DM8环境DSC集群故障模拟及日志分析

2024-04-29 04:32
文章标签 分析 集群 日志 环境 dsc dm8 故障模拟

本文主要是介绍DM8环境DSC集群故障模拟及日志分析，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

上一节中讲到了DSC集群的服务管理和备份还原，这节对DSC集群的故障处理过程进行探讨。
首先，看一下实例环境中的数据库实例情况：

SQL> select * from v$instance;LINEID     NAME INSTANCE_NAME INSTANCE_NUMBER HOST_NAME
---------- ---- ------------- --------------- ---------SVR_VERSION                DB_VERSION         -------------------------- -------------------START_TIME                                                                                          ----------------------------------------------------------------------------------------------------STATUS$ MODE$  OGUID       DSC_SEQNO   DSC_ROLE    ------- ------ ----------- ----------- ------------
1          DSC0 DSC0          1               dcs0DM Database Server x64 V8  DB Version: 0x7000a2021-05-01 23:05:12OPEN    NORMAL 0           0           Control nodeused time: 76.219(ms). Execute id is 4.

在名为DSC0的实例中，该实例状态正常，目前为集群控制节点，查一下另外的实例情况：

SQL> select * from v$instance;LINEID     NAME INSTANCE_NAME INSTANCE_NUMBER HOST_NAME SVR_VERSION                DB_VERSION         
---------- ---- ------------- --------------- --------- -------------------------- -------------------START_TIME                                                                                           STATUS$---------------------------------------------------------------------------------------------------- -------MODE$  OGUID       DSC_SEQNO   DSC_ROLE   ------ ----------- ----------- -----------
1          DSC1 DSC1          2               dcs1      DM Database Server x64 V8  DB Version: 0x7000a2021-05-01 23:04:54                                                                                  OPENNORMAL 0           1           Normal nodeused time: 148.055(ms). Execute id is 1.

名为DSC1的实例状态也是正常的，目前为普通节点，下面模拟故障，通过系统KILL命令将实例进程强杀，确认实例进程已经不存在了，过程如下图所示：
在这里插入图片描述
在DISQL中进一步确认实例状态，此时DSC0中的DISQL已失去连接，在DSC1中的DISQL中查询实例，显示其状态已经切换为控制节点，如下：

SQL> select * from v$instance;LINEID     NAME INSTANCE_NAME INSTANCE_NUMBER HOST_NAME SVR_VERSION               
---------- ---- ------------- --------------- --------- --------------------------DB_VERSION         -------------------START_TIME                                                                                          ----------------------------------------------------------------------------------------------------STATUS$ MODE$  OGUID       DSC_SEQNO   DSC_ROLE    ------- ------ ----------- ----------- ------------
1          DSC1 DSC1          2               dcs1      DM Database Server x64 V8 DB Version: 0x7000a2021-05-01 23:04:54OPEN    NORMAL 0           1           Control node
used time: 1.152(ms). Execute id is 2.

