ClusterStatus (Apache Hadoop Main 3.0.0-alpha2-SNAPSHOT API)

java.lang.Object
- org.apache.hadoop.mapred.ClusterStatus

すべての実装されたインタフェース:

Writable
```
@InterfaceAudience.Public
 @InterfaceStability.Stable
public class ClusterStatus
extends Object
implements 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 and reduce tasks.
5. State of the JobTracker.
6. Details regarding black listed trackers.
Clients can query for the latest ClusterStatus, via JobClient.getClusterStatus().
関連項目:

JobClient

フィールドのサマリー

フィールド
修飾子とタイプフィールドと説明

static long UNINITIALIZED_MEMORY_VALUE

フィールド
修飾子とタイプ	フィールドと説明
`static long`	`UNINITIALIZED_MEMORY_VALUE`

メソッドのサマリー

すべてのメソッドインスタンス・メソッド concreteメソッド非推奨のメソッド
修飾子とタイプ	メソッドと説明
`Collection<String>`	`getActiveTrackerNames()` Get the names of task trackers in the cluster.
`Collection<String>`	`getBlacklistedTrackerNames()` Get the names of task trackers in the cluster.
`int`	`getBlacklistedTrackers()` Get the number of blacklisted task trackers in the cluster.
`Collection<org.apache.hadoop.mapred.ClusterStatus.BlackListInfo>`	`getBlackListedTrackersInfo()` Gets the list of blacklisted trackers along with reasons for blacklisting.
`Collection<String>`	`getGraylistedTrackerNames()` 非推奨です。
`int`	`getGraylistedTrackers()` 非推奨です。
`org.apache.hadoop.mapred.JobTracker.State`	`getJobTrackerState()` 非推奨です。
`org.apache.hadoop.mapreduce.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()` 非推奨です。
`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()` 非推奨です。
`void`	`readFields(DataInput in)` Deserialize the fields of this object from `in`.
`void`	`write(DataOutput out)` Serialize the fields of this object to `out`.

クラスから継承されたメソッド java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- フィールドの詳細
  - UNINITIALIZED_MEMORY_VALUE
```
public static final long UNINITIALIZED_MEMORY_VALUE
```
    関連項目:
    
    定数フィールド値
- メソッドの詳細
  - getTaskTrackers
```
public int getTaskTrackers()
```
    Get the number of task trackers in the cluster.
    
    戻り値:
    
    the number of task trackers in the cluster.
  - getActiveTrackerNames
```
public Collection<String> getActiveTrackerNames()
```
    Get the names of task trackers in the cluster.
    
    戻り値:
    
    the active task trackers in the cluster.
  - getBlacklistedTrackerNames
```
public Collection<String> getBlacklistedTrackerNames()
```
    Get the names of task trackers in the cluster.
    
    戻り値:
    
    the blacklisted task trackers in the cluster.
  - getGraylistedTrackerNames
```
@Deprecated
public Collection<String> getGraylistedTrackerNames()
```
    非推奨です。
    
    Get the names of graylisted task trackers in the cluster. The gray list of trackers is no longer available on M/R 2.x. The function is kept to be compatible with M/R 1.x applications.
    
    戻り値:
    
    an empty graylisted task trackers in the cluster.
  - getGraylistedTrackers
```
@Deprecated
public int getGraylistedTrackers()
```
    非推奨です。
    
    Get the number of graylisted task trackers in the cluster. The gray list of trackers is no longer available on M/R 2.x. The function is kept to be compatible with M/R 1.x applications.
    
    戻り値:
    
    0 graylisted task trackers in the cluster.
  - getBlacklistedTrackers
```
public int getBlacklistedTrackers()
```
    Get the number of blacklisted task trackers in the cluster.
    
    戻り値:
    
    the number of blacklisted task trackers in the cluster.
  - getNumExcludedNodes
```
public int getNumExcludedNodes()
```
    Get the number of excluded hosts in the cluster.
    
    戻り値:
    
    the number of excluded hosts in the cluster.
  - getTTExpiryInterval
```
public long getTTExpiryInterval()
```
    Get the tasktracker expiry interval for the cluster
    
    戻り値:
    
    the expiry interval in msec
  - getMapTasks
```
public int getMapTasks()
```
    Get the number of currently running map tasks in the cluster.
    
    戻り値:
    
    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.
    
    戻り値:
    
    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.
    
    戻り値:
    
    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.
    
    戻り値:
    
    the maximum capacity for running reduce tasks in the cluster.
  - getJobTrackerStatus
```
public org.apache.hadoop.mapreduce.Cluster.JobTrackerStatus getJobTrackerStatus()
```
    Get the JobTracker's status.
    
    戻り値:
    
    Cluster.JobTrackerStatus of the JobTracker
  - getMaxMemory
```
@Deprecated
public long getMaxMemory()
```
    非推奨です。
    
    Returns UNINITIALIZED_MEMORY_VALUE (-1)
  - getUsedMemory
```
@Deprecated
public long getUsedMemory()
```
    非推奨です。
    
    Returns UNINITIALIZED_MEMORY_VALUE (-1)
  - getBlackListedTrackersInfo
```
public Collection<org.apache.hadoop.mapred.ClusterStatus.BlackListInfo> getBlackListedTrackersInfo()
```
    Gets the list of blacklisted trackers along with reasons for blacklisting.
    
    戻り値:
    
    the collection of ClusterStatus.BlackListInfo objects.
  - getJobTrackerState
```
@Deprecated
public org.apache.hadoop.mapred.JobTracker.State getJobTrackerState()
```
    非推奨です。
    
    Get the current state of the JobTracker, as JobTracker.State JobTracker.State should no longer be used on M/R 2.x. The function is kept to be compatible with M/R 1.x applications.
    
    戻り値:
    
    the invalid state of the JobTracker.
  - write
```
public void write(DataOutput out)
           throws IOException
```
    インタフェースからコピーされた説明: Writable
    
    Serialize the fields of this object to out.
    
    定義:
    
    write インタフェース内 Writable
    
    パラメータ:
    
    out - DataOuput to serialize this object into.
    
    例外:
    
    IOException
  - readFields
```
public void readFields(DataInput in)
                throws IOException
```
    インタフェースからコピーされた説明: Writable
    
    Deserialize the fields of this object from in.
    For efficiency, implementations should attempt to re-use storage in the existing object where possible.
    
    定義:
    
    readFields インタフェース内 Writable
    
    パラメータ:
    
    in - DataInput to deseriablize this object from.
    
    例外:
    
    IOException

クラス ClusterStatus

フィールドのサマリー

メソッドのサマリー

クラスから継承されたメソッド java.lang.Object

フィールドの詳細

UNINITIALIZED_MEMORY_VALUE

メソッドの詳細

getTaskTrackers

getActiveTrackerNames

getBlacklistedTrackerNames

getGraylistedTrackerNames

getGraylistedTrackers

getBlacklistedTrackers

getNumExcludedNodes

getTTExpiryInterval

getMapTasks

getReduceTasks

getMaxMapTasks

getMaxReduceTasks

getJobTrackerStatus

getMaxMemory

getUsedMemory

getBlackListedTrackersInfo

getJobTrackerState

write

readFields