added tools

Author: wwwted

tools/event_job.sh

@@ -0,0 +1,67 @@
+#!/bin/bash
+#
+# Handles simple use case of enable/disable events and event handler when using
+# InnoDB Cluster. Only enable events on PRIMARY node.
+#
+# Works like:
+#  if (primary)
+#      if (event scheduler is disabled) -- means, we have had a failover/switchover
+#          enable all events ()
+#          enable event scheduler ()
+#  else  -- secondary
+#      if (event scheduler enabled)
+#          disable event scheduler ()
+#
+# Run via crontab on MySQL nodes
+#
+# USE AT OWN RISK!!
+#
+# TODO:
+# - Login using login-path to avoid warnings: https://dev.mysql.com/doc/refman/8.0/en/mysql-config-editor.html
+# - Add lock via table/row in DB to avoid multiple instances running at the same time
+#   Not sure how important this is, should be safe as it is ....
+# - Remove use of temporary file /tmp/events.tmp
+#
+
+MyHosts=("127.0.0.1:3310" "127.0.0.1:3320" "127.0.0.1:3330")
+dbUser="root"
+dbPwd="root"
+debug=0
+
+for val in ${MyHosts[*]}; do
+     host=`echo $val|cut -d: -f1`
+     port=`echo $val|cut -d: -f2`
+     if [ $debug -gt 0 ]; then echo "Server: $host $port"; fi
+     server_uuid=`mysql -u$dbUser -p$dbPwd -h$host -P$port -se"SELECT @@server_UUID"`
+     primary_uuid=`mysql -u$dbUser -p$dbPwd -h$host -P$port -se"SELECT MEMBER_ID FROM performance_schema.replication_group_members WHERE MEMBER_ROLE='PRIMARY'"`
+     event_scheduler_status=`mysql -u$dbUser -p$dbPwd -h$host -P$port -se"SELECT VARIABLE_VALUE FROM performance_schema.global_variables WHERE VARIABLE_NAME='event_scheduler'"`
+
+     if [ -z "$server_uuid" ]
+     then
+        echo "Did not find any server_uuid for ($host,$port), exiting..."
+        exit 1
+     fi
+     if [ $debug -gt 0 ]; then echo $server_uuid $primary_uuid $event_scheduler_status; fi
+
+     if [ "$server_uuid" = "$primary_uuid" ]
+     then
+        if [ $debug -gt 0 ]; then echo "Primary"; fi
+        if [ "$event_scheduler_status" = "OFF" ]
+        then
+           echo "PRIMARY($host:$port): Enable all the events and start event scheduler"
+           mysql mysql -u$dbUser -p$dbPwd -h$host -P$port -se"SELECT CONCAT('ALTER EVENT ',EVENT_SCHEMA,'.',EVENT_NAME,' ENABLE;') FROM INFORMATION_SCHEMA.EVENTS WHERE STATUS != 'ENABLED'" > /tmp/events.tmp
+           mysql mysql -u$dbUser -p$dbPwd -h$host -P$port < /tmp/events.tmp
+           mysql mysql -u$dbUser -p$dbPwd -h$host -P$port -se"SET GLOBAL event_scheduler = ON"
+           mysql mysql -u$dbUser -p$dbPwd -h$host -P$port -se"SET PERSIST event_scheduler = ON"
+        fi
+     else # slave/secondary
+        if [ $debug -gt 0 ]; then echo "Secondary"; fi
+        if [ "$event_scheduler_status" = "ON" ]
+        then
+           echo "SECONDARY($host:$port): Disable the event scheduler"
+           mysql mysql -u$dbUser -p$dbPwd -h$host -P$port -se"SET GLOBAL event_scheduler = OFF"
+           mysql mysql -u$dbUser -p$dbPwd -h$host -P$port -se"SET PERSIST event_scheduler = OFF"
+        fi
+     fi
+done
+