分析日志文件中的详细过程，查看集群日志文件中的记录
cat dm_CSS0_202105.log

2021-05-01 23:50:16.096 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Detected EP DSC0[0] break in PROCESS_OPEN
2021-05-01 23:50:16.099 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Set EP DSC0[0] as break EP
2021-05-01 23:50:16.105 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (OPEN, STARTUP) to (PROCESS_EP_CRASH, CSS_SUB_STATUS_EP_CRASH_STEP1)
2021-05-01 23:50:16.105 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[0], break ep[0], recover ep[255], n_ok_ep[2]
2021-05-01 23:50:17.738 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Set EP DSC1[1] as Control node
2021-05-01 23:50:17.740 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd EP_CRASH_STEP1, dest_ep DSC1 seqno = 1, cmd_seq = 49
2021-05-01 23:50:17.748 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_EP_CRASH, CSS_SUB_STATUS_EP_CRASH_STEP1) to (PROCESS_EP_CRASH, CSS_SUB_STATUS_EP_CRASH_WAIT_STEP1)
2021-05-01 23:50:17.748 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[0], recover ep[255], n_ok_ep[1]
2021-05-01 23:50:18.754 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd NONE, dest_ep DSC1 seqno = 1, cmd_seq = 0
2021-05-01 23:50:18.759 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: cmd[EP_CRASH_STEP1] process over!
2021-05-01 23:50:18.765 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_EP_CRASH, CSS_SUB_STATUS_EP_CRASH_WAIT_STEP1) to (PROCESS_EP_CRASH, CSS_SUB_STATUS_EP_CRASH_STEP2)
2021-05-01 23:50:18.765 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[0], recover ep[255], n_ok_ep[1]
2021-05-01 23:50:19.770 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd EP_CRASH_STEP2, dest_ep DSC1 seqno = 1, cmd_seq = 52
2021-05-01 23:50:19.778 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_EP_CRASH, CSS_SUB_STATUS_EP_CRASH_STEP2) to (PROCESS_EP_CRASH, CSS_SUB_STATUS_EP_CRASH_WAIT_STEP2)
2021-05-01 23:50:19.778 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[0], recover ep[255], n_ok_ep[1]
2021-05-01 23:50:21.815 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd NONE, dest_ep DSC1 seqno = 1, cmd_seq = 0
2021-05-01 23:50:21.817 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: cmd[EP_CRASH_STEP2] process over!
2021-05-01 23:50:21.848 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_EP_CRASH, CSS_SUB_STATUS_EP_CRASH_WAIT_STEP2) to (PROCESS_EP_CRASH, SLAVE_CONFIG_VIP)
2021-05-01 23:50:21.848 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[0], recover ep[255], n_ok_ep[1]
2021-05-01 23:50:22.858 [ERROR] dmcss P0000000707 T0000000000000000766  [CSS]: css_vip_config(enp0s80, 192.168.56.121, 255.255.255.0, DOWN) failed
2021-05-01 23:50:22.865 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_EP_CRASH, SLAVE_CONFIG_VIP) to (PROCESS_EP_CRASH, WAIT_SLAVE_CONFIG_VIP)
2021-05-01 23:50:22.866 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[0], recover ep[255], n_ok_ep[1]
2021-05-01 23:50:23.925 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_EP_CRASH, WAIT_SLAVE_CONFIG_VIP) to (PROCESS_EP_CRASH, MASTER_CONFIG_VIP)
2021-05-01 23:50:23.925 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[0], recover ep[255], n_ok_ep[1]
2021-05-01 23:50:24.930 [INFO] dmcss P0000000707 T0000000000000000766  [CSS]: CSS set cmd CONFIG VIP, dest_ep CSS1 seqno = 1, cmd_seq = 3
2021-05-01 23:50:24.938 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_EP_CRASH, MASTER_CONFIG_VIP) to (PROCESS_EP_CRASH, WAIT_MASTER_CONFIG_VIP)
2021-05-01 23:50:24.939 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[0], recover ep[255], n_ok_ep[1]
2021-05-01 23:50:25.951 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_EP_CRASH, WAIT_MASTER_CONFIG_VIP) to (PROCESS_EP_CRASH, EP_CONFIG_VIP)
2021-05-01 23:50:25.951 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[0], recover ep[255], n_ok_ep[1]
2021-05-01 23:50:26.966 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd CONFIG VIP, dest_ep DSC1 seqno = 1, cmd_seq = 59
2021-05-01 23:50:26.975 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_EP_CRASH, EP_CONFIG_VIP) to (PROCESS_EP_CRASH, WAIT_EP_CONFIG_VIP)
2021-05-01 23:50:26.975 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[0], recover ep[255], n_ok_ep[1]
2021-05-01 23:50:27.980 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd NONE, dest_ep DSC1 seqno = 1, cmd_seq = 0
2021-05-01 23:50:27.984 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: cmd[CONFIG VIP] process over!
2021-05-01 23:50:27.991 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_EP_CRASH, WAIT_EP_CONFIG_VIP) to (OPEN, STARTUP)
2021-05-01 23:50:27.991 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[255], recover ep[255], n_ok_ep[1]

通过上面的记录可以看到，在我们将实例DSC0强行关闭后，dmcss进程立即检测到，并将该节点标记为故障节点，从正常开启状态切换为故障状态，选举DSC1实例为控制节点，并重新配置VIP，大致过程就是这样。
当我们再次启动DSC0实例后，通过DISQL查看实例状态：
在这里插入图片描述
可以看到，新加入的实例是普通节点，而原控制节点没有变化。查看故障实例启动后的日志，作以分析：

