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Overview

The scheduler REST API returns information about various objects used by the YuniKorn Scheduler.

Many of these APIs return collections of resources. Internally, all resources are represented as raw 64-bit signed integer types. When interpreting responses from the REST API, resources of type memory are returned in units of bytes while resources of type vcore are returned in units of millicores (thousands of a core). All other resource types have no specific unit assigned.

Under the allocations field in the response content for the app/node-related calls in the following spec, placeholderUsed refers to whether or not the allocation is a replacement for a placeholder. If true, requestTime is the creation time of its placeholder allocation, otherwise it's that of the allocation's ask. allocationTime is the creation time of the allocation, and allocationDelay is simply the difference between allocationTime and requestTime.

Partitions

Returns general information and statistics about a partition.

URL : /ws/v1/partitions

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content examples

[
{
"clusterId": "mycluster",
"name": "default",
"state": "Active",
"lastStateTransitionTime": 1649167576110754000,
"capacity": {
"capacity": {
"ephemeral-storage": 188176871424,
"hugepages-1Gi": 0,
"hugepages-2Mi": 0,
"memory": 1000000000,
"pods": 330,
"vcore": 1000
},
"usedCapacity": {
"memory": 800000000,
"vcore": 500
},
"utilization": {
"memory": 80,
"vcore": 50
}
},
"nodeSortingPolicy": {
"type": "fair",
"resourceWeights": {
"memory": 1.5,
"vcore": 1.3
}
},
"applications": {
"New": 5,
"Pending": 5,
"total": 10
},
"totalContainers": 0,
"totalNodes": 2
},
{
"clusterId": "mycluster",
"name": "gpu",
"state": "Active",
"lastStateTransitionTime": 1649167576111236000,
"capacity": {
"capacity": {
"memory": 2000000000,
"vcore": 2000
},
"usedCapacity": {
"memory": 500000000,
"vcore": 300
},
"utilization": {
"memory": 25,
"vcore": 15
}
},
"nodeSortingPolicy": {
"type": "binpacking",
"resourceWeights": {
"memory": 0,
"vcore": 4.11
}
},
"applications": {
"New": 5,
"Running": 10,
"Pending": 5,
"total": 20
},
"totalContainers": 20,
"totalNodes": 5
}
]

Error response

Code : 500 Internal Server Error

Content examples

{
"status_code": 500,
"message": "system error message. for example, json: invalid UTF-8 in string: ..",
"description": "system error message. for example, json: invalid UTF-8 in string: .."
}

PlacementRules

Returns the list of currently active placement rules for the partition. This list can be different from the list in the configuration.

URL : /ws/v1/partition/{partitionName}/placementrules

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content example

[
{
"name": "provided",
"parameters": {
"create":"false"
}
},
{
"name":"recovery",
"parameters": {
"queue": "root.@recovery@"
}
}
]

Error responses

Code : 400 Bad Request (URL query is invalid, missing partition name)

Code : 404 Not Found (Partition not found)

Code : 500 Internal Server Error

Queues

Partition queues

Fetch all Queues associated with given Partition and displays general information about the queues like name, status, capacities and properties. The queues' hierarchy is kept in the response json.

URL : /ws/v1/partition/{partitionName}/queues

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content examples

For the default queue hierarchy (only root.default leaf queue exists) a similar response to the following is sent back to the client:

[
{
"queuename": "root",
"status": "Active",
"maxResource": {
"ephemeral-storage": 188176871424,
"hugepages-1Gi": 0,
"hugepages-2Mi": 0,
"memory": 8000000000,
"pods": 330,
"vcore": 8000
},
"guaranteedResource": {
"memory": 54000000,
"vcore": 80
},
"allocatedResource": {
"memory": 54000000,
"vcore": 80
},
"pendingResource": {
"memory": 54000000,
"vcore": 80
},
"isLeaf": "false",
"isManaged": "false",
"properties": {
"application.sort.policy": "stateaware"
},
"parent": "",
"template": {
"maxResource": {
"memory": 8000000000,
"vcore": 8000
},
"guaranteedResource": {
"memory": 54000000,
"vcore": 80
},
"properties": {
"application.sort.policy": "stateaware"
}
},
"partition": "default",
"children": [
{
"queuename": "root.default",
"status": "Active",
"maxResource": {
"memory": 8000000000,
"vcore": 8000
},
"guaranteedResource": {
"memory": 54000000,
"vcore": 80
},
"allocatedResource": {
"memory": 54000000,
"vcore": 80
},
"pendingResource": {
"memory": 54000000,
"vcore": 80
},
"isLeaf": "true",
"isManaged": "false",
"properties": {
"application.sort.policy": "stateaware"
},
"parent": "root",
"template": null,
"children": [],
"absUsedCapacity": {
"memory": 1,
"vcore": 0
},
"maxRunningApps": 12,
"runningApps": 4,
"allocatingAcceptedApps": [
"app-1",
"app-2"
]
}
],
"absUsedCapacity": {
"memory": 1,
"vcore": 0
}
}
]

Error response

Code : 500 Internal Server Error

Content examples

{
"status_code": 500,
"message": "system error message. for example, json: invalid UTF-8 in string: ..",
"description": "system error message. for example, json: invalid UTF-8 in string: .."
}

Applications

Partition applications

Fetch all Applications for the given Partition/State combination and displays general information about the applications like used resources, queue name, submission time and allocations. Only following application states are allowed: active, rejected, completed. Active is a fake state that represents all application states except completed and rejected. For active state, can narrow the result by status query parameters(case-insensitive). For example, can fetch Running applications for the default partition by /ws/v1/partition/default/applications/active?status=running.

URL : /ws/v1/partition/:partition/applications/:state

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content examples

The content of the application object is the same as Queue Applications. See Queue Applications for details.

Queue applications

Fetch all Applications for the given Partition/Queue combination and displays general information about the applications like used resources, queue name, submission time and allocations.

