org.apache.hadoop.mapred.JobTracker
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`hadoop 0.20.2-cdh3u4` | Overview | Package | Class | Statistics | Help
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## Class org.apache.hadoop.mapred.`JobTracker`

Added interfaces `org.apache.hadoop.mapred.AdminOperationsProtocol, org.apache.hadoop.mapred.JobTrackerMXBean, org.apache.hadoop.security.RefreshUserMappingsProtocol, org.apache.hadoop.security.authorize.RefreshAuthorizationPolicyProtocol, org.apache.hadoop.tools.GetUserMappingsProtocol`.

Added Methods
`Collection` `activeTaskTrackers`() | Get the active task tracker statuses in the cluster
`Collection` `blacklistedTaskTrackers`() | Get the blacklisted task tracker statuses in the cluster
`void` `cancelDelegationToken`(`Token`) | Discard a current delegation token.
`void` `failJob`(`JobInProgress`) | Fail a job and inform the listeners.
`String` `getAliveNodesInfoJson`() |
`String` `getBlacklistedNodesInfoJson`() |
`Clock` `getClock`() |
`ClusterMetrics` `getClusterMetrics`() |
`ClusterStatus` `getClusterStatus`(`boolean`) |
`List` `getCompletedJobs`() |
`JobConf` `getConf`() | Returns a handle to the JobTracker's Configuration
`String` `getConfigVersion`() |
`Token` `getDelegationToken`(`Text`) | Get a new delegation token.
`DelegationTokenSecretManager` `getDelegationTokenSecretManager`() |
`List` `getFailedJobs`() |
`String[]` `getGroupsForUser`(`String`) |
`String` `getHostname`() |
`QueueAclsInfo[]` `getQueueAclsForCurrentUser`() |
`AccessControlList` `getQueueAdmins`(`String`) | @see org.apache.hadoop.mapred.JobSubmissionProtocol#getQueueAdmins(String)
`String` `getQueueInfoJson`() |
`String` `getStagingAreaDir`() | @see org.apache.hadoop.mapred.JobSubmissionProtocol#getStagingAreaDir()
`String` `getSummaryJson`() |
`TaskTrackerStatus` `getTaskTrackerStatus`(`String`) |
`int` `getThreadCount`() |
`String` `getVIVersion`() |
`String` `getVersion`() |
`void` `initJob`(`JobInProgress`) |
`boolean` `isBlacklisted`(`String`) | Whether the tracker is blacklisted or not
`void` `refreshNodes`() | Rereads the config to get hosts and exclude list file names.
`void` `refreshQueues`() |
`void` `refreshServiceAcl`() |
`void` `refreshSuperUserGroupsConfiguration`() |
`void` `refreshUserToGroupsMappings`() |
`long` `renewDelegationToken`(`Token`) | Renew a delegation token to extend its lifetime.
`JobTracker` `startTracker`(`JobConf,` String) |
`List` `taskTrackerNames`() | Get the active and blacklisted task tracker names in the cluster.

Changed Methods
`Vector` `completedJobs`() | Change in return type from `JobInProgress>` to `Vector`. |
`Vector` `failedJobs`() | Change in return type from `JobInProgress>` to `Vector`. |
`TaskReport[]` `getCleanupTaskReports`(`JobID`) | Change in exceptions thrown from no exceptions to `java.io.IOException`. |
`Class` `getInstrumentationClass`(`Configuration`) | Change in return type from (`Class`) to `Class`. |
`Counters` `getJobCounters`(`JobID`) | Change in exceptions thrown from no exceptions to `java.io.IOException`. |
`TaskReport[]` `getMapTaskReports`(`JobID`) | Change in exceptions thrown from no exceptions to `java.io.IOException`. |
`Collection` `getNodesAtMaxLevel`() | Change in return type from `Node>` to `Collection`. | Returns a collection of nodes at the max level
`TaskReport[]` `getReduceTaskReports`(`JobID`) | Change in exceptions thrown from no exceptions to `java.io.IOException`. |
`List` `getRunningJobs`() | Change in return type from `JobInProgress>` to `List`. | Version that is called from a timer thread and therefore needs to be careful to synchronize.
`TaskReport[]` `getSetupTaskReports`(`JobID`) | Change in exceptions thrown from no exceptions to `java.io.IOException`. |
`TaskTracker` `getTaskTracker`(`String`) | Change in return type from `TaskTrackerStatus` to `TaskTracker`. |
`HeartbeatResponse` `heartbeat`(`TaskTrackerStatus,` boolean, boolean, boolean, short) | Change in signature from (`TaskTrackerStatus, boolean, boolean, short`) to (`TaskTrackerStatus, boolean, boolean, boolean, short`). | The periodic heartbeat mechanism between the TaskTracker and the JobTracker The JobTracker processes the status information sent by the TaskTracker and responds with instructions to start/stop tasks or jobs and also 'reset' instructions during contingencies.
`Vector` `runningJobs`() | Change in return type from `JobInProgress>` to `Vector`. |
`void` `setInstrumentationClass`(`Configuration,` Class) | Change in signature from (`Configuration, Class`) to (`Configuration, Class`). |
`JobStatus` `submitJob`(`JobID,` String, Credentials) | Change in signature from `JobID` to (`JobID, String, Credentials`). | JobTracker.submitJob() kicks off a new job.
`Collection` `taskTrackers`() | Change in return type from `TaskTrackerStatus>` to `Collection`. | Get all the task trackers in the cluster
`ClusterStatus` `getClusterStatus`() | Now deprecated. | use {@link #getClusterStatus(boolean)}

Added Fields
`long` `DELEGATION_KEY_UPDATE_INTERVAL_DEFAULT` |
`String` `DELEGATION_KEY_UPDATE_INTERVAL_KEY` |
`long` `DELEGATION_TOKEN_MAX_LIFETIME_DEFAULT` |
`String` `DELEGATION_TOKEN_MAX_LIFETIME_KEY` |
`long` `DELEGATION_TOKEN_RENEW_INTERVAL_DEFAULT` |
`String` `DELEGATION_TOKEN_RENEW_INTERVAL_KEY` |
`String` `JT_KEYTAB_FILE` |
`String` `JT_USER_NAME` |
`String` `MAPRED_CLUSTER_MAP_MEMORY_MB_PROPERTY` |
`String` `MAPRED_CLUSTER_REDUCE_MEMORY_MB_PROPERTY` |
`String` `MAX_USER_JOBCONF_SIZE_KEY` | the config key for max user jobconf size

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