2021-05-01 23:57:25.354 [INFO] dmcss P0000000707 T0000000000000000766  css detect DB [DSC0] startup2
2021-05-01 23:57:25.354 [INFO] dmcss P0000000707 T0000000000000000766  css set DB [DSC0] guid [329285185]
2021-05-01 23:57:25.355 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Set EP DSC0[0] as recover EP
2021-05-01 23:57:25.364 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (OPEN, STARTUP) to (PROCESS_RECOVER, SUSPEND_WORKER)
2021-05-01 23:57:25.365 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[255], recover ep[0], n_ok_ep[1]
2021-05-01 23:57:25.392 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_RECOVER, SUSPEND_WORKER) to (PROCESS_RECOVER, WAIT_SUSPEND_WORKER)
2021-05-01 23:57:25.393 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[255], recover ep[0], n_ok_ep[1]
2021-05-01 23:57:25.394 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd START NOTIFY, dest_ep DSC0 seqno = 0, cmd_seq = 64
2021-05-01 23:57:26.403 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd SUSPEND EP WORKER THREAD, dest_ep DSC1 seqno = 1, cmd_seq = 65
2021-05-01 23:57:30.434 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Suspend ep worker thread is over!
2021-05-01 23:57:30.487 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd DCR_LOAD, dest_ep DSC0 seqno = 0, cmd_seq = 66
2021-05-01 23:57:30.490 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd DCR_LOAD, dest_ep DSC1 seqno = 1, cmd_seq = 67
2021-05-01 23:57:30.498 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_RECOVER, WAIT_SUSPEND_WORKER) to (PROCESS_RECOVER, CSS_SUB_STATUS_WAIT_DCR_LOAD)
2021-05-01 23:57:30.499 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[255], recover ep[0], n_ok_ep[2]
2021-05-01 23:57:31.509 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Error ep add is over!
2021-05-01 23:57:31.510 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd ERROR EP ADD, dest_ep DSC0 seqno = 0, cmd_seq = 69
2021-05-01 23:57:31.514 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd ERROR EP ADD, dest_ep DSC1 seqno = 1, cmd_seq = 70
2021-05-01 23:57:31.524 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_RECOVER, CSS_SUB_STATUS_WAIT_DCR_LOAD) to (PROCESS_RECOVER, SUB_WAIT_ERROR_EP_ADD)
2021-05-01 23:57:31.524 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[255], recover ep[0], n_ok_ep[2]
2021-05-01 23:57:32.554 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Error ep add is over!
2021-05-01 23:57:32.556 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd EP RECV, dest_ep DSC1 seqno = 1, cmd_seq = 72
2021-05-01 23:57:32.565 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_RECOVER, SUB_WAIT_ERROR_EP_ADD) to (PROCESS_RECOVER, WAIT_EP_RECOVER)
2021-05-01 23:57:32.565 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[255], recover ep[0], n_ok_ep[2]
2021-05-01 23:57:33.574 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Recover ep is over!
2021-05-01 23:57:33.580 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_RECOVER, WAIT_EP_RECOVER) to (PROCESS_RECOVER, EP_CONFIG_VIP)
2021-05-01 23:57:33.581 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[255], recover ep[0], n_ok_ep[2]
2021-05-01 23:57:33.584 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd CONFIG VIP, dest_ep DSC1 seqno = 1, cmd_seq = 75
2021-05-01 23:57:33.592 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_RECOVER, EP_CONFIG_VIP) to (PROCESS_RECOVER, WAIT_EP_CONFIG_VIP)
2021-05-01 23:57:33.593 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[255], recover ep[0], n_ok_ep[2]
2021-05-01 23:57:34.641 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd NONE, dest_ep DSC1 seqno = 1, cmd_seq = 0
2021-05-01 23:57:34.648 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_RECOVER, WAIT_EP_CONFIG_VIP) to (PROCESS_RECOVER, MASTER_CONFIG_VIP)
2021-05-01 23:57:34.648 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[255], recover ep[0], n_ok_ep[2]
2021-05-01 23:57:34.651 [INFO] dmcss P0000000707 T0000000000000000766  [CSS]: CSS set cmd CONFIG VIP, dest_ep CSS1 seqno = 1, cmd_seq = 4
2021-05-01 23:57:34.659 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_RECOVER, MASTER_CONFIG_VIP) to (PROCESS_RECOVER, WAIT_MASTER_CONFIG_VIP)
2021-05-01 23:57:34.659 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[255], recover ep[0], n_ok_ep[2]
2021-05-01 23:57:34.667 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_RECOVER, WAIT_MASTER_CONFIG_VIP) to (PROCESS_RECOVER, SLAVE_CONFIG_VIP)
2021-05-01 23:57:34.667 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[255], recover ep[0], n_ok_ep[2]
2021-05-01 23:57:34.672 [ERROR] dmcss P0000000707 T0000000000000000766  [CSS]: css_vip_config(enp0s80, 192.168.56.121, 255.255.255.0, UP) failed
2021-05-01 23:57:34.677 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_RECOVER, SLAVE_CONFIG_VIP) to (PROCESS_RECOVER, WAIT_SLAVE_CONFIG_VIP)
2021-05-01 23:57:34.677 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[255], recover ep[0], n_ok_ep[2]
2021-05-01 23:57:34.680 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd EP START, dest_ep DSC0 seqno = 0, cmd_seq = 81
2021-05-01 23:57:34.688 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_RECOVER, WAIT_SLAVE_CONFIG_VIP) to (PROCESS_RECOVER, WAIT_STARTUP)
2021-05-01 23:57:34.689 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[255], recover ep[0], n_ok_ep[2]
2021-05-01 23:57:35.700 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd EP START2, dest_ep DSC0 seqno = 0, cmd_seq = 83
2021-05-01 23:57:35.709 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_RECOVER, WAIT_STARTUP) to (PROCESS_RECOVER, AFTER_REDO)
2021-05-01 23:57:35.710 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[255], recover ep[0], n_ok_ep[2]
2021-05-01 23:57:37.723 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd EP OPEN, dest_ep DSC0 seqno = 0, cmd_seq = 85
2021-05-01 23:57:37.731 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_RECOVER, AFTER_REDO) to (PROCESS_RECOVER, WAIT_EP_OPEN)
2021-05-01 23:57:37.732 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[255], recover ep[0], n_ok_ep[2]
2021-05-01 23:57:38.741 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd NONE, dest_ep DSC0 seqno = 0, cmd_seq = 0
2021-05-01 23:57:38.746 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd RESUME EP WORKER THREAD, dest_ep DSC1 seqno = 1, cmd_seq = 87
2021-05-01 23:57:38.756 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_RECOVER, WAIT_EP_OPEN) to (PROCESS_RECOVER, WAIT_RESUME_WORKER)
2021-05-01 23:57:38.756 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[255], recover ep[0], n_ok_ep[2]
2021-05-01 23:57:39.765 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Resume ep worker thread is over!
2021-05-01 23:57:39.768 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd NONE, dest_ep DSC1 seqno = 1, cmd_seq = 0
2021-05-01 23:57:39.772 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd EP REAL OPEN, dest_ep DSC0 seqno = 0, cmd_seq = 89
2021-05-01 23:57:39.782 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_RECOVER, WAIT_RESUME_WORKER) to (PROCESS_RECOVER, WAIT_REAL_OPEN)
2021-05-01 23:57:39.783 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[255], recover ep[0], n_ok_ep[2]
2021-05-01 23:57:40.793 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: CSS set cmd NONE, dest_ep DSC0 seqno = 0, cmd_seq = 0
2021-05-01 23:57:40.808 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: status change from (PROCESS_RECOVER, WAIT_REAL_OPEN) to (OPEN, STARTUP)
2021-05-01 23:57:40.809 [INFO] dmcss P0000000707 T0000000000000000766  [DB]: Control Node[1], break ep[255], recover ep[255], n_ok_ep[2]