URL : /ws/v1/partition/{partitionName}/queue/{queueName}/applications

Method : GET

Auth required : NO

Success response

Code : 200 OK

Deprecated:

Field uuid has been deprecated, would be removed from below response in YUNIKORN 1.7.0 release. AllocationID has replaced uuid. Both uuid and AllocationID fields have the same value. AllocationID has extra suffix containing hyphen and counter (-0, -1 and so on) at the end.

Content examples

In the example below there are three allocations belonging to two applications, one with a pending request.

[
{
"applicationID": "application-0001",
"usedResource": {
"memory": 4000000000,
"vcore": 4000
},
"maxUsedResource": {
"memory": 4000000000,
"vcore": 4000
},
"pendingResource": {
"memory": 4000000000,
"vcore": 4000
},
"partition": "default",
"queueName": "root.default",
"submissionTime": 1648754032076020293,
"requests": [
{
"allocationKey": "f137fab6-3cfa-4536-93f7-bfff92689382",
"allocationTags": {
"kubernetes.io/label/app": "sleep",
"kubernetes.io/label/applicationId": "application-0001",
"kubernetes.io/label/queue": "root.default",
"kubernetes.io/meta/namespace": "default",
"kubernetes.io/meta/podName": "task2"
},
"requestTime": 16487540320812345678,
"resource": {
"memory": 4000000000,
"vcore": 4000
},
"pendingCount": 1,
"priority": "0",
"requiredNodeId": "",
"applicationId": "application-0001",
"partition": "default",
"placeholder": false,
"placeholderTimeout": 0,
"taskGroupName": "",
"allocationLog": [
{
"message": "node(s) didn't match Pod's node affinity, node(s) had taint {node-role.kubernetes.io/master: }, that the pod didn't tolerate",
"lastOccurrence": 16487540320812346001,
"count": 81
},
{
"message": "node(s) had taint {node-role.kubernetes.io/master: }, that the pod didn't tolerate, node(s) didn't match Pod's node affinity",
"lastOccurrence": 16487540320812346002,
"count": 504
},
{
"message": "node(s) didn't match Pod's node affinity",
"lastOccurrence": 16487540320812346003,
"count": 1170
}
]
}
],
"allocations": [
{
"allocationKey": "deb12221-6b56-4fe9-87db-ebfadce9aa20",
"allocationTags": {
"kubernetes.io/label/app": "sleep",
"kubernetes.io/label/applicationId": "application-0001",
"kubernetes.io/label/queue": "root.default",
"kubernetes.io/meta/namespace": "default",
"kubernetes.io/meta/podName": "task0"
},
"requestTime": 1648754034098912461,
"allocationTime": 1648754035973982920,
"allocationDelay": 1875070459,
"uuid": "9af35d44-2d6f-40d1-b51d-758859e6b8a8",
"allocationID": "9af35d44-2d6f-40d1-b51d-758859e6b8a8-0",
"resource": {
"memory": 4000000000,
"vcore": 4000
},
"priority": "0",
"nodeId": "node-0001",
"applicationId": "application-0001",
"partition": "default",
"placeholder": false,
"placeholderUsed": true
}
],
"applicationState": "Running",
"user": "system:serviceaccount:kube-system:deployment-controller",
"groups": [
"system:serviceaccounts",
"system:serviceaccounts:kube-system",
"system:authenticated"
],
"rejectedMessage": "",
"stateLog": [
{
"time": 1648741409145224000,
"applicationState": "Accepted"
},
{
"time": 1648741409147432100,
"applicationState": "Running"
}
],
"placeholderData": [
{
"taskGroupName": "task-group-example",
"count": 2,
"minResource": {
"memory": 1000000000,
"vcore": 100
},
"replaced": 1,
"timedout": 1
}
],
"hasReserved": false,
"reservations": []
},
{
"applicationID": "application-0002",
"usedResource": {
"memory": 4000000000,
"vcore": 4000
},
"maxUsedResource": {
"memory": 4000000000,
"vcore": 4000
},
"pendingResource": {
"memory": 4000000000,
"vcore": 4000
},
"partition": "default",
"queueName": "root.default",
"submissionTime": 1648754032076020293,
"requests": [],
"allocations": [
{
"allocationKey": "54e5d77b-f4c3-4607-8038-03c9499dd99d",
"allocationTags": {
"kubernetes.io/label/app": "sleep",
"kubernetes.io/label/applicationId": "application-0002",
"kubernetes.io/label/queue": "root.default",
"kubernetes.io/meta/namespace": "default",
"kubernetes.io/meta/podName": "task0"
},
"requestTime": 1648754034098912461,
"allocationTime": 1648754035973982920,
"allocationDelay": 1875070459,
"uuid": "08033f9a-4699-403c-9204-6333856b41bd",
"allocationID": "08033f9a-4699-403c-9204-6333856b41bd-0",
"resource": {
"memory": 2000000000,
"vcore": 2000
},
"priority": "0",
"nodeId": "node-0001",
"applicationId": "application-0002",
"partition": "default",
"placeholder": false,
"placeholderUsed": false
},
{
"allocationKey": "af3bd2f3-31c5-42dd-8f3f-c2298ebdec81",
"allocationTags": {
"kubernetes.io/label/app": "sleep",
"kubernetes.io/label/applicationId": "application-0002",
"kubernetes.io/label/queue": "root.default",
"kubernetes.io/meta/namespace": "default",
"kubernetes.io/meta/podName": "task1"
},
"requestTime": 1648754034098912461,
"allocationTime": 1648754035973982920,
"allocationDelay": 1875070459,
"uuid": "96beeb45-5ed2-4c19-9a83-2ac807637b3b",
"allocationID": "96beeb45-5ed2-4c19-9a83-2ac807637b3b-0",
"resource": {
"memory": 2000000000,
"vcore": 2000
},
"priority": "0",
"nodeId": "node-0002",
"applicationId": "application-0002",
"partition": "default",
"placeholder": false,
"placeholderUsed": false
}
],
"applicationState": "Running",
"user": "system:serviceaccount:kube-system:deployment-controller",
"groups": [
"system:serviceaccounts",
"system:serviceaccounts:kube-system",
"system:authenticated"
],
"rejectedMessage": "",
"stateLog": [
{
"time": 1648741409145224000,
"applicationState": "Accepted"
},
{
"time": 1648741409147432100,
"applicationState": "Running"
}
],
"placeholderData": [],
"hasReserved": false,
"reservations": []
}
]

Error response

Code : 500 Internal Server Error

Content examples

{
"status_code": 500,
"message": "system error message. for example, json: invalid UTF-8 in string: ..",
"description": "system error message. for example, json: invalid UTF-8 in string: .."
}

Application

Partition/Queue application

Fetch an Application given a Partition, Queue(optional) and Application ID and displays general information about the application like used resources, queue name, submission time and allocations.

