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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《Java使用SLF4J记录不同级别日志的示例详解》SLF4J是一个简单的日志门面,它允许在运行时选择不同的日志实现,这篇文章主要为大家详细介绍了如何使用SLF4J记录不同级别日志,感兴趣的可以了解下... 目录一、SLF4J简介二、添加依赖三、配置Logback四、记录不同级别的日志五、总结一、SLF4J
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Java字符串操作技巧之语法、示例与应用场景分析

Java字符串操作技巧之语法、示例与应用场景分析

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python logging模块详解及其日志定时清理方式

python logging模块详解及其日志定时清理方式

《pythonlogging模块详解及其日志定时清理方式》：本文主要介绍pythonlogging模块详解及其日志定时清理方式,具有很好的参考价值,希望对大家有所帮助,如有错误或未考虑完全的地... 目录python logging模块及日志定时清理1.创建logger对象2.logging.basicCo
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Python如何自动生成环境依赖包requirements

Python如何自动生成环境依赖包requirements

《Python如何自动生成环境依赖包requirements》：本文主要介绍Python如何自动生成环境依赖包requirements问题,具有很好的参考价值,希望对大家有所帮助,如有错误或未考虑... 目录生成当前 python 环境 安装的所有依赖包1、命令2、常见问题只生成当前 项目 的所有依赖包1、
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Qt spdlog日志模块的使用详解

Qt spdlog日志模块的使用详解

《Qtspdlog日志模块的使用详解》在Qt应用程序开发中,良好的日志系统至关重要,本文将介绍如何使用spdlog1.5.0创建满足以下要求的日志系统,感兴趣的朋友一起看看吧... 目录版本摘要例子logmanager.cpp文件main.cpp文件版本spdlog版本：1.5.0采用1.5.0版本主要
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Python 迭代器和生成器概念及场景分析

Python 迭代器和生成器概念及场景分析

《Python迭代器和生成器概念及场景分析》yield是Python中实现惰性计算和协程的核心工具,结合send()、throw()、close()等方法,能够构建高效、灵活的数据流和控制流模型,这... 目录迭代器的介绍自定义迭代器省略的迭代器生产器的介绍yield的普通用法yield的高级用法yidle
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Redis在windows环境下如何启动

Redis在windows环境下如何启动

《Redis在windows环境下如何启动》：本文主要介绍Redis在windows环境下如何启动的实现方式,具有很好的参考价值,希望对大家有所帮助,如有错误或未考虑完全的地方,望不吝赐教... 目录Redis在Windows环境下启动1.在redis的安装目录下2.输入·redis-server.exe
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Pytest多环境切换的常见方法介绍

Pytest多环境切换的常见方法介绍

《Pytest多环境切换的常见方法介绍》Pytest作为自动化测试的主力框架,如何实现本地、测试、预发、生产环境的灵活切换,本文总结了通过pytest框架实现自由环境切换的几种方法,大家可以根据需要进... 目录1.pytest-base-url2.hooks函数3.yml和fixture结论你是否也遇到过
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C++ Sort函数使用场景分析

C++ Sort函数使用场景分析

《C++Sort函数使用场景分析》sort函数是algorithm库下的一个函数,sort函数是不稳定的,即大小相同的元素在排序后相对顺序可能发生改变,如果某些场景需要保持相同元素间的相对顺序,可使... 目录C++ Sort函数详解一、sort函数调用的两种方式二、sort函数使用场景三、sort函数排序
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