Details
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Task
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Status: Open (View Workflow)
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Major
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Resolution: Unresolved
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1.2.2
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None
Description
In a multi-UM configuration, processes such as DDLProc and DMLProc can sometimes show up in the COLD_STANDBY or the HOT_STANDBY state.
For example:
> getSystemInfo
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getsysteminfo Mon Mar 4 14:24:58 2019
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System cstore-3
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System and Module statuses
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Component Status Last Status Change
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------------ -------------------------- ------------------------
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System ACTIVE Fri Mar 1 20:19:14 2019
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Module um1 ACTIVE Fri Mar 1 20:19:12 2019
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Module um2 ACTIVE Fri Mar 1 20:19:16 2019
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Module pm1 ACTIVE Fri Mar 1 20:15:31 2019
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Module pm2 ACTIVE Fri Mar 1 20:19:15 2019
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Active Parent OAM Performance Module is 'pm1'
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Primary Front-End MariaDB ColumnStore Module is 'um1'
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MariaDB ColumnStore Replication Feature is enabled
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MariaDB ColumnStore set for Distributed Install
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MariaDB ColumnStore Process statuses
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Process Module Status Last Status Change Process ID
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------------------ ------ --------------- ------------------------ ----------
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ProcessMonitor um1 ACTIVE Fri Mar 1 20:14:57 2019 3838
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ServerMonitor um1 ACTIVE Fri Mar 1 20:15:29 2019 6033
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DBRMWorkerNode um1 ACTIVE Fri Mar 1 20:18:24 2019 12918
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ExeMgr um1 ACTIVE Fri Mar 1 20:18:54 2019 13155
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DDLProc um1 ACTIVE Fri Mar 1 20:19:02 2019 13210
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DMLProc um1 ACTIVE Fri Mar 1 20:19:07 2019 13268
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mysqld um1 ACTIVE Fri Mar 1 20:19:12 2019 13761
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ProcessMonitor um2 ACTIVE Fri Mar 1 20:14:56 2019 3855
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ServerMonitor um2 ACTIVE Fri Mar 1 20:15:35 2019 5437
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DBRMWorkerNode um2 ACTIVE Fri Mar 1 20:18:29 2019 10065
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ExeMgr um2 ACTIVE Fri Mar 1 20:18:58 2019 10302
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DDLProc um2 COLD_STANDBY Fri Mar 1 20:19:04 2019
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DMLProc um2 COLD_STANDBY Fri Mar 1 20:19:06 2019
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mysqld um2 ACTIVE Fri Mar 1 20:19:16 2019 10840
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ProcessMonitor pm1 ACTIVE Fri Mar 1 20:14:39 2019 3835
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ProcessManager pm1 ACTIVE Fri Mar 1 20:14:45 2019 13482
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DBRMControllerNode pm1 ACTIVE Fri Mar 1 20:18:22 2019 18294
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ServerMonitor pm1 ACTIVE Fri Mar 1 20:15:28 2019 14632
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DBRMWorkerNode pm1 ACTIVE Fri Mar 1 20:18:33 2019 18406
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PrimProc pm1 ACTIVE Fri Mar 1 20:18:41 2019 18508
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WriteEngineServer pm1 ACTIVE Fri Mar 1 20:18:48 2019 18589
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ProcessMonitor pm2 ACTIVE Fri Mar 1 20:15:13 2019 3838
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ProcessManager pm2 HOT_STANDBY Fri Mar 1 20:15:14 2019 5424
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DBRMControllerNode pm2 COLD_STANDBY Fri Mar 1 20:19:15 2019
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ServerMonitor pm2 ACTIVE Fri Mar 1 20:15:39 2019 5579
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DBRMWorkerNode pm2 ACTIVE Fri Mar 1 20:18:37 2019 6065
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PrimProc pm2 ACTIVE Fri Mar 1 20:18:42 2019 6086
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WriteEngineServer pm2 ACTIVE Fri Mar 1 20:18:49 2019 6131
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Active Alarm Counts: Critical = 0, Major = 0, Minor = 0, Warning = 0, Info = 0
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It does not seem to be documented anywhere how processes may end up in this state. For example, it is not mentioned on the following pages:
https://mariadb.com/kb/en/library/columnstore-multiple-user-module-guide/
https://mariadb.com/kb/en/library/managing-columnstore-module-configurations/
And the COLD_STANDBY state doesn't even seem to be mentioned here:
https://mariadb.com/kb/en/library/columnstore-system-operations/#viewing-process-status