10 14:28:51 INFO main - clientPooledByteBufAllocatorEnable=false 2019-06-10 14:28:51 INFO main - clientCloseSocketIfTimeout=false 2019-06-10 14:28:51 INFO main - useTLS=false 2019-06-10 14:28:51 INFO main - storePathRootDir=/home/data/rmq420/rocketmq-o/store 2019-06-10 14:28:51 INFO main - storePathCommitLog=/home/data/rmq420/rocketmq-o/store/commitlog 2019-06-10 14:28:51 INFO main - mapedFileSizeCommitLog=1073741824 2019-06-10 14:28:51 INFO main - mapedFileSizeConsumeQueue=6000000 2019-06-10 14:28:51 INFO main - enableConsumeQueueExt=false 2019-06-10 14:28:51 INFO main - mappedFileSizeConsumeQueueExt=50331648 2019-06-10 14:28:51 INFO main - bitMapLengthConsumeQueueExt=64 2019-06-10 14:28:51 INFO main - flushIntervalCommitLog=500 2019-06-10 14:28:51 INFO main - commitIntervalCommitLog=200 2019-06-10 14:28:51 INFO main - useReentrantLockWhenPutMessage=false 2019-06-10 14:28:51 INFO main - flushCommitLogTimed=false 2019-06-10 14:28:51 INFO main - flushIntervalConsumeQueue=1000 2019-06-10 14:28:51 INFO main - cleanResourceInterval=10000 2019-06-10 14:28:51 INFO main - deleteCommitLogFilesInterval=100 2019-06-10 14:28:51 INFO main - deleteConsumeQueueFilesInterval=100 2019-06-10 14:28:51 INFO main - destroyMapedFileIntervalForcibly=120000 2019-06-10 14:28:51 INFO main - redeleteHangedFileInterval=120000 2019-06-10 14:28:51 INFO main - deleteWhen=04 2019-06-10 14:28:51 INFO main - diskMaxUsedSpaceRatio=75 2019-06-10 14:28:51 INFO main - fileReservedTime=72 2019-06-10 14:28:51 INFO main - putMsgIndexHightWater=600000 2019-06-10 14:28:51 INFO main - maxMessageSize=4194304 2019-06-10 14:28:51 INFO main - checkCRCOnRecover=true 2019-06-10 14:28:51 INFO main - flushCommitLogLeastPages=4 2019-06-10 14:28:51 INFO main - commitCommitLogLeastPages=4 2019-06-10 14:28:51 INFO main - flushLeastPagesWhenWarmMapedFile=4096 2019-06-10 14:28:51 INFO main - flushConsumeQueueLeastPages=2 2019-06-10 14:28:51 INFO main - flushCommitLogThoroughInterval=10000 2019-06-10 14:28:51 INFO main - commitCommitLogThoroughInterval=200 2019-06-10 14:28:51 INFO main - flushConsumeQueueThoroughInterval=60000 2019-06-10 14:28:51 INFO main - maxTransferBytesOnMessageInMemory=262144 2019-06-10 14:28:51 INFO main - maxTransferCountOnMessageInMemory=32 2019-06-10 14:28:51 INFO main - maxTransferBytesOnMessageInDisk=65536 2019-06-10 14:28:51 INFO main - maxTransferCountOnMessageInDisk=8 2019-06-10 14:28:51 INFO main - accessMessageInMemoryMaxRatio=40 2019-06-10 14:28:51 INFO main - messageIndexEnable=true 2019-06-10 14:28:51 INFO main - maxHashSlotNum=5000000 2019-06-10 14:28:51 INFO main - maxIndexNum=20000000 2019-06-10 14:28:51 INFO main - maxMsgsNumBatch=64 2019-06-10 14:28:51 INFO main - messageIndexSafe=false 2019-06-10 14:28:51 INFO main - haListenPort=30912 2019-06-10 14:28:51 INFO main - haSendHeartbeatInterval=5000 2019-06-10 14:28:51 INFO main - haHousekeepingInterval=20000 2019-06-10 14:28:51 INFO main - haTransferBatchSize=32768 2019-06-10 14:28:51 INFO main - haMasterAddress= 2019-06-10 14:28:51 INFO main - haSlaveFallbehindMax=268435456 2019-06-10 14:28:51 INFO main - brokerRole=ASYNC_MASTER 2019-06-10 14:28:51 INFO main - flushDiskType=ASYNC_FLUSH 2019-06-10 14:28:51 INFO main - syncFlushTimeout=5000 2019-06-10 14:28:51 INFO main - messageDelayLevel=1s 5s 10s 30s 1m 2m 3m 4m 5m 6m 7m 8m 9m 10m 20m 30m 1h 2h 2019-06-10 14:28:51 INFO main - flushDelayOffsetInterval=10000 2019-06-10 14:28:51 INFO main - cleanFileForciblyEnable=true 2019-06-10 14:28:51 INFO main - warmMapedFileEnable=false 2019-06-10 14:28:51 INFO main - offsetCheckInSlave=false 2019-06-10 14:28:51 INFO main - debugLockEnable=false 2019-06-10 14:28:51 INFO main - duplicationEnable=false 2019-06-10 14:28:51 INFO main - diskFallRecorded=true 2019-06-10 14:28:51 INFO main - osPageCacheBusyTimeOutMills=1000 2019-06-10 14:28:51 INFO main - defaultQueryMaxNum=32 2019-06-10 14:28:51 INFO main - transientStorePoolEnable=false 2019-06-10 14:28:51 INFO main - transientStorePoolSize=5 2019-06-10 14:28:51 INFO main - fastFailIfNoBufferInStorePool=false 2019-06-10 14:28:51 INFO main - enableDLegerCommitLog=true 2019-06-10 14:28:51 INFO main - dLegerGroup=broker-o 2019-06-10 14:28:51 INFO main - dLegerPeers=n0-10.12.192.51:40911;n1-10.12.192.52:40911;n2-10.12.192.53:40911 2019-06-10 14:28:51 INFO main - dLegerSelfId=n0 2019-06-10 14:28:52 INFO main - load exist local topic, TopicConfig [topicName=rmq_version_upgrade_test, readQueueNums=16, writeQueueNums=16, perm=RWX, topicFilterType=SINGLE_TAG, topicSysFlag=0, order=false] 2019-06-10 14:28:52 INFO main - load exist local topic, TopicConfig [topicName=nrkt_rmq_version_upgrade_test_3_local, readQueueNums=4, writeQueueNums=4, perm=RW-, topicFilterType=SINGLE_TAG, topicSysFlag=0, order=false] 2019-06-10 14:28:52 INFO main - load exist local topic, TopicConfig [topicName=BenchmarkTest, readQueueNums=1024, writeQueueNums=1024, perm=RW-, topicFilterType=SINGLE_TAG, topicSysFlag=0, order=false] 2019-06-10 14:28:52 INFO main - load exist local topic, TopicConfig [topicName=OFFSET_MOVED_EVENT, readQueueNums=1, writeQueueNums=1, perm=RW-, topicFilterType=SINGLE_TAG, topicSysFlag=0, order=false] 2019-06-10 14:28:52 INFO main - load exist local topic, TopicConfig [topicName=TBW102, readQueueNums=4, writeQueueNums=4, perm=RWX, topicFilterType=SINGLE_TAG, topicSysFlag=0, order=false] 2019-06-10 14:28:52 INFO main - load exist local topic, TopicConfig [topicName=broker-o, readQueueNums=1, writeQueueNums=1, perm=RWX, topicFilterType=SINGLE_TAG, topicSysFlag=0, order=false] 2019-06-10 14:28:52 INFO main - load exist local topic, TopicConfig [topicName=SELF_TEST_TOPIC, readQueueNums=1, writeQueueNums=1, perm=RW-, topicFilterType=SINGLE_TAG, topicSysFlag=0, order=false] 2019-06-10 14:28:52 INFO main - load exist local topic, TopicConfig [topicName=nrkt_rmq_version_upgrade_test_1_local, readQueueNums=4, writeQueueNums=4, perm=RW-, topicFilterType=SINGLE_TAG, topicSysFlag=0, order=false] 2019-06-10 14:28:52 INFO main - load exist local topic, TopicConfig [topicName=%RETRY%group_dmg_api-nrkt_rmq_version_upgrade_test_3_local, readQueueNums=1, writeQueueNums=1, perm=RW-, topicFilterType=SINGLE_TAG, topicSysFlag=0, order=false] 2019-06-10 14:28:52 INFO main - load exist local topic, TopicConfig [topicName=nrkt_rmq_version_upgrade_test_2_local, readQueueNums=6, writeQueueNums=6, perm=RW-, topicFilterType=SINGLE_TAG, topicSysFlag=0, order=false] 2019-06-10 14:28:52 INFO main - load exist local topic, TopicConfig [topicName=%RETRY%group_dmg_sdk_example-nrkt_rmq_version_upgrade_test_2_local, readQueueNums=1, writeQueueNums=1, perm=RW-, topicFilterType=SINGLE_TAG, topicSysFlag=0, order=false] 2019-06-10 14:28:52 INFO main - load exist local topic, TopicConfig [topicName=%RETRY%group_dmg_sdk_tool-nrkt_rmq_version_upgrade_test_1_local, readQueueNums=1, writeQueueNums=1, perm=RW-, topicFilterType=SINGLE_TAG, topicSysFlag=0, order=false] 2019-06-10 14:28:52 INFO main - load /home/data/rmq420/rocketmq-o/store/config/topics.json OK 2019-06-10 14:28:52 INFO main - load /home/data/rmq420/rocketmq-o/store/config/consumerOffset.json OK 2019-06-10 14:28:52 INFO main - load exist subscription group, SubscriptionGroupConfig [groupName=SELF_TEST_C_GROUP, consumeEnable=true, consumeFromMinEnable=true, consumeBroadcastEnable=true, retryQueueNums=1, retryMaxTimes=16, brokerId=0, whichBrokerWhenConsumeSlowly=1, notifyConsumerIdsChangedEnable=true] 2019-06-10 14:28:52 INFO main - load exist subscription group, SubscriptionGroupConfig [groupName=group_dmg_sdk_tool-nrkt_rmq_version_upgrade_test_1_local, consumeEnable=true, consumeFromMinEnable=true, consumeBroadcastEnable=true, retryQueueNums=1, retryMaxTimes=16, brokerId=0, whichBrokerWhenConsumeSlowly=1, notifyConsumerIdsChangedEnable=true] 2019-06-10 14:28:52 INFO main - load exist subscription group, SubscriptionGroupConfig [groupName=CID_ONSAPI_OWNER, consumeEnable=true, consumeFromMinEnable=true, consumeBroadcastEnable=true, retryQueueNums=1, retryMaxTimes=16, brokerId=0, whichBrokerWhenConsumeSlowly=1, notifyConsumerIdsChangedEnable=true] 2019-06-10 14:28:52 INFO main - load exist subscription group, SubscriptionGroupConfig [groupName=group_dmg_sdk_example-nrkt_rmq_version_upgrade_test_2_local, consumeEnable=true, consumeFromMinEnable=true, consumeBroadcastEnable=true, retryQueueNums=1, retryMaxTimes=16, brokerId=0, whichBrokerWhenConsumeSlowly=1, notifyConsumerIdsChangedEnable=true] 2019-06-10 14:28:52 INFO main - load exist subscription group, SubscriptionGroupConfig [groupName=CID_ONSAPI_PERMISSION, consumeEnable=true, consumeFromMinEnable=true, consumeBroadcastEnable=true, retryQueueNums=1, retryMaxTimes=16, brokerId=0, whichBrokerWhenConsumeSlowly=1, notifyConsumerIdsChangedEnable=true] 2019-06-10 14:28:52 INFO main - load exist subscription group, SubscriptionGroupConfig [groupName=group_dmg_api-nrkt_rmq_version_upgrade_test_3_local, consumeEnable=true, consumeFromMinEnable=true, consumeBroadcastEnable=true, retryQueueNums=1, retryMaxTimes=16, brokerId=0, whichBrokerWhenConsumeSlowly=1, notifyConsumerIdsChangedEnable=true] 2019-06-10 