YARN-1050. Document the Fair Scheduler REST API. (Kenji Kikushima and Roman Shaposhnik via kasha)
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Karthik Kambatla
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@ -209,6 +209,8 @@ Release 2.8.0 - UNRELEASED
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YARN-2331. Distinguish shutdown during supervision vs. shutdown for
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rolling upgrade. (Jason Lowe via xgong)
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YARN-1050. Document the Fair Scheduler REST API. (Kenji Kikushima and Roman Shaposhnik via kasha)
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OPTIMIZATIONS
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YARN-3339. TestDockerContainerExecutor should pull a single image and not
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@ -278,7 +278,7 @@ Response Body:
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Cluster Scheduler API
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---------------------
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A scheduler resource contains information about the current scheduler configured in a cluster. It currently supports both the Fifo and Capacity Scheduler. You will get different information depending on which scheduler is configured so be sure to look at the type information.
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A scheduler resource contains information about the current scheduler configured in a cluster. It currently supports the Fifo, Capacity and Fair Scheduler. You will get different information depending on which scheduler is configured so be sure to look at the type information.
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### URI
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@ -984,6 +984,310 @@ Response Body:
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</scheduler>
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```
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### Fair Scheduler API
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### Elements of the *schedulerInfo* object
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| Item | Data Type | Description |
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|:---- |:---- |:---- |
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| type | string | Scheduler type - fairScheduler |
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| rootQueue | The root queue object | A collection of root queue resources |
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### Elements of the root queue object
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| Item | Data Type | Description |
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|:---- |:---- |:---- |
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| maxApps | int | The maximum number of applications the queue can have |
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| minResources | A single resource object | The configured minimum resources that are guaranteed to the queue |
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| maxResources | A single resource object | The configured maximum resources that are allowed to the queue |
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| usedResources | A single resource object | The sum of resources allocated to containers within the queue |
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| fairResources | A single resource object | The queue's fair share of resources |
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| clusterResources | A single resource object | The capacity of the cluster |
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| queueName | string | The name of the queue |
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| schedulingPolicy | string | The name of the scheduling policy used by the queue |
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| childQueues | array of queues(JSON)/queue objects(XML) | A collection of sub-queue information |
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### Elements of the queues object for a Leaf queue - contains all elements in parent plus the following
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| Item | Data Type | Description |
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|:---- |:---- |:---- |
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| type | string | type of the queue - fairSchedulerLeafQueueInfo |
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| numActiveApps | int | The number of active applications in this queue |
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| numPendingApps | int | The number of pending applications in this queue |
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### Elements of the resource object for resourcesUsed in queues
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| Item | Data Type | Description |
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|:---- |:---- |:---- |
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| memory | int | The amount of memory used (in MB) |
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| vCores | int | The number of virtual cores |
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#### Response Examples
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**JSON response**
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HTTP Request:
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GET http://<rm http address:port>/ws/v1/cluster/scheduler
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Response Header:
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HTTP/1.1 200 OK
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Content-Type: application/json
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Transfer-Encoding: chunked
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Server: Jetty(6.1.26)
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Response Body:
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```json
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{
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"scheduler": {
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"schedulerInfo": {
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"rootQueue": {
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"childQueues": [
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{
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"clusterResources": {
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"memory": 8192,
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"vCores": 8
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},
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"fairResources": {
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"memory": 0,
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"vCores": 0
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},
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"maxApps": 2147483647,
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"maxResources": {
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"memory": 8192,
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"vCores": 8
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},
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"minResources": {
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"memory": 0,
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"vCores": 0
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},
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"numActiveApps": 0,
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"numPendingApps": 0,
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"queueName": "root.default",
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"schedulingPolicy": "fair",
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"type": "fairSchedulerLeafQueueInfo",
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"usedResources": {
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"memory": 0,
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"vCores": 0
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}
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},
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{
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"childQueues": {
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"clusterResources": {
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"memory": 8192,
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"vCores": 8
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},
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"fairResources": {
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"memory": 10000,
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"vCores": 0
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},
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"maxApps": 2147483647,
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"maxResources": {
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"memory": 8192,
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"vCores": 8
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},
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"minResources": {
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"memory": 5000,
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"vCores": 0
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},
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"numActiveApps": 0,
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"numPendingApps": 0,
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"queueName": "root.sample_queue.sample_sub_queue",
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"schedulingPolicy": "fair",
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"type": [
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"fairSchedulerLeafQueueInfo"
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],
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"usedResources": {
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"memory": 0,
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"vCores": 0
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}
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},
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"clusterResources": {
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"memory": 8192,
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"vCores": 8
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},
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"fairResources": {
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"memory": 10000,
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"vCores": 0
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},
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"maxApps": 50,
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"maxResources": {
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"memory": 8192,
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"vCores": 0
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},
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"minResources": {
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"memory": 10000,
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"vCores": 0
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},
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"queueName": "root.sample_queue",
