@InterfaceAudience.Private @InterfaceStability.Unstable public class FifoPolicy extends SchedulingPolicy
| Modifier and Type | Field and Description | 
|---|---|
| static String | NAME | 
DEFAULT_POLICY| Constructor and Description | 
|---|
| FifoPolicy() | 
| Modifier and Type | Method and Description | 
|---|---|
| boolean | checkIfUsageOverFairShare(org.apache.hadoop.yarn.api.records.Resource usage,
                         org.apache.hadoop.yarn.api.records.Resource fairShare)Check if the resource usage is over the fair share under this policy. | 
| void | computeShares(Collection<? extends Schedulable> schedulables,
             org.apache.hadoop.yarn.api.records.Resource totalResources)Computes and updates the shares of  Schedulables as per
 theSchedulingPolicy, to be used later for scheduling decisions. | 
| void | computeSteadyShares(Collection<? extends FSQueue> queues,
                   org.apache.hadoop.yarn.api.records.Resource totalResources)Computes and updates the steady shares of  FSQueues as per theSchedulingPolicy. | 
| Comparator<Schedulable> | getComparator()The comparator returned by this method is to be used for sorting the
  Schedulables in that queue. | 
| org.apache.hadoop.yarn.api.records.Resource | getHeadroom(org.apache.hadoop.yarn.api.records.Resource queueFairShare,
           org.apache.hadoop.yarn.api.records.Resource queueUsage,
           org.apache.hadoop.yarn.api.records.Resource maxAvailable)Get headroom by calculating the min of  clusterAvailableand
 (queueFairShare-queueUsage) resources that are
 applicable to this policy. | 
| String | getName() | 
| org.apache.hadoop.yarn.util.resource.ResourceCalculator | getResourceCalculator()The  ResourceCalculatorreturned by this method should be used
 for any calculations involving resources. | 
| boolean | isChildPolicyAllowed(SchedulingPolicy childPolicy)Check whether the policy of a child queue is allowed. | 
getInstance, initialize, initialize, parsepublic static final String NAME
public String getName()
getName in class SchedulingPolicySchedulingPolicypublic Comparator<Schedulable> getComparator()
SchedulingPolicySchedulables in that queue.getComparator in class SchedulingPolicypublic org.apache.hadoop.yarn.util.resource.ResourceCalculator getResourceCalculator()
SchedulingPolicyResourceCalculator returned by this method should be used
 for any calculations involving resources.getResourceCalculator in class SchedulingPolicypublic void computeShares(Collection<? extends Schedulable> schedulables, org.apache.hadoop.yarn.api.records.Resource totalResources)
SchedulingPolicySchedulables as per
 the SchedulingPolicy, to be used later for scheduling decisions.
 The shares computed are instantaneous and only consider queues with
 running applications.computeShares in class SchedulingPolicyschedulables - Schedulables whose shares are to be updatedtotalResources - Total Resources in the clusterpublic void computeSteadyShares(Collection<? extends FSQueue> queues, org.apache.hadoop.yarn.api.records.Resource totalResources)
SchedulingPolicyFSQueues as per the
 SchedulingPolicy. The steady share does not differentiate
 between queues with and without running applications under them. The
 steady share is not used for scheduling, it is displayed on the Web UI
 for better visibility.computeSteadyShares in class SchedulingPolicyqueues - FSQueues whose shares are to be updatedtotalResources - Total Resources in the clusterpublic boolean checkIfUsageOverFairShare(org.apache.hadoop.yarn.api.records.Resource usage,
                                         org.apache.hadoop.yarn.api.records.Resource fairShare)
SchedulingPolicycheckIfUsageOverFairShare in class SchedulingPolicyusage - Resource the resource usagefairShare - Resource the fair sharepublic org.apache.hadoop.yarn.api.records.Resource getHeadroom(org.apache.hadoop.yarn.api.records.Resource queueFairShare,
                                                               org.apache.hadoop.yarn.api.records.Resource queueUsage,
                                                               org.apache.hadoop.yarn.api.records.Resource maxAvailable)
SchedulingPolicyclusterAvailable and
 (queueFairShare - queueUsage) resources that are
 applicable to this policy. For eg if only memory then leave other
 resources such as CPU to same as clusterAvailable.getHeadroom in class SchedulingPolicyqueueFairShare - fairshare in the queuequeueUsage - resources used in the queuemaxAvailable - available resource in cluster for this queuepublic boolean isChildPolicyAllowed(SchedulingPolicy childPolicy)
SchedulingPolicyisChildPolicyAllowed in class SchedulingPolicychildPolicy - the policy of child queueCopyright © 2008–2023 Apache Software Foundation. All rights reserved.