URL : /ws/v1/partition/{partitionName}/application/{appId} or /ws/v1/partition/{partitionName}/queue/{queueName}/application/{appId}

Method : GET

Auth required : NO

Success response

Code : 200 OK

Deprecated:

Field uuid has been deprecated, would be removed from below response in YUNIKORN 1.7.0 release. AllocationID has replaced uuid. Both uuid and AllocationID fields have the same value. AllocationID has extra suffix containing hyphen and counter (-0, -1 and so on) at the end.

Content example

{
"applicationID": "application-0001",
"usedResource": {
"memory": 4000000000,
"vcore": 4000
},
"maxUsedResource": {
"memory": 4000000000,
"vcore": 4000
},
"pendingResource": {
"memory": 4000000000,
"vcore": 4000
},
"partition": "default",
"queueName": "root.default",
"submissionTime": 1648754032076020293,
"requests": [
{
"allocationKey": "f137fab6-3cfa-4536-93f7-bfff92689382",
"allocationTags": {
"kubernetes.io/label/app": "sleep",
"kubernetes.io/label/applicationId": "application-0001",
"kubernetes.io/label/queue": "root.default",
"kubernetes.io/meta/namespace": "default",
"kubernetes.io/meta/podName": "task2"
},
"requestTime": 16487540320812345678,
"resource": {
"memory": 4000000000,
"vcore": 4000
},
"pendingCount": 1,
"priority": "0",
"requiredNodeId": "",
"applicationId": "application-0001",
"partition": "default",
"placeholder": false,
"placeholderTimeout": 0,
"taskGroupName": "",
"allocationLog": [
{
"message": "node(s) didn't match Pod's node affinity, node(s) had taint {node-role.kubernetes.io/master: }, that the pod didn't tolerate",
"lastOccurrence": 16487540320812346001,
"count": 81
},
{
"message": "node(s) had taint {node-role.kubernetes.io/master: }, that the pod didn't tolerate, node(s) didn't match Pod's node affinity",
"lastOccurrence": 16487540320812346002,
"count": 504
},
{
"message": "node(s) didn't match Pod's node affinity",
"lastOccurrence": 16487540320812346003,
"count": 1170
}
]
}
],
"allocations": [
{
"allocationKey": "deb12221-6b56-4fe9-87db-ebfadce9aa20",
"allocationTags": {
"kubernetes.io/label/app": "sleep",
"kubernetes.io/label/applicationId": "application-0001",
"kubernetes.io/label/queue": "root.default",
"kubernetes.io/meta/namespace": "default",
"kubernetes.io/meta/podName": "task0"
},
"requestTime": 1648754034098912461,
"allocationTime": 1648754035973982920,
"allocationDelay": 1875070459,
"uuid": "9af35d44-2d6f-40d1-b51d-758859e6b8a8",
"allocationID": "9af35d44-2d6f-40d1-b51d-758859e6b8a8-0",
"resource": {
"memory": 4000000000,
"vcore": 4000
},
"priority": "0",
"nodeId": "node-0001",
"applicationId": "application-0001",
"partition": "default",
"placeholder": false,
"placeholderUsed": true
}
],
"applicationState": "Running",
"user": "system:serviceaccount:kube-system:deployment-controller",
"groups": [
"system:serviceaccounts",
"system:serviceaccounts:kube-system",
"system:authenticated"
],
"rejectedMessage": "",
"stateLog": [
{
"time": 1648741409145224000,
"applicationState": "Accepted"
},
{
"time": 1648741409147432100,
"applicationState": "Running"
}
],
"placeholderData": [
{
"taskGroupName": "task-group-example",
"count": 2,
"minResource": {
"memory": 1000000000,
"vcore": 100
},
"replaced": 1,
"timedout": 1
}
],
"hasReserved": false,
"reservations": []
}

Error response

Code : 500 Internal Server Error

Content examples

{
"status_code": 500,
"message": "system error message. for example, json: invalid UTF-8 in string: ..",
"description": "system error message. for example, json: invalid UTF-8 in string: .."
}

UsersTracker

Get users usage tracking information

Fetch all users usage given a Partition and displays general information about the users managed by YuniKorn.

URL : /ws/v1/partition/{partitionName}/usage/users

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content example

[
{
"userName": "user1",
"groups": {
"app2": "tester"
},
"queues":
{
"queuePath": "root",
"resourceUsage": {
"memory": 12000000000,
"vcore": 12000
},
"runningApplications": ["app1", "app2"],
"children": [
{
"queuePath": "root.default",
"resourceUsage": {
"memory": 6000000000,
"vcore": 6000
},
"runningApplications": ["app1"],
"children": []
},
{
"queuePath": "root.test",
"resourceUsage": {
"memory": 6000000000,
"vcore": 6000
},
"runningApplications": [
"app2"
],
"children": []
}]
}
},
{
"userName": "user2",
"groups": {
"app1": "tester"
},
"queues":
{
"queuePath": "root",
"resourceUsage": {
"memory": 11000000000,
"vcore": 10000
},
"runningApplications": ["app1", "app2", "app3"],
"children": [
{
"queuePath": "root.default",
"resourceUsage": {
"memory": 5000000000,
"vcore": 5000
},
"runningApplications": ["app1"],
"children": []
},
{
"queuePath": "root.test",
"resourceUsage": {
"memory": 4000000000,
"vcore": 4000
},
"runningApplications": [
"app3"
],
"children": []
}]
}
}
]

Error response

Code : 500 Internal Server Error

Content examples

{
"status_code": 500,
"message": "system error message. for example, json: invalid UTF-8 in string: ..",
"description": "system error message. for example, json: invalid UTF-8 in string: .."
}

UserTracker

Get specific user usage tracking information

Fetch specific user usage given a Partition and displays general information about the users managed by YuniKorn.

