org.apache.hadoop.mapred.JobTracker
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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.tools.GetUserMappingsProtocol`.

Added Methods
`void` `cancelDelegationToken`(`Token`) | Discard a current delegation token.
`String` `getAliveNodesInfoJson`() |
`String` `getBlacklistedNodesInfoJson`() |
`Clock` `getClock`() |
`ClusterMetrics` `getClusterMetrics`() |
`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` `getVersion`() |
`void` `refreshNodes`() | Rereads the config to get hosts and exclude list file names.
`void` `refreshQueues`() |
`void` `refreshSuperUserGroupsConfiguration`() |
`void` `refreshUserToGroupsMappings`() |
`long` `renewDelegationToken`(`Token`) | Renew a delegation token to extend its lifetime.

Changed Methods
`TaskReport[]` `getCleanupTaskReports`(`JobID`) | Change in exceptions thrown from no exceptions to `java.io.IOException`. |
`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`. |
`TaskReport[]` `getReduceTaskReports`(`JobID`) | Change in exceptions thrown from no exceptions to `java.io.IOException`. |
`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`. |
`JobStatus` `submitJob`(`JobID,` String, Credentials) | Change in signature from `JobID` to (`JobID, String, Credentials`). | JobTracker.submitJob() kicks off a new job.

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` `MAX_USER_JOBCONF_SIZE_KEY` | the config key for max user jobconf size

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