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"schedulingPolicy": "fair",
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"usedResources": {
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"memory": 0,
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"vCores": 0
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}
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}
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],
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"clusterResources": {
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"memory": 8192,
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"vCores": 8
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},
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"fairResources": {
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"memory": 8192,
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"vCores": 8
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},
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"maxApps": 2147483647,
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"maxResources": {
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"memory": 8192,
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"vCores": 8
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},
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"minResources": {
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"memory": 0,
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"vCores": 0
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},
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"queueName": "root",
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"schedulingPolicy": "fair",
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"usedResources": {
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"memory": 0,
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"vCores": 0
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}
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},
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"type": "fairScheduler"
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}
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}
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}
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```
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**XML response**
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HTTP Request:
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GET http://<rm http address:port>/ws/v1/cluster/scheduler
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Accept: application/xml
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Response Header:
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HTTP/1.1 200 OK
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Content-Type: application/xml
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Content-Length: 2321
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Server: Jetty(6.1.26)
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Response Body:
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```xml
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<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
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<scheduler>
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<schedulerInfo xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="fairScheduler">
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<rootQueue>
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<maxApps>2147483647</maxApps>
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<minResources>
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<memory>0</memory>
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<vCores>0</vCores>
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</minResources>
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<maxResources>
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<memory>8192</memory>
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<vCores>8</vCores>
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</maxResources>
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<usedResources>
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<memory>0</memory>
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<vCores>0</vCores>
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</usedResources>
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<fairResources>
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<memory>8192</memory>
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<vCores>8</vCores>
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</fairResources>
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<clusterResources>
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<memory>8192</memory>
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<vCores>8</vCores>
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</clusterResources>
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<queueName>root</queueName>
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<schedulingPolicy>fair</schedulingPolicy>
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<childQueues xsi:type="fairSchedulerLeafQueueInfo">
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<maxApps>2147483647</maxApps>
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<minResources>
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<memory>0</memory>
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<vCores>0</vCores>
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</minResources>
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<maxResources>
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<memory>8192</memory>
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<vCores>8</vCores>
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</maxResources>
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<usedResources>
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<memory>0</memory>
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<vCores>0</vCores>
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</usedResources>
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<fairResources>
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<memory>0</memory>
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<vCores>0</vCores>
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</fairResources>
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<clusterResources>
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<memory>8192</memory>
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<vCores>8</vCores>
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</clusterResources>
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<queueName>root.default</queueName>
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<schedulingPolicy>fair</schedulingPolicy>
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<numPendingApps>0</numPendingApps>
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<numActiveApps>0</numActiveApps>
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</childQueues>
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<childQueues>
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<maxApps>50</maxApps>
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<minResources>
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<memory>10000</memory>
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<vCores>0</vCores>
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</minResources>
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<maxResources>
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<memory>8192</memory>
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<vCores>0</vCores>
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</maxResources>
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<usedResources>
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<memory>0</memory>
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<vCores>0</vCores>
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</usedResources>
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<fairResources>
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<memory>10000</memory>
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<vCores>0</vCores>
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</fairResources>
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<clusterResources>
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<memory>8192</memory>
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<vCores>8</vCores>
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</clusterResources>
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<queueName>root.sample_queue</queueName>
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<schedulingPolicy>fair</schedulingPolicy>
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<childQueues xsi:type="fairSchedulerLeafQueueInfo">
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<maxApps>2147483647</maxApps>
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<minResources>
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<memory>5000</memory>
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<vCores>0</vCores>
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</minResources>
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<maxResources>
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<memory>8192</memory>
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<vCores>8</vCores>
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</maxResources>
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<usedResources>
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<memory>0</memory>
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<vCores>0</vCores>
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</usedResources>
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<fairResources>
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<memory>10000</memory>
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<vCores>0</vCores>
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</fairResources>
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<clusterResources>
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<memory>8192</memory>
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<vCores>8</vCores>
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</clusterResources>
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<queueName>root.sample_queue.sample_sub_queue</queueName>
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<schedulingPolicy>fair</schedulingPolicy>
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<numPendingApps>0</numPendingApps>
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<numActiveApps>0</numActiveApps>
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</childQueues>
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</childQueues>
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</rootQueue>
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</schedulerInfo>
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</scheduler>
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```
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Cluster Applications API
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------------------------
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