URL : /ws/v1/partition/{partitionName}/usage/user/{userName}

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content example

{
"userName": "user1",
"groups": {
"app1": "tester"
},
"queues":
{
"queuePath": "root",
"resourceUsage": {
"memory": 12000000000,
"vcore": 12000
},
"runningApplications": ["app1", "app2"],
"children": [
{
"queuePath": "root.default",
"resourceUsage": {
"memory": 6000000000,
"vcore": 6000
},
"runningApplications": ["app1"],
"children": []
},
{
"queuePath": "root.test",
"resourceUsage": {
"memory": 6000000000,
"vcore": 6000
},
"runningApplications": [
"app2"
],
"children": []
}]
}
}

Error response

Code : 500 Internal Server Error

Content examples

{
"status_code": 500,
"message": "system error message. for example, json: invalid UTF-8 in string: ..",
"description": "system error message. for example, json: invalid UTF-8 in string: .."
}

GroupsTracker

Get groups usage tracking information

Fetch all groups usage given a Partition and displays general information about the groups managed by YuniKorn.

URL : /ws/v1/partition/{partitionName}/usage/groups

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content example

[
{
"groupName": "group1",
"applications": ["app1", "app2"],
"queues":
{
"queuePath": "root",
"resourceUsage": {
"memory": 12000000000,
"vcore": 12000
},
"runningApplications": ["app1", "app2"],
"children": [
{
"queuePath": "root.default",
"resourceUsage": {
"memory": 6000000000,
"vcore": 6000
},
"runningApplications": ["app1"],
"children": []
},
{
"queuePath": "root.test",
"resourceUsage": {
"memory": 6000000000,
"vcore": 6000
},
"runningApplications": [
"app2"
],
"children": []
}]
}
},
{
"groupName": "group2",
"applications": ["app1", "app2", "app3"],
"queues":
{
"queuePath": "root",
"resourceUsage": {
"memory": 11000000000,
"vcore": 10000
},
"runningApplications": ["app1", "app2", "app3"],
"children": [
{
"queuePath": "root.default",
"resourceUsage": {
"memory": 5000000000,
"vcore": 5000
},
"runningApplications": ["app1"],
"children": []
},
{
"queuePath": "root.test",
"resourceUsage": {
"memory": 4000000000,
"vcore": 4000
},
"runningApplications": [
"app3"
],
"children": []
}]
}
}
]

Error response

Code : 500 Internal Server Error

Content examples

{
"status_code": 500,
"message": "system error message. for example, json: invalid UTF-8 in string: ..",
"description": "system error message. for example, json: invalid UTF-8 in string: .."
}

GroupTracker

Get specific group usage tracking information

Fetch specific group usage given a Partition and displays general information about the groups managed by YuniKorn.

URL : /ws/v1/partition/{partitionName}/usage/group/{groupName}

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content example

{
"groupName": "group1",
"applications": ["app1", "app2"],
"queues":
{
"queuePath": "root",
"resourceUsage": {
"memory": 12000000000,
"vcore": 12000
},
"runningApplications": ["app1", "app2"],
"children": [
{
"queuePath": "root.default",
"resourceUsage": {
"memory": 6000000000,
"vcore": 6000
},
"runningApplications": ["app1"],
"children": []
},
{
"queuePath": "root.test",
"resourceUsage": {
"memory": 6000000000,
"vcore": 6000
},
"runningApplications": [
"app2"
],
"children": []
}]
}
}

Error response

Code : 500 Internal Server Error

Content examples

{
"status_code": 500,
"message": "system error message. for example, json: invalid UTF-8 in string: ..",
"description": "system error message. for example, json: invalid UTF-8 in string: .."
}

Nodes

Partition nodes

Fetch all Nodes associated with given Partition and displays general information about the nodes managed by YuniKorn. Node details include host and rack name, capacity, resources, utilization, and allocations.

URL : /ws/v1/partition/{partitionName}/nodes

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content examples

Here you can see an example response from a 2-node cluster having 3 allocations.

