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--- onboarding:snmpmanager:quartz_-_scheduling_overview [2017/02/14 00:44] – created dmcgee
+++ onboarding:snmpmanager:quartz_-_scheduling_overview [2021/06/25 10:09] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+====== Quartz - Scheduling Overview ======
+Author: David McGee
+**Introduction**
+Quartz is [1] an open source job scheduling library that can be integrated within a Java application. It can be used to create simple or complex schedules for executing tens, hundreds, or even tens-of-thousands of jobs; jobs whose tasks are defined as standard Java components that may execute virtually anything you may program them to do. Quartz is freely usable, licensed under the Apache 2.0 license.
+Errigal utilise Quartz for scheduling of jobs across the IDMS platform. This may be open to future improvements!
+**Configuration**
+Using the **thread_config** table of the **SnmpManager** database, one can specify on which servers running the Quartz a specific job type should run (e.g. apps1 only runs CONFIG_SYNC and apps2 only runs SYNC_SCHEDULER).
+**thread_config** example ("select * from thread_config"):
+| **id** | **failover_hostname** | **hostname** | **is_active** | **type**                  | **params** | **application_port** |
+| 44 | lb1               | lb1      |           | DISTRIBUTOR           | NULL   |             8442 |
+| 45 | apps1             | apps1    |           | HANDLER               | NULL   |             8442 |
+| 46 | apps2             | apps2    |           | HANDLER               | NULL   |             8442 |
+| 49 | apps1             | apps1    |           | CONFIG_SYNC           | NULL   |             8442 |
+| 55 | apps2             | apps2    |           | SYNC_SCHEDULER        | NULL   |             8442 |
+**Grails Plugin**
+The grails quartz plugin [2] adds Quartz job scheduling features to the Grails framework by wrapping the quartz scheduling library in a plugin. This is possible through specifying the appropriate version of the Quartz plugin via an IDMS application's BuildConfig.groovy (Example: compile ':quartz:1.0.1'). Use of the Grails Quartz plugin at Errigal has been a mixed bag. It has both helped and hindered development at times. Some issues have occurred around clustering.
+**Scheduling a Job**
+Please find an example from the [3] official plugin documentation:
+{{:onboarding:snmpmanager:quartz_-_job_schedule.png|}}
+**Scheduling a Cron Job**
+Please find an example from the [3] official plugin documentation:
+{{:onboarding:snmpmanager:quartz_-_cron_schedule.png|}}
+**Errigal Support - Quartz Issues observed**
+  * Fully Blocked jobs - One of the most common issues observed in production involves Quartz jobs becoming blocked/hung. Errigal Watchdog monitors for occurrences of this and triggers QuartzJobBlocked alarms for these event types. A quick search in the Errigal Support Evernote repository will give you some tips on how to resolve this. Please consult with a colleague before trying this.
+**Self-assessment**
+  - Find out how to unblock a blocked quartz job, for your own knowledge. This shouldn't be run on a QA or production system.
+  - Identify the current Grails quartz plugin being used across the IDMS applications. BitBucket is your friend, here!
+  - Find 1 quartz job in each of the IDMS applications: SNMP Manager, Ticketer, Reporting Manager and NOC Portal. Take a look at how the jobs are written.
+**Resources**
+[1] [[http://www.quartz-scheduler.org/|Quartz Scheduler - Official Website]]
+[2] [[https://grails.org/plugin/quartz|Grails - Quartz Plugin]]
+[3] [[http://grails-plugins.github.io/grails-quartz/|Grails - Plugin Documentation]]

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