14:28:52 INFO main - load exist subscription group, SubscriptionGroupConfig [groupName=TOOLS_CONSUMER, consumeEnable=true, consumeFromMinEnable=true, consumeBroadcastEnable=true, retryQueueNums=1, retryMaxTimes=16, brokerId=0, whichBrokerWhenConsumeSlowly=1, notifyConsumerIdsChangedEnable=true] 2019-06-10 14:28:52 INFO main - load exist subscription group, SubscriptionGroupConfig [groupName=CID_ONS-HTTP-PROXY, consumeEnable=true, consumeFromMinEnable=true, consumeBroadcastEnable=true, retryQueueNums=1, retryMaxTimes=16, brokerId=0, whichBrokerWhenConsumeSlowly=1, notifyConsumerIdsChangedEnable=true] 2019-06-10 14:28:52 INFO main - load exist subscription group, SubscriptionGroupConfig [groupName=FILTERSRV_CONSUMER, consumeEnable=true, consumeFromMinEnable=true, consumeBroadcastEnable=true, retryQueueNums=1, retryMaxTimes=16, brokerId=0, whichBrokerWhenConsumeSlowly=1, notifyConsumerIdsChangedEnable=true] 2019-06-10 14:28:52 INFO main - load exist subscription group, SubscriptionGroupConfig [groupName=CID_ONSAPI_PULL, consumeEnable=true, consumeFromMinEnable=true, consumeBroadcastEnable=true, retryQueueNums=1, retryMaxTimes=16, brokerId=0, whichBrokerWhenConsumeSlowly=1, notifyConsumerIdsChangedEnable=true] 2019-06-10 14:28:52 INFO main - load /home/data/rmq420/rocketmq-o/store/config/subscriptionGroup.json OK 2019-06-10 14:28:52 INFO main - load /home/data/rmq420/rocketmq-o/store/config/consumerFilter.json OK 2019-06-10 14:28:52 INFO main - Try to start service thread:AllocateMappedFileService started:false lastThread:null 2019-06-10 14:28:52 INFO main - load /home/data/rmq420/rocketmq-o/store/config/delayOffset.json OK 2019-06-10 14:28:52 INFO main - Try to shutdown service thread:AllocateMappedFileService started:true lastThread:Thread[AllocateMappedFileService,5,main] 2019-06-10 14:28:52 INFO main - shutdown thread AllocateMappedFileService interrupt true 2019-06-10 14:28:52 INFO main - join thread AllocateMappedFileService eclipse time(ms) 0 90000 2019-06-10 14:28:52 INFO main - Try to shutdown service thread:PullRequestHoldService started:false lastThread:null` 2. Please tell us about your environment: `CentOS Linux release 7.6.1810 (Core) Derived from Red Hat Enterprise Linux 7.6 (Source) NAME="CentOS Linux" VERSION="7 (Core)" ID="centos" ID_LIKE="rhel fedora" VERSION_ID="7" PRETTY_NAME="CentOS Linux 7 (Core)" ANSI_COLOR="0;31" CPE_NAME="cpe:/o:centos:centos:7" HOME_URL="https://www.centos.org/"; BUG_REPORT_URL="https://bugs.centos.org/"; CENTOS_MANTISBT_PROJECT="CentOS-7" CENTOS_MANTISBT_PROJECT_VERSION="7" REDHAT_SUPPORT_PRODUCT="centos" REDHAT_SUPPORT_PRODUCT_VERSION="7" CentOS Linux release 7.6.1810 (Core) CentOS Linux release 7.6.1810 (Core) cpe:/o:centos:centos:7` java version: JDK 1.8.0_60 3. my expectations: Maybe my configuration has some problem, but there is no error in logs, I'm confused. So any one can give a detail config demo, to explain version upgrade (from architecture M/S to Dledfer) more clearer.
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