[
{
"nodeID": "node-0001",
"hostName": "",
"rackName": "",
"attributes": {
"beta.kubernetes.io/arch": "amd64",
"beta.kubernetes.io/os": "linux",
"kubernetes.io/arch": "amd64",
"kubernetes.io/hostname": "node-0001",
"kubernetes.io/os": "linux",
"node-role.kubernetes.io/control-plane": "",
"node-role.kubernetes.io/master": "",
"node.kubernetes.io/exclude-from-external-load-balancers": "",
"ready": "true",
"si.io/hostname": "node-0001",
"si.io/rackname": "/rack-default",
"si/instance-type": "",
"si/node-partition": "[mycluster]default"
},
"capacity": {
"ephemeral-storage": 75850798569,
"hugepages-1Gi": 0,
"hugepages-2Mi": 0,
"memory": 14577000000,
"pods": 110,
"vcore": 10000
},
"allocated": {
"memory": 6000000000,
"vcore": 6000
},
"occupied": {
"memory": 154000000,
"vcore" :750
},
"available": {
"ephemeral-storage": 75850798569,
"hugepages-1Gi": 0,
"hugepages-2Mi": 0,
"memory": 6423000000,
"pods": 110,
"vcore": 1250
},
"utilized": {
"memory": 3,
"vcore": 13
},
"allocations": [
{
"allocationKey": "54e5d77b-f4c3-4607-8038-03c9499dd99d",
"allocationTags": {
"kubernetes.io/label/app": "sleep",
"kubernetes.io/label/applicationId": "application-0001",
"kubernetes.io/label/queue": "root.default",
"kubernetes.io/meta/namespace": "default",
"kubernetes.io/meta/podName": "task0"
},
"requestTime": 1648754034098912461,
"allocationTime": 1648754035973982920,
"allocationDelay": 1875070459,
"uuid": "08033f9a-4699-403c-9204-6333856b41bd",
"allocationID": "08033f9a-4699-403c-9204-6333856b41bd-0",
"resource": {
"memory": 2000000000,
"vcore": 2000
},
"priority": "0",
"nodeId": "node-0001",
"applicationId": "application-0001",
"partition": "default",
"placeholder": false,
"placeholderUsed": false
},
{
"allocationKey": "deb12221-6b56-4fe9-87db-ebfadce9aa20",
"allocationTags": {
"kubernetes.io/label/app": "sleep",
"kubernetes.io/label/applicationId": "application-0002",
"kubernetes.io/label/queue": "root.default",
"kubernetes.io/meta/namespace": "default",
"kubernetes.io/meta/podName": "task0"
},
"requestTime": 1648754034098912461,
"allocationTime": 1648754035973982920,
"allocationDelay": 1875070459,
"uuid": "9af35d44-2d6f-40d1-b51d-758859e6b8a8",
"allocationID": "9af35d44-2d6f-40d1-b51d-758859e6b8a8-0",
"resource": {
"memory": 4000000000,
"vcore": 4000
},
"priority": "0",
"nodeId": "node-0001",
"applicationId": "application-0002",
"partition": "default",
"placeholder": false,
"placeholderUsed": false
}
],
"schedulable": true
},
{
"nodeID": "node-0002",
"hostName": "",
"rackName": "",
"attributes": {
"beta.kubernetes.io/arch": "amd64",
"beta.kubernetes.io/os": "linux",
"kubernetes.io/arch": "amd64",
"kubernetes.io/hostname": "node-0002",
"kubernetes.io/os": "linux",
"ready": "false",
"si.io/hostname": "node-0002",
"si.io/rackname": "/rack-default",
"si/instance-type": "",
"si/node-partition": "[mycluster]default"
},
"capacity": {
"ephemeral-storage": 75850798569,
"hugepages-1Gi": 0,
"hugepages-2Mi": 0,
"memory": 14577000000,
"pods": 110,
"vcore": 10000
},
"allocated": {
"memory": 2000000000,
"vcore": 2000
},
"occupied": {
"memory": 154000000,
"vcore" :750
},
"available": {
"ephemeral-storage": 75850798569,
"hugepages-1Gi": 0,
"hugepages-2Mi": 0,
"memory": 6423000000,
"pods": 110,
"vcore": 1250
},
"utilized": {
"memory": 8,
"vcore": 38
},
"allocations": [
{
"allocationKey": "af3bd2f3-31c5-42dd-8f3f-c2298ebdec81",
"allocationTags": {
"kubernetes.io/label/app": "sleep",
"kubernetes.io/label/applicationId": "application-0001",
"kubernetes.io/label/queue": "root.default",
"kubernetes.io/meta/namespace": "default",
"kubernetes.io/meta/podName": "task1"
},
"requestTime": 1648754034098912461,
"allocationTime": 1648754035973982920,
"allocationDelay": 1875070459,
"uuid": "96beeb45-5ed2-4c19-9a83-2ac807637b3b",
"allocationID": "96beeb45-5ed2-4c19-9a83-2ac807637b3b-0",
"resource": {
"memory": 2000000000,
"vcore": 2000
},
"priority": "0",
"nodeId": "node-0002",
"applicationId": "application-0001",
"partition": "default",
"placeholder": false,
"placeholderUsed": false
}
],
"schedulable": true,
"isReserved": false,
"reservations": []
}
]

Error response

Code : 500 Internal Server Error

Content examples

{
"status_code": 500,
"message": "system error message. for example, json: invalid UTF-8 in string: ..",
"description": "system error message. for example, json: invalid UTF-8 in string: .."
}

Node

Partition node

Fetch a Node associated with given Partition and Node ID and displays general information about the node managed by YuniKorn. Node details include host and rack name, capacity, resources, utilization, and allocations.

URL : /ws/v1/partition/{partitionName}/node/{nodeId}

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content examples

{
"nodeID":"node-0001",
"hostName":"",
"rackName":"",
"capacity":{
"ephemeral-storage":75850798569,
"hugepages-1Gi":0,
"hugepages-2Mi":0,
"memory":14577000000,
"pods":110,
"vcore":10000
},
"allocated":{
"memory":6000000000,
"vcore":6000
},
"occupied":{
"memory":154000000,
"vcore":750
},
"available":{
"ephemeral-storage":75850798569,
"hugepages-1Gi":0,
"hugepages-2Mi":0,
"memory":6423000000,
"pods":110,
"vcore":1250
},
"utilized":{
"memory":3,
"vcore":13
},
"allocations":[
{
"allocationKey":"54e5d77b-f4c3-4607-8038-03c9499dd99d",
"allocationTags":{
"kubernetes.io/label/app":"sleep",
"kubernetes.io/label/applicationId":"application-0001",
"kubernetes.io/label/queue":"root.default",
"kubernetes.io/meta/namespace":"default",
"kubernetes.io/meta/podName":"task0"
},
"requestTime":1648754034098912461,
"allocationTime":1648754035973982920,
"allocationDelay":1875070459,
"uuid":"08033f9a-4699-403c-9204-6333856b41bd",
"allocationID":"08033f9a-4699-403c-9204-6333856b41bd-0",
"resource":{
"memory":2000000000,
"vcore":2000
},
"priority":"0",
"nodeId":"node-0001",
"applicationId":"application-0001",
"partition":"default",
"placeholder":false,
"placeholderUsed":false
},
{
"allocationKey":"deb12221-6b56-4fe9-87db-ebfadce9aa20",
"allocationTags":{
"kubernetes.io/label/app":"sleep",
"kubernetes.io/label/applicationId":"application-0002",
"kubernetes.io/label/queue":"root.default",
"kubernetes.io/meta/namespace":"default",
"kubernetes.io/meta/podName":"task0"
},
"requestTime":1648754034098912461,
"allocationTime":1648754035973982920,
"allocationDelay":1875070459,
"uuid":"9af35d44-2d6f-40d1-b51d-758859e6b8a8",
"allocationID":"9af35d44-2d6f-40d1-b51d-758859e6b8a8-0",
"resource":{
"memory":4000000000,
"vcore":4000
},
"priority":"0",
"nodeId":"node-0001",
"applicationId":"application-0002",
"partition":"default",
"placeholder":false,
"placeholderUsed":false
}
],
"schedulable":true
}

