org.apache.hadoop.yarn.server.resourcemanager.labelmanagement

Class LabelManager

java.lang.Object

org.apache.hadoop.yarn.server.resourcemanager.labelmanagement.LabelManager

public class LabelManager
extends Object

LabelManager class is a service that provides ability to deal with label based scheduling - namely helps to schedule containers on predefined set of nodes This service's responsibility include: 1. Reading file with the labels from DFS and periodically refreshing it if it was changed 2. Create label expressions based String provided 3. Create label expressions based on combination of Label Expressions and Policies 4. Evaluate expression for a node to determine whether the node in question has needed labels or not.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	LabelManager.LabelApplicabilityStatus

Field Summary

Fields

Modifier and Type	Field and Description
static long	DEFAULT_RELOAD_INTERVAL
static String	NODE_LABELS_FILE
static String	NODE_LABELS_MONITOR_INTERVAL

Method Summary

Methods

Modifier and Type	Method and Description
net.java.dev.eval.Expression	constructAppLabel(Queue.QueueLabelPolicy policy, net.java.dev.eval.Expression appLabelExpression, net.java.dev.eval.Expression queueLabelExpression)
net.java.dev.eval.Expression	getEffectiveLabelExpr(String appLabelStr)
static LabelManager	getInstance()
org.apache.hadoop.fs.Path	getLabelFile()
List<org.apache.hadoop.yarn.api.records.NodeToLabelsList>	getLabelsForAllNodes()
Set<String>	getLabelsForNode(String node)
LabelManager.LabelApplicabilityStatus	isNodeApplicableForApp(String node, net.java.dev.eval.Expression finalAppLabelExp)
boolean	isServiceEnabled()
void	refreshLabels() Read a line from file and parse node identifier and labels.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

NODE_LABELS_FILE

public static final String NODE_LABELS_FILE

See Also:

Constant Field Values

NODE_LABELS_MONITOR_INTERVAL

public static final String NODE_LABELS_MONITOR_INTERVAL

See Also:

Constant Field Values

DEFAULT_RELOAD_INTERVAL

public static final long DEFAULT_RELOAD_INTERVAL

See Also:

Constant Field Values

Method Detail

getInstance

public static LabelManager getInstance()

isServiceEnabled

public boolean isServiceEnabled()

Returns:

whether service is enabled and worth using it

refreshLabels

@InterfaceAudience.Private
public void refreshLabels()
                   throws IOException

Read a line from file and parse node identifier and labels.

Throws:

IOException

getLabelsForNode

public Set<String> getLabelsForNode(String node)

getLabelsForAllNodes

public List<org.apache.hadoop.yarn.api.records.NodeToLabelsList> getLabelsForAllNodes()

getEffectiveLabelExpr

public net.java.dev.eval.Expression getEffectiveLabelExpr(String appLabelStr)
                                                   throws IOException

Throws:

IOException

constructAppLabel

public net.java.dev.eval.Expression constructAppLabel(Queue.QueueLabelPolicy policy,
                                             net.java.dev.eval.Expression appLabelExpression,
                                             net.java.dev.eval.Expression queueLabelExpression)

isNodeApplicableForApp

public LabelManager.LabelApplicabilityStatus isNodeApplicableForApp(String node,
                                                           net.java.dev.eval.Expression finalAppLabelExp)
                                                             throws IOException

Throws:

IOException

getLabelFile

public org.apache.hadoop.fs.Path getLabelFile()