通过上面的日志可以看到，实例DSC0启动后即被CSS进程检测到，首先为DSC0设置了 guid，并设该节点为故障恢复节点，并启动恢复过程，CSS set cmd分别为 START NOTIFY，SUSPEND EP WORKER THREAD，DCR_LOAD，ERROR EP ADD，通过这一连串的步骤，故障节点加入到集群中来，然后CSS set cmd EP RECV，进程实例恢复，配置VIP，再经过CSS set cmd EP START，CSS set cmd EP OPEN，CSS set cmd EP REAL OPEN,原故障实例转为普通节点，可对外提供服务。
故障处理小结：
DMCSS 控制节点检测到实例故障后，首先向故障实例的Voting disk 区域写入 Kill 命令（所有实例一旦发现 Kill 命令，无条件自杀），避免故障实例仍然处于活动状态，引 发脑裂，然后启动故障处理流程，不同类型实例的故障处理流程存在一些差异。

DMCSS 控制节点故障处理流程

  1. 活动节点重新选举 DMCSS 控制节点
  2. 新的 DMCSS 控制节点通知出现 DMCSS 故障节点对应的 dmasmsvr、dmserver 强制退出

DMASMSVR 实例故障处理流程

  1. 挂起工作线程
  2. 更新 DCR 的节点故障节点信息
  3. 通知故障节点对应 dmserver 强制退出
  4. dmasmsvr 进行故障恢复
  5. 恢复工作线程

dmserver 实例故障处理流程

  1. 更新 DCR 故障节点信息
  2. 重新选取一个控制节点
  3. 通知 dmserver 控制节点启动故障处理流程（参考 DMDSC 故障处理）
  4. 等待 dmserver 故障处理结束
    节点重加入
    如果检测到故障节点恢复，DMCSS 会通知控制节点启动节点重加入流程。