Error response

Code : 500 Internal Server Error

Content examples

{
"status_code": 500,
"message": "system error message. for example, json: invalid UTF-8 in string: ..",
"description": "system error message. for example, json: invalid UTF-8 in string: .."
}

Node utilization

Show how every node is distributed with regard to dominant resource utilization.

Status : Deprecated since v1.5.0 and will be removed in the next major release. Replaced with /ws/v1/scheduler/node-utilizations.

URL : /ws/v1/scheduler/node-utilization

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content examples

{
"type": "vcore",
"utilization": [
{
"bucketName": "0-10%",
"numOfNodes": 1,
"nodeNames": [
"aethergpu"
]
},
{
"bucketName": "10-20%",
"numOfNodes": 2,
"nodeNames": [
"primary-node",
"second-node"
]
},
...
]
}

Error response

Code : 500 Internal Server Error

Content examples

{
"status_code": 500,
"message": "system error message. for example, json: invalid UTF-8 in string: ..",
"description": "system error message. for example, json: invalid UTF-8 in string: .."
}

Node utilizations

Show the nodes utilization of different types of resources in a cluster.

URL : /ws/v1/scheduler/node-utilizations

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content examples

[
{
"clusterId": "mycluster",
"partition": "default",
"utilizations": [
{
"type": "pods",
"utilization": [
{
"bucketName": "0-10%",
"numOfNodes": 2,
"nodeNames": [
"primary-node",
"second-node"
]
},
{
"bucketName": "10-20%"
},
...
]
},
{
"type": "vcores",
"utilization": [
{
"bucketName": "0-10%",
"numOfNodes": 2,
"nodeNames": [
"primary-node",
"second-node"
]
},
{
"bucketName": "10-20%"
},
...
]
},
...
]
}
]

Error response

Code : 500 Internal Server Error

Content examples

{
"status_code": 500,
"message": "system error message. for example, json: invalid UTF-8 in string: ..",
"description": "system error message. for example, json: invalid UTF-8 in string: .."
}

Goroutines info

Dumps the stack traces of the currently running goroutines.

URL : /ws/v1/stack

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content examples

goroutine 356 [running
]:
github.com/apache/yunikorn-core/pkg/webservice.getStackInfo.func1(0x30a0060,
0xc003e900e0,
0x2)
/yunikorn/go/pkg/mod/github.com/apache/yunikorn-core@v0.0.0-20200717041747-f3e1c760c714/pkg/webservice/handlers.go: 41 +0xab
github.com/apache/yunikorn-core/pkg/webservice.getStackInfo(0x30a0060,
0xc003e900e0,
0xc00029ba00)
/yunikorn/go/pkg/mod/github.com/apache/yunikorn-core@v0.0.0-20200717041747-f3e1c760c714/pkg/webservice/handlers.go: 48 +0x71
net/http.HandlerFunc.ServeHTTP(0x2df0e10,
0x30a0060,
0xc003e900e0,
0xc00029ba00)
/usr/local/go/src/net/http/server.go: 1995 +0x52
github.com/apache/yunikorn-core/pkg/webservice.Logger.func1(0x30a0060,
0xc003e900e0,
0xc00029ba00)
/yunikorn/go/pkg/mod/github.com/apache/yunikorn-core@v0.0.0-20200717041747-f3e1c760c714/pkg/webservice/webservice.go: 65 +0xd4
net/http.HandlerFunc.ServeHTTP(0xc00003a570,
0x30a0060,
0xc003e900e0,
0xc00029ba00)
/usr/local/go/src/net/http/server.go: 1995 +0x52
github.com/gorilla/mux.(*Router).ServeHTTP(0xc00029cb40,
0x30a0060,
0xc003e900e0,
0xc0063fee00)
/yunikorn/go/pkg/mod/github.com/gorilla/mux@v1.7.3/mux.go: 212 +0x140
net/http.serverHandler.ServeHTTP(0xc0000df520,
0x30a0060,
0xc003e900e0,
0xc0063fee00)
/usr/local/go/src/net/http/server.go: 2774 +0xcf
net/http.(*conn).serve(0xc0000eab40,
0x30a61a0,
0xc003b74000)
/usr/local/go/src/net/http/server.go: 1878 +0x812
created by net/http.(*Server).Serve
/usr/local/go/src/net/http/server.go: 2884 +0x4c5

goroutine 1 [chan receive,
26 minutes
]:
main.main()
/yunikorn/pkg/shim/main.go: 52 +0x67a

goroutine 19 [syscall,
26 minutes
]:
os/signal.signal_recv(0x1096f91)
/usr/local/go/src/runtime/sigqueue.go: 139 +0x9f
os/signal.loop()
/usr/local/go/src/os/signal/signal_unix.go: 23 +0x30
created by os/signal.init.0
/usr/local/go/src/os/signal/signal_unix.go: 29 +0x4f

...

Error response

Code : 500 Internal Server Error

Content examples

{
"status_code": 500,
"message": "system error message. for example, json: invalid UTF-8 in string: ..",
"description": "system error message. for example, json: invalid UTF-8 in string: .."
}

Metrics

Endpoint to retrieve metrics from the Prometheus server. The metrics are dumped with help messages and type information.

