org.apache.hadoop.mapred.JobTracker
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## Class org.apache.hadoop.mapred.`JobTracker`

Added interface `org.apache.hadoop.security.authorize.RefreshAuthorizationPolicyProtocol`.

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` `failJob`(`JobInProgress`) | Fail a job and inform the listeners.
`ClusterStatus` `getClusterStatus`(`boolean`) |
`void` `initJob`(`JobInProgress`) |
`boolean` `isBlacklisted`(`String`) | Whether the tracker is blacklisted or not
`void` `refreshServiceAcl`() |
`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`. |
`Class` `getInstrumentationClass`(`Configuration`) | Change in return type from (`Class`) to `Class`. |
`Collection` `getNodesAtMaxLevel`() | Change in return type from `Node>` to `Collection`. | Returns a collection of nodes at the max level
`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.
`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`). |
`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)}

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