数据库实例重加入

  1. 挂起工作线程
  2. 修改节点的状态
  3. 执行恢复操作
  4. 重新进入 STARTUP 状态，准备启动
  5. OPEN 重加入的节点
  6. 重启工作线程
  7. 执行 OPEN 数据库实例的操作

DMASM 实例重加入

  1. 挂起工作线程
  2. 修改节点的状态
  3. 执行恢复操作
  4. 重新进入 STARTUP 状态，准备启动
  5. OPEN 重加入的节点
  6. 重启工作线程

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《Nginx分布式部署流程分析》文章介绍Nginx在分布式部署中的反向代理和负载均衡作用,用于分发请求、减轻服务器压力及解决session共享问题,涵盖配置方法、策略及Java项目应用,并提及分布式事... 目录分布式部署NginxJava中的代理代理分为正向代理和反向代理正向代理反向代理Nginx应用场景
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Nginx搭建前端本地预览环境的完整步骤教学

Nginx搭建前端本地预览环境的完整步骤教学

《Nginx搭建前端本地预览环境的完整步骤教学》这篇文章主要为大家详细介绍了Nginx搭建前端本地预览环境的完整步骤教学,文中的示例代码讲解详细,感兴趣的小伙伴可以跟随小编一起学习一下... 目录项目目录结构核心配置文件：nginx.conf脚本化操作：nginx.shnpm 脚本集成总结：对前端的意义很多
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Redis中的有序集合zset从使用到原理分析

Redis中的有序集合zset从使用到原理分析

《Redis中的有序集合zset从使用到原理分析》Redis有序集合(zset)是字符串与分值的有序映射,通过跳跃表和哈希表结合实现高效有序性管理,适用于排行榜、延迟队列等场景,其时间复杂度低,内存占... 目录开篇：排行榜背后的秘密一、zset的基本使用1.1 常用命令1.2 Java客户端示例二、zse
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Redis中的AOF原理及分析

Redis中的AOF原理及分析

《Redis中的AOF原理及分析》Redis的AOF通过记录所有写操作命令实现持久化,支持always/everysec/no三种同步策略,重写机制优化文件体积,与RDB结合可平衡数据安全与恢复效率... 目录开篇：从日记本到AOF一、AOF的基本执行流程1. 命令执行与记录2. AOF重写机制二、AOF的
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MyBatis Plus大数据量查询慢原因分析及解决

MyBatis Plus大数据量查询慢原因分析及解决

《MyBatisPlus大数据量查询慢原因分析及解决》大数据量查询慢常因全表扫描、分页不当、索引缺失、内存占用高及ORM开销,优化措施包括分页查询、流式读取、SQL优化、批处理、多数据源、结果集二次... 目录大数据量查询慢的常见原因优化方案高级方案配置调优监控与诊断总结大数据量查询慢的常见原因MyBAT
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分析 Java Stream 的 peek使用实践与副作用处理方案

分析 Java Stream 的 peek使用实践与副作用处理方案

《分析JavaStream的peek使用实践与副作用处理方案》StreamAPI的peek操作是中间操作,用于观察元素但不终止流,其副作用风险包括线程安全、顺序混乱及性能问题,合理使用场景有限... 目录一、peek 操作的本质：有状态的中间操作二、副作用的定义与风险场景1. 并行流下的线程安全问题2. 顺
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MyBatis/MyBatis-Plus同事务循环调用存储过程获取主键重复问题分析及解决

MyBatis/MyBatis-Plus同事务循环调用存储过程获取主键重复问题分析及解决

《MyBatis/MyBatis-Plus同事务循环调用存储过程获取主键重复问题分析及解决》MyBatis默认开启一级缓存,同一事务中循环调用查询方法时会重复使用缓存数据,导致获取的序列主键值均为1,... 目录问题原因解决办法如果是存储过程总结问题myBATis有如下代码获取序列作为主键IdMappe
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Java 日志中 Marker 的使用示例详解

Java 日志中 Marker 的使用示例详解

《Java日志中Marker的使用示例详解》Marker是SLF4J（以及Logback、Log4j2）提供的一个接口,它本质上是一个命名对象,你可以把它想象成一个可以附加到日志语句上的标签或戳... 目录什么是Marker？为什么使用Markejavascriptr？1. 精细化的过滤2. 触发特定操作3
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linux查找java项目日志查找报错信息方式

linux查找java项目日志查找报错信息方式

《linux查找java项目日志查找报错信息方式》日志查找定位步骤：进入项目,用tail-f实时跟踪日志,tail-n1000查看末尾1000行,grep搜索关键词或时间,vim内精准查找并高亮定位,... 目录日志查找定位在当前文件里找到报错消息总结日志查找定位1.cd 进入项目2.正常日志 和错误日
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