URL : /ws/v1/metrics

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content examples

# HELP go_gc_duration_seconds A summary of the pause duration of garbage collection cycles.
# TYPE go_gc_duration_seconds summary
go_gc_duration_seconds{quantile="0"} 2.567e-05
go_gc_duration_seconds{quantile="0.25"} 3.5727e-05
go_gc_duration_seconds{quantile="0.5"} 4.5144e-05
go_gc_duration_seconds{quantile="0.75"} 6.0024e-05
go_gc_duration_seconds{quantile="1"} 0.00022528
go_gc_duration_seconds_sum 0.021561648
go_gc_duration_seconds_count 436
# HELP go_goroutines Number of goroutines that currently exist.
# TYPE go_goroutines gauge
go_goroutines 82
# HELP go_info Information about the Go environment.
# TYPE go_info gauge
go_info{version="go1.12.17"} 1
# HELP go_memstats_alloc_bytes Number of bytes allocated and still in use.
# TYPE go_memstats_alloc_bytes gauge
go_memstats_alloc_bytes 9.6866248e+07

...

# HELP yunikorn_scheduler_vcore_nodes_usage Nodes resource usage, by resource name.
# TYPE yunikorn_scheduler_vcore_nodes_usage gauge
yunikorn_scheduler_vcore_nodes_usage{range="(10%, 20%]"} 0
yunikorn_scheduler_vcore_nodes_usage{range="(20%,30%]"} 0
yunikorn_scheduler_vcore_nodes_usage{range="(30%,40%]"} 0
yunikorn_scheduler_vcore_nodes_usage{range="(40%,50%]"} 0
yunikorn_scheduler_vcore_nodes_usage{range="(50%,60%]"} 0
yunikorn_scheduler_vcore_nodes_usage{range="(60%,70%]"} 0
yunikorn_scheduler_vcore_nodes_usage{range="(70%,80%]"} 1
yunikorn_scheduler_vcore_nodes_usage{range="(80%,90%]"} 0
yunikorn_scheduler_vcore_nodes_usage{range="(90%,100%]"} 0
yunikorn_scheduler_vcore_nodes_usage{range="[0,10%]"} 0

Configuration validation

URL : /ws/v1/validate-conf

Method : POST

Auth required : NO

Success response

Regardless whether the configuration is allowed or not if the server was able to process the request, it will yield a 200 HTTP status code.

Code : 200 OK

Allowed configuration

Sending the following simple configuration yields an accept

partitions:
- name: default
queues:
- name: root
queues:
- name: test

Reponse

{
"allowed": true,
"reason": ""
}

Disallowed configuration

The following configuration is not allowed due to the "wrong_text" field put into the yaml file.

partitions:
- name: default
queues:
- name: root
queues:
- name: test
- wrong_text

Reponse

{
"allowed": false,
"reason": "yaml: unmarshal errors:\n line 7: cannot unmarshal !!str `wrong_text` into configs.PartitionConfig"
}

Configuration

Endpoint to retrieve the current scheduler configuration

URL : /ws/v1/config

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content example (with Accept: application/json header)

{
"Partitions": [
{
"Name": "default",
"Queues": [
{
"Name": "root",
"Parent": true,
"Resources": {},
"SubmitACL": "*",
"ChildTemplate": {
"Resources": {}
}
}
],
"PlacementRules": [
{
"Name": "tag",
"Create": true,
"Filter": {
"Type": ""
},
"Value": "namespace"
}
],
"Preemption": {
"Enabled": false
},
"NodeSortPolicy": {
"Type": ""
}
}
],
"Checksum": "FD5D3726DF0F02416E02F3919D78F61B15D14425A34142D93B24C137ED056946",
"Extra": {
"event.trackingEnabled": "false",
"log.core.scheduler.level": "info",
"log.core.security.level": "info",
"log.level": "debug"
}
}

Content example (without Accept: application/json header)

partitions:
- name: default
queues:
- name: root
parent: true
submitacl: "*"
placementrules:
- name: tag
create: true
value: namespace
checksum: FD5D3726DF0F02416E02F3919D78F61B15D14425A34142D93B24C137ED056946
extra:
event.trackingEnabled: "false"
log.core.scheduler.level: info
log.core.security.level: info
log.level: debug

Application history

Endpoint to retrieve historical data about the number of total applications by timestamp.

URL : /ws/v1/history/apps

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content examples

[
{
"timestamp": 1595939966153460000,
"totalApplications": "1"
},
{
"timestamp": 1595940026152892000,
"totalApplications": "1"
},
{
"timestamp": 1595940086153799000,
"totalApplications": "2"
},
{
"timestamp": 1595940146154497000,
"totalApplications": "2"
},
{
"timestamp": 1595940206155187000,
"totalApplications": "2"
}
]

Error response

Code : 500 Internal Server Error

Content examples

{
"status_code": 500,
"message": "system error message. for example, json: invalid UTF-8 in string: ..",
"description": "system error message. for example, json: invalid UTF-8 in string: .."
}

Container history

Endpoint to retrieve historical data about the number of total containers by timestamp.

URL : /ws/v1/history/containers

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content examples

[
{
"timestamp": 1595939966153460000,
"totalContainers": "1"
},
{
"timestamp": 1595940026152892000,
"totalContainers": "1"
},
{
"timestamp": 1595940086153799000,
"totalContainers": "3"
},
{
"timestamp": 1595940146154497000,
"totalContainers": "3"
},
{
"timestamp": 1595940206155187000,
"totalContainers": "3"
}
]

Error response

Code : 500 Internal Server Error

Content examples

{
"status_code": 500,
"message": "system error message. for example, json: invalid UTF-8 in string: ..",
"description": "system error message. for example, json: invalid UTF-8 in string: .."
}

Endpoint healthcheck

Endpoint to retrieve historical data about critical logs, negative resource on node/cluster/app, ...

