From 3024a4702676632f3de71196fe5c2714eae1905f Mon Sep 17 00:00:00 2001
From: zhuqi <821684824@qq.com>
Date: Wed, 8 Sep 2021 22:03:15 +0800
Subject: [PATCH] Add documentation for YARN-10623 auto refresh queue conf in
 CS (#3279)

---
 .../src/site/markdown/CapacityScheduler.md                | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/CapacityScheduler.md b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/CapacityScheduler.md
index 254c51abd0..d35869c759 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/CapacityScheduler.md
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/CapacityScheduler.md
@@ -831,6 +831,14 @@ Changing queue/scheduler properties and adding/removing queues can be done in tw
 
   Remove the queue configurations from the file and run refresh as described above
 
+### Enabling periodic configuration refresh
+Enabling queue configuration periodic refresh allows reloading and applying the configuration by editing the *conf/capacity-scheduler.xml* without the necessicity of calling yarn rmadmin -refreshQueues.
+
+| Property | Description |
+|:---- |:---- |
+| `yarn.resourcemanager.scheduler.monitor.enable` | Enabling monitoring is necessary for the periodic refresh. Default value is false. |
+| `yarn.resourcemanager.scheduler.monitor.policies` | This is a configuration property that holds a list of classes. Adding more classes means more monitor tasks will be launched, Add `org.apache.hadoop.yarn.server.resourcemanager.capacity.QueueConfigurationAutoRefreshPolicy` to the policies list to enable the periodic refresh. Default value of this property is `org.apache.hadoop.yarn.server.resourcemanager.monitor.capacity.ProportionalCapacityPreemptionPolicy`, it means the preemption feature is enabled by default. If the ProportionalCapacityPreemptionPolicy class is removed from the list, it disables the preemption feature. |
+| `yarn.resourcemanager.queue.auto.refresh.monitoring-interval` | Adjusting the auto-refresh monitoring interval is possible with this configuration property. The value is in milliseconds. The default value is 5000 (5 seconds). |
 ### Changing queue configuration via API
 
   Editing by API uses a backing store for the scheduler configuration. To enable this, the following parameters can be configured in yarn-site.xml.