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- The Cluster Service is used to operate a passive cluster of JOC Cockpit instances and to perform fail-over operations and switch-over operations between cluster members.
- Any All other JS7 - Services depend on the Cluster Service in order to be started for the active JOC Cockpit instance.
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The switch-over operation is technically similar to the fail-over operation, however, switch-over is caused by the GUI or by the API and allows the Cluster Service to normally stop any running background services that are running.
Configuration
Location
- The "Settings" menu is available from in the JOC Cockpit GUI.
Configuration Items
| Section | Setting | Default | Required | Purpose |
|---|---|---|---|---|
| cluster | heart_beat_exceeded_interval | 60 | no | The duration in seconds to signal that heartbeats from an active cluster member to the database did not arrive in time and that fail-over to the next passive cluster member should occur. |
polling_interval | 30 | no | The interval in seconds for between sending heartbeats to the database. | |
polling_wait_interval_on_error | 2 | no | The interval in seconds to continue polling after an error has occurred, e.g. due to transactional concurrency etc. | |
switch_member_wait_counter_on_success | 10 | no | The number of retries to wait for the answer from the last active cluster member after its deactivation/activation. | |
switch_member_wait_interval_on_success | 5 | no | The maximum number of seconds to wait for a cluster member to become active. max wait time = switch_member_wait_counter_on_success * switch_member_wait_interval_on_success + execution time | |
switch_member_wait_counter_on_error | 10 | no | The maximum number of retries in case of errors, e.g. due to transactional concurrency etc., to switch the cluster to a different member. | |
switch_member_wait_interval_on_error | 2 | no | The maximum number of seconds to wait for a cluster member to become active after an error. max wait time = switch_member_wait_counter_on_error*switchMemberWaitIntervalOnError+ execution time | |
current_is_cluster_member | true | no | Enable cluster to switch to this instance. |
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- The Cluster Service logs general messages, warnings and errors to the
joc.logfile. - More detailed information in addition is logged to the Main Log
service-cluster.logfile. - In addition to the Main Log, detailed debug information is logged to the Debug Log
service-cluster-debug.logfile. - For details see JS7 - Log Files and Locations
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