URL : /ws/v1/scheduler/healthcheck

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content examples

{
"Healthy": true,
"HealthChecks": [
{
"Name": "Scheduling errors",
"Succeeded": true,
"Description": "Check for scheduling error entries in metrics",
"DiagnosisMessage": "There were 0 scheduling errors logged in the metrics"
},
{
"Name": "Failed nodes",
"Succeeded": true,
"Description": "Check for failed nodes entries in metrics",
"DiagnosisMessage": "There were 0 failed nodes logged in the metrics"
},
{
"Name": "Negative resources",
"Succeeded": true,
"Description": "Check for negative resources in the partitions",
"DiagnosisMessage": "Partitions with negative resources: []"
},
{
"Name": "Negative resources",
"Succeeded": true,
"Description": "Check for negative resources in the nodes",
"DiagnosisMessage": "Nodes with negative resources: []"
},
{
"Name": "Consistency of data",
"Succeeded": true,
"Description": "Check if a node's allocated resource <= total resource of the node",
"DiagnosisMessage": "Nodes with inconsistent data: []"
},
{
"Name": "Consistency of data",
"Succeeded": true,
"Description": "Check if total partition resource == sum of the node resources from the partition",
"DiagnosisMessage": "Partitions with inconsistent data: []"
},
{
"Name": "Consistency of data",
"Succeeded": true,
"Description": "Check if node total resource = allocated resource + occupied resource + available resource",
"DiagnosisMessage": "Nodes with inconsistent data: []"
},
{
"Name": "Consistency of data",
"Succeeded": true,
"Description": "Check if node capacity >= allocated resources on the node",
"DiagnosisMessage": "Nodes with inconsistent data: []"
},
{
"Name": "Reservation check",
"Succeeded": true,
"Description": "Check the reservation nr compared to the number of nodes",
"DiagnosisMessage": "Reservation/node nr ratio: [0.000000]"
}
]
}

Retrieve full state dump

Endpoint to retrieve the following information in a single response:

  • Current timestamp (Unix timestamp in nanosecond)
  • List of partitions
  • List of applications (running, completed and rejected)
  • Application history
  • Nodes
  • Generic cluster information
  • Container history
  • Queues
  • RMDiagnostics
  • Log level
  • Configuration
  • Placement rules
  • Event stream overview (client hostname and creation timestamp)

URL : /ws/v1/fullstatedump

Method : GET

Auth required : NO

Success response

Code : 200 OK

Content examples

The output of this REST query can be rather large, and it is a combination of those which have already been demonstrated.

The RMDiagnostics shows the content of the K8Shim cache. The exact content is version dependent and has not stabilised. The current content shows the cached objects:

  • nodes
  • pods
  • priorityClasses
  • schedulingState (pod status)

Failure response

Code: 500 Internal Server Error

Batch Events

Endpoint is used to retrieve a batch of event records.

URL: /ws/v1/events/batch

METHOD : GET

Auth required : NO

URL query parameters :

  • count (optional) : Specifies the maxmem number of events to be included in the response.
  • start (optional) : Specifies the starting ID for retrieving events. If the specified ID is outside the ring buffer (too low or too high), the response will include the lowest and highest ID values with EventRecords being empty.

Success response

Code: 200 OK

Content examples

{
"InstanceUUID": "400046c6-2180-41a2-9be1-1c251ab2c498",
"LowestID": 0,
"HighestID": 7,
"EventRecords": [
{
"type": 3,
"objectID": "yk8s-worker",
"message": "schedulable: true",
"timestampNano": 1701347180239597300,
"eventChangeType": 1,
"eventChangeDetail": 302,
"resource": {}
},
{
"type": 3,
"objectID": "yk8s-worker",
"message": "Node added to the scheduler",
"timestampNano": 1701347180239650600,
"eventChangeType": 2,
"resource": {
"resources": {
"ephemeral-storage": {
"value": 502921060352
},
"hugepages-1Gi": {},
"hugepages-2Mi": {},
"memory": {
"value": 33424998400
},
"pods": {
"value": 110
},
"vcore": {
"value": 8000
}
}
}
}
]
}

Error response

Code : 500 Internal Server Error

Event stream

Creates a persistent HTTP connection for event streaming. New events are sent to the clients immediately, so unlike the batch interface, there is no need for polling. The number of active connections is limited. The default setting is 100 connections total and 15 connections per host. The respective configmap properties are event.maxStreams and event.maxStreamsPerHost.

URL: /ws/v1/events/stream

METHOD : GET

Auth required : NO

URL query parameters:

  • count (optional) : Specifies the number of past events (those which have been generated before the connection establishment) to include in the response. Default value is 0.

Success response

Code: 200 OK

Content examples

{"type":2,"objectID":"app-1","timestampNano":1708465452903045265,"eventChangeType":1,"eventChangeDetail":204,"resource":{}}
{"type":2,"objectID":"app-1","timestampNano":1708465452903192898,"eventChangeType":2,"eventChangeDetail":201,"referenceID":"alloc-1","resource":{"resources":{"memory":{"value":10000000},"vcore":{"value":1000}}}}
{"type":3,"objectID":"node-1:1234","timestampNano":1708465452903312146,"eventChangeType":2,"eventChangeDetail":303,"referenceID":"alloc-1","resource":{"resources":{"memory":{"value":10000000},"vcore":{"value":1000}}}}
{"type":2,"objectID":"app-1","timestampNano":1708465452903474210,"eventChangeType":1,"eventChangeDetail":205,"resource":{}}
{"type":5,"objectID":"testuser","timestampNano":1708465452903506166,"eventChangeType":2,"eventChangeDetail":603,"referenceID":"root.singleleaf","resource":{"resources":{"memory":{"value":10000000},"vcore":{"value":1000}}}}

Error responses

Code : 400 Bad Request (URL query is invalid) Code : 503 Service Unavailable (Too many active streaming connections) Code : 500 Internal Server Error