Gour Saha created YARN-8367:
-------------------------------

             Summary: 2 components, one with placement constraint and one 
without causes NPE in SingleConstraintAppPlacementAllocator
                 Key: YARN-8367
                 URL: https://issues.apache.org/jira/browse/YARN-8367
             Project: Hadoop YARN
          Issue Type: Bug
          Components: scheduler
    Affects Versions: 3.1.0
            Reporter: Gour Saha


While testing the fix for YARN-8350, [~billie.rinaldi] encountered this NPE in 
AM log. Filling this on her behalf -
{noformat}
2018-05-25 21:11:54,006 [AMRM Heartbeater thread] ERROR 
impl.AMRMClientAsyncImpl - Exception on heartbeat
java.lang.NullPointerException: java.lang.NullPointerException
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.placement.SingleConstraintAppPlacementAllocator.validateAndSetSchedulingRequest(SingleConstraintAppPlacementAllocator.java:245)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.placement.SingleConstraintAppPlacementAllocator.internalUpdatePendingAsk(SingleConstraintAppPlacementAllocator.java:193)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.placement.SingleConstraintAppPlacementAllocator.updatePendingAsk(SingleConstraintAppPlacementAllocator.java:207)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.AppSchedulingInfo.addSchedulingRequests(AppSchedulingInfo.java:269)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.AppSchedulingInfo.updateSchedulingRequests(AppSchedulingInfo.java:240)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerApplicationAttempt.updateSchedulingRequests(SchedulerApplicationAttempt.java:469)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocate(CapacityScheduler.java:1154)
        at 
org.apache.hadoop.yarn.server.resourcemanager.DefaultAMSProcessor.allocate(DefaultAMSProcessor.java:278)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.constraint.processor.SchedulerPlacementProcessor.allocate(SchedulerPlacementProcessor.java:53)
        at 
org.apache.hadoop.yarn.server.resourcemanager.AMSProcessingChain.allocate(AMSProcessingChain.java:92)
        at 
org.apache.hadoop.yarn.server.resourcemanager.ApplicationMasterService.allocate(ApplicationMasterService.java:433)
        at 
org.apache.hadoop.yarn.api.impl.pb.service.ApplicationMasterProtocolPBServiceImpl.allocate(ApplicationMasterProtocolPBServiceImpl.java:60)
        at 
org.apache.hadoop.yarn.proto.ApplicationMasterProtocol$ApplicationMasterProtocolService$2.callBlockingMethod(ApplicationMasterProtocol.java:99)
        at 
org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:523)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:991)
        at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:872)
        at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:818)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at 
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1682)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2678)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at 
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at 
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
        at 
org.apache.hadoop.yarn.ipc.RPCUtil.instantiateException(RPCUtil.java:53)
        at 
org.apache.hadoop.yarn.ipc.RPCUtil.instantiateRuntimeException(RPCUtil.java:85)
        at 
org.apache.hadoop.yarn.ipc.RPCUtil.unwrapAndThrowException(RPCUtil.java:122)
        at 
org.apache.hadoop.yarn.api.impl.pb.client.ApplicationMasterProtocolPBClientImpl.allocate(ApplicationMasterProtocolPBClientImpl.java:79)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:422)
        at 
org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:165)
        at 
org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:157)
        at 
org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:95)
        at 
org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:359)
        at com.sun.proxy.$Proxy48.allocate(Unknown Source)
        at 
org.apache.hadoop.yarn.client.api.impl.AMRMClientImpl.allocate(AMRMClientImpl.java:313)
        at 
org.apache.hadoop.yarn.client.api.async.impl.AMRMClientAsyncImpl$HeartbeatThread.run(AMRMClientAsyncImpl.java:305)
Caused by: 
org.apache.hadoop.ipc.RemoteException(java.lang.NullPointerException): 
java.lang.NullPointerException
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.placement.SingleConstraintAppPlacementAllocator.validateAndSetSchedulingRequest(SingleConstraintAppPlacementAllocator.java:245)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.placement.SingleConstraintAppPlacementAllocator.internalUpdatePendingAsk(SingleConstraintAppPlacementAllocator.java:193)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.placement.SingleConstraintAppPlacementAllocator.updatePendingAsk(SingleConstraintAppPlacementAllocator.java:207)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.AppSchedulingInfo.addSchedulingRequests(AppSchedulingInfo.java:269)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.AppSchedulingInfo.updateSchedulingRequests(AppSchedulingInfo.java:240)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerApplicationAttempt.updateSchedulingRequests(SchedulerApplicationAttempt.java:469)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler.allocate(CapacityScheduler.java:1154)
        at 
org.apache.hadoop.yarn.server.resourcemanager.DefaultAMSProcessor.allocate(DefaultAMSProcessor.java:278)
        at 
org.apache.hadoop.yarn.server.resourcemanager.scheduler.constraint.processor.SchedulerPlacementProcessor.allocate(SchedulerPlacementProcessor.java:53)
        at 
org.apache.hadoop.yarn.server.resourcemanager.AMSProcessingChain.allocate(AMSProcessingChain.java:92)
        at 
org.apache.hadoop.yarn.server.resourcemanager.ApplicationMasterService.allocate(ApplicationMasterService.java:433)
        at 
org.apache.hadoop.yarn.api.impl.pb.service.ApplicationMasterProtocolPBServiceImpl.allocate(ApplicationMasterProtocolPBServiceImpl.java:60)
        at 
org.apache.hadoop.yarn.proto.ApplicationMasterProtocol$ApplicationMasterProtocolService$2.callBlockingMethod(ApplicationMasterProtocol.java:99)
        at 
org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:523)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:991)
        at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:872)
        at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:818)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at 
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1682)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2678)

        at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1491)
        at org.apache.hadoop.ipc.Client.call(Client.java:1437)
        at org.apache.hadoop.ipc.Client.call(Client.java:1347)
        at 
org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:228)
        at 
org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:116)
        at com.sun.proxy.$Proxy47.allocate(Unknown Source)
        at 
org.apache.hadoop.yarn.api.impl.pb.client.ApplicationMasterProtocolPBClientImpl.allocate(ApplicationMasterProtocolPBClientImpl.java:77)
        ... 12 more
{noformat}
The Yarnfile which can be used to reproduce this problem in a 3.1.0 hadoop 
cluster is provided below -
{code:java}
{
  "name": "test-aa",
  "version": "1",
  "components" :
    [
      {
        "name": "comp-a",
        "number_of_containers": 3,
        "launch_command": "sleep 6000",
        "resource": {
          "cpus": 1,
          "memory": "256"
        },
        "placement_policy": {
          "constraints": [
            {
              "type": "ANTI_AFFINITY",
              "scope": "NODE",
              "target_tags": [
                "comp-a"
              ]
            }
          ]
        }
      },
      {
        "name": "comp-b",
        "number_of_containers": 2,
        "launch_command": "sleep 6000",
        "resource": {
          "cpus": 1,
          "memory": "256"
        },
        "placement_policy": {
          "constraints": [
          ]
        }
      }
    ]
}
{code}
The scheduler should support this mixed scenario where some components of an 
application have placement constraints whereas some don't.



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