Node and cluster default job schedulers
Pega Platform includes job scheduler instances that persist system state and that clean obsolete data for a node and for a cluster.
By default, the node cleaner job scheduler (pyNodeCleaner) runs the Code-.pzNodeCleaner activity on all the nodes in the cluster. It cleans up expired locks and outdated module version reports.
Cluster and database cleaner
By default, the cluster and database job scheduler (pyClusterAndDBCleaner) runs the Code-.pzClusterAndDBCleaner activity on only one node in the cluster, once every 24 hours for housekeeping tasks. This job purges the following items:
- Older records (instances) from log tables
- Any requestors that have had no activity during at least 48 hours
- Passivation data for expired requestors
- Rows from the
pc_eventsdatabase table according to the EventsRetentionPeriod dynamic system setting (the default retention period is 90 days)
- Any nodes that have not responded to the pulse for 30 days
- Expired locks
- Old usage data if usage tracking is enabled
- Cluster state data that is older than 90 days
Once per day, this activity calls Log-Usage.UsageCleaner, which
trims older rows of the
pr_perf_stats table (corresponding to the
Log-Usage class). This activity starts a stored procedure,
passing a number of days to retain based on the value of the
pxProcess.pxLogUsage RetentionPeriod property. The default is
30 days, which can be updated through an entry in the
prconfig.xml file or in a dynamic system setting.
You can change the idle requestor purge criterion to a value that is less than 48
hours by overriding the setting
is in seconds.
You can optionally create an activity that is similar to Code-.pzClusterAndDBCleaner and associate it with another job scheduler to purge other outdated information and to recover tablespace. Ensure that the job scheduler has access to the needed ruleset versions and does not purge instances that are referenced in other tables.
Persist node and cluster state
Node state is saved by pyPersistNodeState on node start up. Cluster state is saved once a day by the pyPersistClusterState job scheduler. Cluster state data is saved for 90 days and is purged by the pzClusterAndDBCleaner job scheduler.
ArticleJob scheduler rules