org.apache.hadoop.mapred
Class ClusterStatus

java.lang.Object
  extended by org.apache.hadoop.mapred.ClusterStatus
All Implemented Interfaces:
org.apache.hadoop.io.Writable

public class ClusterStatus
extends java.lang.Object
implements org.apache.hadoop.io.Writable

Status information on the current state of the Map-Reduce cluster.

ClusterStatus provides clients with information such as:

  1. Size of the cluster.
  2. Name of the trackers.
  3. Task capacity of the cluster.
  4. The number of currently running map & reduce tasks.
  5. State of the JobTracker.

Clients can query for the latest ClusterStatus, via JobClient.getClusterStatus().

See Also:
JobClient

Field Summary
static long UNINITIALIZED_MEMORY_VALUE
           
 
Method Summary
 java.util.Collection<java.lang.String> getActiveTrackerNames()
          Get the names of task trackers in the cluster.
 java.util.Collection<java.lang.String> getBlacklistedTrackerNames()
          Get the names of task trackers in the cluster.
 int getBlacklistedTrackers()
          Get the number of blacklisted task trackers in the cluster.
 Cluster.JobTrackerStatus getJobTrackerStatus()
          Get the JobTracker's status.
 int getMapTasks()
          Get the number of currently running map tasks in the cluster.
 int getMaxMapTasks()
          Get the maximum capacity for running map tasks in the cluster.
 long getMaxMemory()
          Deprecated. 
 int getMaxReduceTasks()
          Get the maximum capacity for running reduce tasks in the cluster.
 int getNumExcludedNodes()
          Get the number of excluded hosts in the cluster.
 int getReduceTasks()
          Get the number of currently running reduce tasks in the cluster.
 int getTaskTrackers()
          Get the number of task trackers in the cluster.
 long getTTExpiryInterval()
          Get the tasktracker expiry interval for the cluster
 long getUsedMemory()
          Deprecated. 
 void readFields(java.io.DataInput in)
           
 void write(java.io.DataOutput out)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

UNINITIALIZED_MEMORY_VALUE

public static final long UNINITIALIZED_MEMORY_VALUE
See Also:
Constant Field Values
Method Detail

getTaskTrackers

public int getTaskTrackers()
Get the number of task trackers in the cluster.

Returns:
the number of task trackers in the cluster.

getActiveTrackerNames

public java.util.Collection<java.lang.String> getActiveTrackerNames()
Get the names of task trackers in the cluster.

Returns:
the active task trackers in the cluster.

getBlacklistedTrackerNames

public java.util.Collection<java.lang.String> getBlacklistedTrackerNames()
Get the names of task trackers in the cluster.

Returns:
the blacklisted task trackers in the cluster.

getBlacklistedTrackers

public int getBlacklistedTrackers()
Get the number of blacklisted task trackers in the cluster.

Returns:
the number of blacklisted task trackers in the cluster.

getNumExcludedNodes

public int getNumExcludedNodes()
Get the number of excluded hosts in the cluster.

Returns:
the number of excluded hosts in the cluster.

getTTExpiryInterval

public long getTTExpiryInterval()
Get the tasktracker expiry interval for the cluster

Returns:
the expiry interval in msec

getMapTasks

public int getMapTasks()
Get the number of currently running map tasks in the cluster.

Returns:
the number of currently running map tasks in the cluster.

getReduceTasks

public int getReduceTasks()
Get the number of currently running reduce tasks in the cluster.

Returns:
the number of currently running reduce tasks in the cluster.

getMaxMapTasks

public int getMaxMapTasks()
Get the maximum capacity for running map tasks in the cluster.

Returns:
the maximum capacity for running map tasks in the cluster.

getMaxReduceTasks

public int getMaxReduceTasks()
Get the maximum capacity for running reduce tasks in the cluster.

Returns:
the maximum capacity for running reduce tasks in the cluster.

getJobTrackerStatus

public Cluster.JobTrackerStatus getJobTrackerStatus()
Get the JobTracker's status.

Returns:
Cluster.JobTrackerStatus of the JobTracker

getUsedMemory

@Deprecated
public long getUsedMemory()
Deprecated. 

Get the total heap memory used by the JobTracker

Returns:
the size of heap memory used by the JobTracker

getMaxMemory

@Deprecated
public long getMaxMemory()
Deprecated. 

Get the maximum configured heap memory that can be used by the JobTracker

Returns:
the configured size of max heap memory that can be used by the JobTracker

write

public void write(java.io.DataOutput out)
           throws java.io.IOException
Specified by:
write in interface org.apache.hadoop.io.Writable
Throws:
java.io.IOException

readFields

public void readFields(java.io.DataInput in)
                throws java.io.IOException
Specified by:
readFields in interface org.apache.hadoop.io.Writable
Throws:
java.io.IOException


Copyright © 2009 The Apache Software Foundation