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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.mapred;
import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration;
/**
* RunningJob is the user-interface to query for details on a
* running Map-Reduce job.
*
* Clients can get hold of RunningJob via the {@link JobClient}
* and then query the running-job for details such as name, configuration,
* progress etc.
*
* @see JobClient
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public interface RunningJob {
/**
* Get the underlying job configuration
*
* @return the configuration of the job.
*/
public Configuration getConfiguration();
/**
* Get the job identifier.
*
* @return the job identifier.
*/
public JobID getID();
/** @deprecated This method is deprecated and will be removed. Applications should
* rather use {@link #getID()}.
*/
@Deprecated
public String getJobID();
/**
* Get the name of the job.
*
* @return the name of the job.
*/
public String getJobName();
/**
* Get the path of the submitted job configuration.
*
* @return the path of the submitted job configuration.
*/
public String getJobFile();
/**
* Get the URL where some job progress information will be displayed.
*
* @return the URL where some job progress information will be displayed.
*/
public String getTrackingURL();
/**
* Get the progress of the job's map-tasks, as a float between 0.0
* and 1.0. When all map tasks have completed, the function returns 1.0.
*
* @return the progress of the job's map-tasks.
* @throws IOException
*/
public float mapProgress() throws IOException;
/**
* Get the progress of the job's reduce-tasks, as a float between 0.0
* and 1.0. When all reduce tasks have completed, the function returns 1.0.
*
* @return the progress of the job's reduce-tasks.
* @throws IOException
*/
public float reduceProgress() throws IOException;
/**
* Get the progress of the job's cleanup-tasks, as a float between 0.0
* and 1.0. When all cleanup tasks have completed, the function returns 1.0.
*
* @return the progress of the job's cleanup-tasks.
* @throws IOException
*/
public float cleanupProgress() throws IOException;
/**
* Get the progress of the job's setup-tasks, as a float between 0.0
* and 1.0. When all setup tasks have completed, the function returns 1.0.
*
* @return the progress of the job's setup-tasks.
* @throws IOException
*/
public float setupProgress() throws IOException;
/**
* Check if the job is finished or not.
* This is a non-blocking call.
*
* @return true if the job is complete, else false.
* @throws IOException
*/
public boolean isComplete() throws IOException;
/**
* Check if the job completed successfully.
*
* @return true if the job succeeded, else false.
* @throws IOException
*/
public boolean isSuccessful() throws IOException;
/**
* Blocks until the job is complete.
*
* @throws IOException
*/
public void waitForCompletion() throws IOException;
/**
* Returns the current state of the Job.
* {@link JobStatus}
*
* @throws IOException
*/
public int getJobState() throws IOException;
/**
* Returns a snapshot of the current status, {@link JobStatus}, of the Job.
* Need to call again for latest information.
*
* @throws IOException
*/
public JobStatus getJobStatus() throws IOException;
/**
* Kill the running job. Blocks until all job tasks have been killed as well.
* If the job is no longer running, it simply returns.
*
* @throws IOException
*/
public void killJob() throws IOException;
/**
* Set the priority of a running job.
* @param priority the new priority for the job.
* @throws IOException
*/
public void setJobPriority(String priority) throws IOException;
/**
* Get events indicating completion (success/failure) of component tasks.
*
* @param startFrom index to start fetching events from
* @return an array of {@link TaskCompletionEvent}s
* @throws IOException
*/
public TaskCompletionEvent[] getTaskCompletionEvents(int startFrom)
throws IOException;
/**
* Kill indicated task attempt.
*
* @param taskId the id of the task to be terminated.
* @param shouldFail if true the task is failed and added to failed tasks
* list, otherwise it is just killed, w/o affecting
* job failure status.
* @throws IOException
*/
public void killTask(TaskAttemptID taskId, boolean shouldFail) throws IOException;
/** @deprecated Applications should rather use {@link #killTask(TaskAttemptID, boolean)}*/
@Deprecated
public void killTask(String taskId, boolean shouldFail) throws IOException;
/**
* Gets the counters for this job.
*
* @return the counters for this job or null if the job has been retired.
* @throws IOException
*/
public Counters getCounters() throws IOException;
/**
* Gets the diagnostic messages for a given task attempt.
* @param taskid
* @return the list of diagnostic messages for the task
* @throws IOException
*/
public String[] getTaskDiagnostics(TaskAttemptID taskid) throws IOException;
/**
* Get the url where history file is archived. Returns empty string if
* history file is not available yet.
*
* @return the url where history file is archived
* @throws IOException
*/
public String getHistoryUrl() throws IOException;
/**
* Check whether the job has been removed from JobTracker memory and retired.
* On retire, the job history file is copied to a location known by
* {@link #getHistoryUrl()}
* @return true if the job retired, else false.
* @throws IOException
*/
public boolean isRetired() throws IOException;
/**
* Get failure info for the job.
* @return the failure info for the job.
* @throws IOException
*/
public String getFailureInfo() throws IOException;
}