从协议VersionedProtocol开始4——AdminOperationsProtocol、InterTrackerProtocol、JobSubmissionProtocol、TaskUmbilicalProtocol

1、package org.apache.hadoop.mapred这四个协议都在这个包下。

2、从最简单的AdminOperationsProtocol看，

void refreshQueues() throws IOException;

void refreshNodes() throws IOException;

boolean setSafeMode(JobTracker.SafeModeAction safeModeAction)  throws IOException;

3、相对于hdfs里边那几个协议，这几个协议都经常修改，不是很稳定

InterTrackerProtocol

HeartbeatResponse heartbeat(TaskTrackerStatus status,
                            boolean restarted,
                            boolean initialContact,
                            boolean acceptNewTasks,
                            short responseId)
  throws IOException;

public String getFilesystemName() throws IOException;

public void reportTaskTrackerError(String taskTracker,
                                   String errorClass,
                                   String errorMessage) throws IOException;

TaskCompletionEvent[] getTaskCompletionEvents(JobID jobid, int fromEventId
    , int maxEvents) throws IOException;

public String getSystemDir();

public String getBuildVersion() throws IOException;

public String getVIVersion() throws IOException;

JobSubmissionProtocol

public JobID getNewJobId() throws IOException;

public JobStatus submitJob(JobID jobName, String jobSubmitDir, Credentials ts)
throws IOException;

public ClusterStatus getClusterStatus(boolean detailed) throws IOException;

public AccessControlList getQueueAdmins(String queueName) throws IOException;

public void killJob(JobID jobid) throws IOException;

public void setJobPriority(JobID jobid, String priority)
                                                    throws IOException;

public boolean killTask(TaskAttemptID taskId, boolean shouldFail) throws IOException;

public JobProfile getJobProfile(JobID jobid) throws IOException;

public JobStatus getJobStatus(JobID jobid) throws IOException;

public Counters getJobCounters(JobID jobid) throws IOException;

public TaskReport[] getMapTaskReports(JobID jobid) throws IOException;

public TaskReport[] getReduceTaskReports(JobID jobid) throws IOException;

public TaskReport[] getCleanupTaskReports(JobID jobid) throws IOException;

public TaskReport[] getSetupTaskReports(JobID jobid) throws IOException;

public String getFilesystemName() throws IOException;

public JobStatus[] jobsToComplete() throws IOException;

public JobStatus[] getAllJobs() throws IOException;

public TaskCompletionEvent[] getTaskCompletionEvents(JobID jobid
    , int fromEventId, int maxEvents) throws IOException;

public String[] getTaskDiagnostics(TaskAttemptID taskId)
throws IOException;
  public String getSystemDir();

public String getStagingAreaDir() throws IOException;

public JobQueueInfo[] getQueues() throws IOException;

public JobQueueInfo getQueueInfo(String queue) throws IOException;

public JobStatus[] getJobsFromQueue(String queue) throws IOException;

public QueueAclsInfo[] getQueueAclsForCurrentUser() throws IOException;

public
Token<DelegationTokenIdentifier> getDelegationToken(Text renewer
                                                    ) throws IOException,
                                                        InterruptedException;

public long renewDelegationToken(Token<DelegationTokenIdentifier> token
                                 ) throws IOException,
                                          InterruptedException;

public void cancelDelegationToken(Token<DelegationTokenIdentifier> token
                                  ) throws IOException,InterruptedException;

TaskUmbilicalProtocol

JvmTask getTask(JvmContext context) throws IOException;

boolean statusUpdate(TaskAttemptID taskId, TaskStatus taskStatus,
    JvmContext jvmContext) throws IOException, InterruptedException;

void reportDiagnosticInfo(TaskAttemptID taskid, String trace,
    JvmContext jvmContext) throws IOException;

void reportNextRecordRange(TaskAttemptID taskid, SortedRanges.Range range,
    JvmContext jvmContext) throws IOException;

boolean ping(TaskAttemptID taskid, JvmContext jvmContext) throws IOException;

void done(TaskAttemptID taskid, JvmContext jvmContext) throws IOException;
void commitPending(TaskAttemptID taskId, TaskStatus taskStatus,
    JvmContext jvmContext) throws IOException, InterruptedException;

boolean canCommit(TaskAttemptID taskid, JvmContext jvmContext) throws IOException;

void shuffleError(TaskAttemptID taskId, String message, JvmContext jvmContext)
    throws IOException;

void fsError(TaskAttemptID taskId, String message, JvmContext jvmContext)
    throws IOException;

void fatalError(TaskAttemptID taskId, String message, JvmContext jvmContext)
    throws IOException;

MapTaskCompletionEventsUpdate getMapCompletionEvents(JobID jobId,
                                                     int fromIndex,
                                                     int maxLocs,
                                                     TaskAttemptID id,
                                                     JvmContext jvmContext)
throws IOException;

void updatePrivateDistributedCacheSizes(org.apache.hadoop.mapreduce.JobID jobId,
                                        long[] sizes) throws IOException;