add tikvGCLifeTime option

charts/tidb-backup/templates/scripts/_start_backup.sh.tpl

@@ -15,8 +15,8 @@ fi
 gc_life_time=`/usr/bin/mysql -h${host} -P4000 -u${TIDB_USER} ${password_str} -Nse "select variable_value from mysql.tidb where variable_name='tikv_gc_life_time';"`
 echo "Old TiKV GC life time is ${gc_life_time}"
 
-echo "Increase TiKV GC life time to 3h"
-/usr/bin/mysql -h${host} -P4000 -u${TIDB_USER} ${password_str} -Nse "update mysql.tidb set variable_value='3h' where variable_name='tikv_gc_life_time';"
+echo "Increase TiKV GC life time to {{ .Values.tikvGCLifeTime | default 720h }}"
+/usr/bin/mysql -h${host} -P4000 -u${TIDB_USER} ${password_str} -Nse "update mysql.tidb set variable_value='{{ .Values.tikvGCLifeTime | default 720h }}' where variable_name='tikv_gc_life_time';"
 /usr/bin/mysql -h${host} -P4000 -u${TIDB_USER} ${password_str} -Nse "select variable_name,variable_value from mysql.tidb where variable_name='tikv_gc_life_time';"
 
 if [ -n "{{ .Values.initialCommitTs }}" ];

charts/tidb-backup/values.yaml

@@ -59,6 +59,9 @@ backupOptions: "-t 16 -F 256 --skip-tz-utc --verbose=3"
 initialCommitTs: ""
 # restoreOptions is the options of loader https://www.pingcap.com/docs-cn/tools/loader/
 restoreOptions: "-t 16"
+# The time limit during which data is retained for each GC when backup, in the format of Go Duration.
+# When a GC happens, the current time minus this value is the safe point.
+tikvGCLifeTime: 720h
 
 # By default, the backup/restore uses PV to store/load backup data
 # You can choose to store/load backup data to/from gcp, ceph or s3 bucket by enabling the following corresponding section:

charts/tidb-cluster/templates/scripts/_start_scheduled_backup.sh.tpl

@@ -19,8 +19,8 @@ fi
 gc_life_time=`/usr/bin/mysql -h${host} -P4000 -u${TIDB_USER} ${password_str} -Nse "select variable_value from mysql.tidb where variable_name='tikv_gc_life_time';"`
 echo "Old TiKV GC life time is ${gc_life_time}"
 
-echo "Increase TiKV GC life time to 3h"
-/usr/bin/mysql -h${host} -P4000 -u${TIDB_USER} ${password_str} -Nse "update mysql.tidb set variable_value='3h' where variable_name='tikv_gc_life_time';"
+echo "Increase TiKV GC life time to {{ .Values.scheduledBackup.tikvGCLifeTime | default 720h }}"
+/usr/bin/mysql -h${host} -P4000 -u${TIDB_USER} ${password_str} -Nse "update mysql.tidb set variable_value='{{ .Values.scheduledBackup.tikvGCLifeTime | default 720h }}' where variable_name='tikv_gc_life_time';"
 /usr/bin/mysql -h${host} -P4000 -u${TIDB_USER} ${password_str} -Nse "select variable_name,variable_value from mysql.tidb where variable_name='tikv_gc_life_time';"
 
 /mydumper \

charts/tidb-cluster/values.yaml

@@ -524,6 +524,9 @@ scheduledBackup:
   # Other useful options are -B for database, and -T for tables.
   # See https://github.com/maxbube/mydumper/blob/master/docs/mydumper_usage.rst#options for more options.
   options: "-t 16 -F 256 --skip-tz-utc --verbose=3"
+  # The time limit during which data is retained for each GC when backup, in the format of Go Duration.
+  # When a GC happens, the current time minus this value is the safe point.
+  tikvGCLifeTime: 720h
   # secretName is the name of the secret which stores user and password used for backup
   # Note: you must give the user enough privilege to do the backup
   # you can create the secret by: