org.apache.hadoop.mapreduce
Class Job

java.lang.Object
  org.apache.hadoop.mapreduce.task.JobContextImpl
      org.apache.hadoop.mapreduce.Job

All Implemented Interfaces:

JobContext, org.apache.hadoop.mapreduce.MRJobConfig

@InterfaceAudience.Public
@InterfaceStability.Evolving
public class Job
extends org.apache.hadoop.mapreduce.task.JobContextImpl
implements JobContext

The job submitter's view of the Job.

It allows the user to configure the job, submit it, control its execution, and query the state. The set methods only work until the job is submitted, afterwards they will throw an IllegalStateException.

Normally the user creates the application, describes various facets of the job via Job and then submits the job and monitor its progress.

Here is an example on how to submit a job:

     // Create a new Job
     Job job = new Job(new Configuration());
     job.setJarByClass(MyJob.class);
     
     // Specify various job-specific parameters     
     job.setJobName("myjob");
     
     job.setInputPath(new Path("in"));
     job.setOutputPath(new Path("out"));
     
     job.setMapperClass(MyJob.MyMapper.class);
     job.setReducerClass(MyJob.MyReducer.class);

     // Submit the job, then poll for progress until the job is complete
     job.waitForCompletion(true);
 

Field Summary

static String	COMPLETION_POLL_INTERVAL_KEY Key in mapred-*.xml that sets completionPollInvervalMillis
static String	OUTPUT_FILTER
static String	PROGRESS_MONITOR_POLL_INTERVAL_KEY Key in mapred-*.xml that sets progMonitorPollIntervalMillis
static String	SUBMIT_REPLICATION
static String	USED_GENERIC_PARSER

Fields inherited from class org.apache.hadoop.mapreduce.task.JobContextImpl

conf, credentials, ugi

Fields inherited from interface org.apache.hadoop.mapreduce.MRJobConfig

APPLICATION_ATTEMPT_ID, APPLICATION_MASTER_CLASS, CACHE_ARCHIVES, CACHE_ARCHIVES_SIZES, CACHE_ARCHIVES_TIMESTAMPS, CACHE_ARCHIVES_VISIBILITIES, CACHE_FILE_TIMESTAMPS, CACHE_FILE_VISIBILITIES, CACHE_FILES, CACHE_FILES_SIZES, CACHE_LOCALARCHIVES, CACHE_LOCALFILES, CACHE_SYMLINK, CLASSPATH_ARCHIVES, CLASSPATH_FILES, COMBINE_CLASS_ATTR, COMBINE_RECORDS_BEFORE_PROGRESS, COMBINER_GROUP_COMPARATOR_CLASS, COMPLETED_MAPS_FOR_REDUCE_SLOWSTART, COUNTER_GROUP_NAME_MAX_DEFAULT, COUNTER_GROUP_NAME_MAX_KEY, COUNTER_GROUPS_MAX_DEFAULT, COUNTER_GROUPS_MAX_KEY, COUNTER_NAME_MAX_DEFAULT, COUNTER_NAME_MAX_KEY, COUNTERS_MAX_DEFAULT, COUNTERS_MAX_KEY, DEFAULT_JOB_ACL_MODIFY_JOB, DEFAULT_JOB_ACL_VIEW_JOB, DEFAULT_JOB_AM_ACCESS_DISABLED, DEFAULT_JOB_TOKEN_TRACKING_IDS_ENABLED, DEFAULT_LOG_LEVEL, DEFAULT_MAP_CPU_VCORES, DEFAULT_MAP_MEMORY_MB, DEFAULT_MAPRED_ADMIN_JAVA_OPTS, DEFAULT_MAPRED_ADMIN_USER_ENV, DEFAULT_MAPREDUCE_APPLICATION_CLASSPATH, DEFAULT_MAPREDUCE_CROSS_PLATFORM_APPLICATION_CLASSPATH, DEFAULT_MAX_SHUFFLE_FETCH_RETRY_DELAY, DEFAULT_MR_AM_ADMIN_COMMAND_OPTS, DEFAULT_MR_AM_COMMAND_OPTS, DEFAULT_MR_AM_COMMIT_WINDOW_MS, DEFAULT_MR_AM_COMMITTER_CANCEL_TIMEOUT_MS, DEFAULT_MR_AM_CONTAINERLAUNCHER_THREAD_COUNT_LIMIT, DEFAULT_MR_AM_CPU_VCORES, DEFAULT_MR_AM_HISTORY_COMPLETE_EVENT_FLUSH_TIMEOUT_MS, DEFAULT_MR_AM_HISTORY_JOB_COMPLETE_UNFLUSHED_MULTIPLIER, DEFAULT_MR_AM_HISTORY_MAX_UNFLUSHED_COMPLETE_EVENTS, DEFAULT_MR_AM_HISTORY_USE_BATCHED_FLUSH_QUEUE_SIZE_THRESHOLD, DEFAULT_MR_AM_IGNORE_BLACKLISTING_BLACKLISTED_NODE_PERCENT, DEFAULT_MR_AM_JOB_CLIENT_THREAD_COUNT, DEFAULT_MR_AM_JOB_REDUCE_PREEMPTION_LIMIT, DEFAULT_MR_AM_JOB_REDUCE_RAMP_UP_LIMIT, DEFAULT_MR_AM_LOG_BACKUPS, DEFAULT_MR_AM_LOG_KB, DEFAULT_MR_AM_LOG_LEVEL, DEFAULT_MR_AM_MAX_ATTEMPTS, DEFAULT_MR_AM_NUM_PROGRESS_SPLITS, DEFAULT_MR_AM_STAGING_DIR, DEFAULT_MR_AM_TASK_ESTIMATOR_SMOOTH_LAMBDA_MS, DEFAULT_MR_AM_TASK_LISTENER_THREAD_COUNT, DEFAULT_MR_AM_TO_RM_HEARTBEAT_INTERVAL_MS, DEFAULT_MR_AM_TO_RM_WAIT_INTERVAL_MS, DEFAULT_MR_AM_VMEM_MB, DEFAULT_MR_CLIENT_MAX_RETRIES, DEFAULT_MR_CLIENT_TO_AM_IPC_MAX_RETRIES, DEFAULT_MR_CLIENT_TO_AM_IPC_MAX_RETRIES_ON_TIMEOUTS, DEFAULT_MR_JOB_END_NOTIFICATION_TIMEOUT, DEFAULT_REDUCE_CPU_VCORES, DEFAULT_REDUCE_MEMORY_MB, DEFAULT_SHELL, DEFAULT_SPLIT_METAINFO_MAXSIZE, DEFAULT_TASK_LOG_BACKUPS, GROUP_COMPARATOR_CLASS, HADOOP_WORK_DIR, ID, INDEX_CACHE_MEMORY_LIMIT, INPUT_FORMAT_CLASS_ATTR, IO_SORT_FACTOR, IO_SORT_MB, JAR, JAR_UNPACK_PATTERN, JOB_ACL_MODIFY_JOB, JOB_ACL_VIEW_JOB, JOB_AM_ACCESS_DISABLED, JOB_CANCEL_DELEGATION_TOKEN, JOB_CONF_FILE, JOB_JAR, JOB_JOBTRACKER_ID, JOB_LOCAL_DIR, JOB_NAME, JOB_NAMENODES, JOB_SPLIT, JOB_SPLIT_METAINFO, JOB_SUBMIT_DIR, JOB_SUBMITHOST, JOB_SUBMITHOSTADDR, JOB_TAGS, JOB_TOKEN_TRACKING_IDS, JOB_TOKEN_TRACKING_IDS_ENABLED, JOB_UBERTASK_ENABLE, JOB_UBERTASK_MAXBYTES, JOB_UBERTASK_MAXMAPS, JOB_UBERTASK_MAXREDUCES, JVM_NUMTASKS_TORUN, KEY_COMPARATOR, MAP_CLASS_ATTR, MAP_COMBINE_MIN_SPILLS, MAP_CPU_VCORES, MAP_DEBUG_SCRIPT, MAP_ENV, MAP_FAILURES_MAX_PERCENT, MAP_INPUT_FILE, MAP_INPUT_PATH, MAP_INPUT_START, MAP_JAVA_OPTS, MAP_LOG_LEVEL, MAP_MAX_ATTEMPTS, MAP_MEMORY_MB, MAP_OUTPUT_COLLECTOR_CLASS_ATTR, MAP_OUTPUT_COMPRESS, MAP_OUTPUT_COMPRESS_CODEC, MAP_OUTPUT_KEY_CLASS, MAP_OUTPUT_KEY_FIELD_SEPERATOR, MAP_OUTPUT_VALUE_CLASS, MAP_SKIP_INCR_PROC_COUNT, MAP_SKIP_MAX_RECORDS, MAP_SORT_SPILL_PERCENT, MAP_SPECULATIVE, MAPRED_ADMIN_USER_ENV, MAPRED_ADMIN_USER_SHELL, MAPRED_MAP_ADMIN_JAVA_OPTS, MAPRED_REDUCE_ADMIN_JAVA_OPTS, MAPREDUCE_APPLICATION_CLASSPATH, MAPREDUCE_APPLICATION_FRAMEWORK_PATH, MAPREDUCE_JOB_CLASSLOADER, MAPREDUCE_JOB_CLASSLOADER_SYSTEM_CLASSES, MAPREDUCE_JOB_CREDENTIALS_BINARY, MAPREDUCE_JOB_DIR, MAPREDUCE_JOB_SHUFFLE_PROVIDER_SERVICES, MAPREDUCE_JOB_USER_CLASSPATH_FIRST, MAPREDUCE_V2_CHILD_CLASS, MAX_SHUFFLE_FETCH_RETRY_DELAY, MAX_TASK_FAILURES_PER_TRACKER, MR_AM_ADMIN_COMMAND_OPTS, MR_AM_ADMIN_USER_ENV, MR_AM_COMMAND_OPTS, MR_AM_COMMIT_WINDOW_MS, MR_AM_COMMITTER_CANCEL_TIMEOUT_MS, MR_AM_CONTAINERLAUNCHER_THREAD_COUNT_LIMIT, MR_AM_CPU_VCORES, MR_AM_CREATE_JH_INTERMEDIATE_BASE_DIR, MR_AM_ENV, MR_AM_HISTORY_COMPLETE_EVENT_FLUSH_TIMEOUT_MS, MR_AM_HISTORY_JOB_COMPLETE_UNFLUSHED_MULTIPLIER, MR_AM_HISTORY_MAX_UNFLUSHED_COMPLETE_EVENTS, MR_AM_HISTORY_USE_BATCHED_FLUSH_QUEUE_SIZE_THRESHOLD, MR_AM_IGNORE_BLACKLISTING_BLACKLISTED_NODE_PERECENT, MR_AM_JOB_CLIENT_PORT_RANGE, MR_AM_JOB_CLIENT_THREAD_COUNT, MR_AM_JOB_NODE_BLACKLISTING_ENABLE, MR_AM_JOB_RECOVERY_ENABLE, MR_AM_JOB_RECOVERY_ENABLE_DEFAULT, MR_AM_JOB_REDUCE_PREEMPTION_LIMIT, MR_AM_JOB_REDUCE_RAMPUP_UP_LIMIT, MR_AM_JOB_SPECULATOR, MR_AM_LOG_BACKUPS, MR_AM_LOG_KB, MR_AM_LOG_LEVEL, MR_AM_MAX_ATTEMPTS, MR_AM_NUM_PROGRESS_SPLITS, MR_AM_PREFIX, MR_AM_SECURITY_SERVICE_AUTHORIZATION_CLIENT, MR_AM_SECURITY_SERVICE_AUTHORIZATION_TASK_UMBILICAL, MR_AM_STAGING_DIR, MR_AM_TASK_ESTIMATOR, MR_AM_TASK_ESTIMATOR_EXPONENTIAL_RATE_ENABLE, MR_AM_TASK_ESTIMATOR_SMOOTH_LAMBDA_MS, MR_AM_TASK_LISTENER_THREAD_COUNT, MR_AM_TO_RM_HEARTBEAT_INTERVAL_MS, MR_AM_TO_RM_WAIT_INTERVAL_MS, MR_AM_VMEM_MB, MR_APPLICATION_TYPE, MR_CLIENT_MAX_RETRIES, MR_CLIENT_TO_AM_IPC_MAX_RETRIES, MR_CLIENT_TO_AM_IPC_MAX_RETRIES_ON_TIMEOUTS, MR_JOB_END_NOTIFICATION_MAX_ATTEMPTS, MR_JOB_END_NOTIFICATION_MAX_RETRY_INTERVAL, MR_JOB_END_NOTIFICATION_PROXY, MR_JOB_END_NOTIFICATION_TIMEOUT, MR_JOB_END_NOTIFICATION_URL, MR_JOB_END_RETRY_ATTEMPTS, MR_JOB_END_RETRY_INTERVAL, MR_PREFIX, NUM_MAP_PROFILES, NUM_MAPS, NUM_REDUCE_PROFILES, NUM_REDUCES, OUTPUT, OUTPUT_FORMAT_CLASS_ATTR, OUTPUT_KEY_CLASS, OUTPUT_VALUE_CLASS, PARTITIONER_CLASS_ATTR, PRESERVE_FAILED_TASK_FILES, PRESERVE_FILES_PATTERN, PRIORITY, QUEUE_NAME, RECORDS_BEFORE_PROGRESS, REDUCE_CLASS_ATTR, REDUCE_CPU_VCORES, REDUCE_DEBUG_SCRIPT, REDUCE_ENV, REDUCE_FAILURES_MAXPERCENT, REDUCE_INPUT_BUFFER_PERCENT, REDUCE_JAVA_OPTS, REDUCE_LOG_LEVEL, REDUCE_MARKRESET_BUFFER_PERCENT, REDUCE_MARKRESET_BUFFER_SIZE, REDUCE_MAX_ATTEMPTS, REDUCE_MEMORY_MB, REDUCE_MEMORY_TOTAL_BYTES, REDUCE_MEMTOMEM_ENABLED, REDUCE_MEMTOMEM_THRESHOLD, REDUCE_MERGE_INMEM_THRESHOLD, REDUCE_SKIP_INCR_PROC_COUNT, REDUCE_SKIP_MAXGROUPS, REDUCE_SPECULATIVE, SETUP_CLEANUP_NEEDED, SHUFFLE_CONNECT_TIMEOUT, SHUFFLE_FETCH_FAILURES, SHUFFLE_INPUT_BUFFER_PERCENT, SHUFFLE_MEMORY_LIMIT_PERCENT, SHUFFLE_MERGE_PERCENT, SHUFFLE_NOTIFY_READERROR, SHUFFLE_PARALLEL_COPIES, SHUFFLE_READ_TIMEOUT, SKIP_OUTDIR, SKIP_RECORDS, SKIP_START_ATTEMPTS, SPECULATIVE_SLOWNODE_THRESHOLD, SPECULATIVE_SLOWTASK_THRESHOLD, SPECULATIVECAP, SPLIT_FILE, SPLIT_METAINFO_MAXSIZE, STDERR_LOGFILE_ENV, STDOUT_LOGFILE_ENV, TASK_ATTEMPT_ID, TASK_CLEANUP_NEEDED, TASK_DEBUGOUT_LINES, TASK_ID, TASK_ISMAP, TASK_LOG_BACKUPS, TASK_MAP_PROFILE_PARAMS, TASK_OUTPUT_DIR, TASK_PARTITION, TASK_PROFILE, TASK_PROFILE_PARAMS, TASK_REDUCE_PROFILE_PARAMS, TASK_TEMP_DIR, TASK_TIMEOUT, TASK_TIMEOUT_CHECK_INTERVAL_MS, TASK_USERLOG_LIMIT, USER_LOG_RETAIN_HOURS, USER_NAME, WORKDIR, WORKFLOW_ADJACENCY_PREFIX_PATTERN, WORKFLOW_ADJACENCY_PREFIX_STRING, WORKFLOW_ID, WORKFLOW_NAME, WORKFLOW_NODE_NAME, WORKFLOW_TAGS, WORKING_DIR

Constructor Summary

Job()
Deprecated.

Job(Configuration conf)
Deprecated.

Job(Configuration conf, String jobName)
Deprecated.

Method Summary

void	addArchiveToClassPath(Path archive) Add an archive path to the current set of classpath entries.
void	addCacheArchive(URI uri) Add a archives to be localized
void	addCacheFile(URI uri) Add a file to be localized
void	addFileToClassPath(Path file) Add an file path to the current set of classpath entries It adds the file to cache as well.
float	cleanupProgress() Get the progress of the job's cleanup-tasks, as a float between 0.0 and 1.0.
void	createSymlink() Deprecated.
void	failTask(TaskAttemptID taskId) Fail indicated task attempt.
static int	getCompletionPollInterval(Configuration conf) The interval at which waitForCompletion() should check.
Counters	getCounters() Gets the counters for this job.
long	getFinishTime() Get finish time of the job.
String	getHistoryUrl()
static Job	getInstance() Creates a new Job with no particular Cluster .
static Job	getInstance(Cluster ignored) Deprecated. Use getInstance()
static Job	getInstance(Cluster ignored, Configuration conf) Deprecated. Use getInstance(Configuration)
static Job	getInstance(Configuration conf) Creates a new Job with no particular Cluster and a given Configuration.
static Job	getInstance(Configuration conf, String jobName) Creates a new Job with no particular Cluster and a given jobName.
static Job	getInstance(JobStatus status, Configuration conf) Creates a new Job with no particular Cluster and given Configuration and JobStatus.
String	getJobFile() Get the path of the submitted job configuration.
String	getJobName() The user-specified job name.
org.apache.hadoop.mapreduce.JobStatus.State	getJobState() Returns the current state of the Job.
JobPriority	getPriority() Get scheduling info of the job.
static int	getProgressPollInterval(Configuration conf) The interval at which monitorAndPrintJob() prints status
String	getSchedulingInfo() Get scheduling info of the job.
long	getStartTime() Get start time of the job.
JobStatus	getStatus()
TaskCompletionEvent[]	getTaskCompletionEvents(int startFrom) Get events indicating completion (success/failure) of component tasks.
TaskCompletionEvent[]	getTaskCompletionEvents(int startFrom, int numEvents) Get events indicating completion (success/failure) of component tasks.
String[]	getTaskDiagnostics(TaskAttemptID taskid) Gets the diagnostic messages for a given task attempt.
static org.apache.hadoop.mapreduce.Job.TaskStatusFilter	getTaskOutputFilter(Configuration conf) Get the task output filter.
org.apache.hadoop.mapreduce.TaskReport[]	getTaskReports(TaskType type) Get the information of the current state of the tasks of a job.
String	getTrackingURL() Get the URL where some job progress information will be displayed.
boolean	isComplete() Check if the job is finished or not.
boolean	isRetired()
boolean	isSuccessful() Check if the job completed successfully.
boolean	isUber()
void	killJob() Kill the running job.
void	killTask(TaskAttemptID taskId) Kill indicated task attempt.
float	mapProgress() Get the progress of the job's map-tasks, as a float between 0.0 and 1.0.
boolean	monitorAndPrintJob() Monitor a job and print status in real-time as progress is made and tasks fail.
float	reduceProgress() Get the progress of the job's reduce-tasks, as a float between 0.0 and 1.0.
void	setCacheArchives(URI[] archives) Set the given set of archives
void	setCacheFiles(URI[] files) Set the given set of files
void	setCancelDelegationTokenUponJobCompletion(boolean value) Sets the flag that will allow the JobTracker to cancel the HDFS delegation tokens upon job completion.
void	setCombinerClass(Class<? extends Reducer> cls) Set the combiner class for the job.
void	setCombinerKeyGroupingComparatorClass(Class<? extends RawComparator> cls) Define the comparator that controls which keys are grouped together for a single call to combiner, Reducer.reduce(Object, Iterable, org.apache.hadoop.mapreduce.Reducer.Context)
void	setGroupingComparatorClass(Class<? extends RawComparator> cls) Define the comparator that controls which keys are grouped together for a single call to Reducer.reduce(Object, Iterable, org.apache.hadoop.mapreduce.Reducer.Context)
void	setInputFormatClass(Class<? extends InputFormat> cls) Set the InputFormat for the job.
void	setJar(String jar) Set the job jar
void	setJarByClass(Class<?> cls) Set the Jar by finding where a given class came from.
void	setJobName(String name) Set the user-specified job name.
void	setJobSetupCleanupNeeded(boolean needed) Specify whether job-setup and job-cleanup is needed for the job
void	setMapOutputKeyClass(Class<?> theClass) Set the key class for the map output data.
void	setMapOutputValueClass(Class<?> theClass) Set the value class for the map output data.
void	setMapperClass(Class<? extends Mapper> cls) Set the Mapper for the job.
void	setMapSpeculativeExecution(boolean speculativeExecution) Turn speculative execution on or off for this job for map tasks.
void	setMaxMapAttempts(int n) Expert: Set the number of maximum attempts that will be made to run a map task.
void	setMaxReduceAttempts(int n) Expert: Set the number of maximum attempts that will be made to run a reduce task.
void	setNumReduceTasks(int tasks) Set the number of reduce tasks for the job.
void	setOutputFormatClass(Class<? extends OutputFormat> cls) Set the OutputFormat for the job.
void	setOutputKeyClass(Class<?> theClass) Set the key class for the job output data.
void	setOutputValueClass(Class<?> theClass) Set the value class for job outputs.
void	setPartitionerClass(Class<? extends Partitioner> cls) Set the Partitioner for the job.
void	setPriority(JobPriority priority) Set the priority of a running job.
void	setProfileEnabled(boolean newValue) Set whether the system should collect profiler information for some of the tasks in this job? The information is stored in the user log directory.
void	setProfileParams(String value) Set the profiler configuration arguments.
void	setProfileTaskRange(boolean isMap, String newValue) Set the ranges of maps or reduces to profile.
void	setReducerClass(Class<? extends Reducer> cls) Set the Reducer for the job.
void	setReduceSpeculativeExecution(boolean speculativeExecution) Turn speculative execution on or off for this job for reduce tasks.
void	setSortComparatorClass(Class<? extends RawComparator> cls) Define the comparator that controls how the keys are sorted before they are passed to the Reducer.
void	setSpeculativeExecution(boolean speculativeExecution) Turn speculative execution on or off for this job.
static void	setTaskOutputFilter(Configuration conf, org.apache.hadoop.mapreduce.Job.TaskStatusFilter newValue) Modify the Configuration to set the task output filter.
float	setupProgress() Get the progress of the job's setup-tasks, as a float between 0.0 and 1.0.
void	setUser(String user) Set the reported username for this job.
void	setWorkingDirectory(Path dir) Set the current working directory for the default file system.
void	submit() Submit the job to the cluster and return immediately.
String	toString() Dump stats to screen.
boolean	waitForCompletion(boolean verbose) Submit the job to the cluster and wait for it to finish.

Methods inherited from class org.apache.hadoop.mapreduce.task.JobContextImpl

getArchiveClassPaths, getArchiveTimestamps, getCacheArchives, getCacheFiles, getCombinerClass, getCombinerKeyGroupingComparator, getConfiguration, getCredentials, getFileClassPaths, getFileTimestamps, getGroupingComparator, getInputFormatClass, getJar, getJobID, getJobSetupCleanupNeeded, getLocalCacheArchives, getLocalCacheFiles, getMapOutputKeyClass, getMapOutputValueClass, getMapperClass, getMaxMapAttempts, getMaxReduceAttempts, getNumReduceTasks, getOutputFormatClass, getOutputKeyClass, getOutputValueClass, getPartitionerClass, getProfileEnabled, getProfileParams, getProfileTaskRange, getReducerClass, getSortComparator, getSymlink, getTaskCleanupNeeded, getUser, getWorkingDirectory, setJobID

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.hadoop.mapreduce.JobContext

getArchiveClassPaths, getArchiveTimestamps, getCacheArchives, getCacheFiles, getCombinerClass, getCombinerKeyGroupingComparator, getConfiguration, getCredentials, getFileClassPaths, getFileTimestamps, getGroupingComparator, getInputFormatClass, getJar, getJobID, getJobSetupCleanupNeeded, getLocalCacheArchives, getLocalCacheFiles, getMapOutputKeyClass, getMapOutputValueClass, getMapperClass, getMaxMapAttempts, getMaxReduceAttempts, getNumReduceTasks, getOutputFormatClass, getOutputKeyClass, getOutputValueClass, getPartitionerClass, getProfileEnabled, getProfileParams, getProfileTaskRange, getReducerClass, getSortComparator, getSymlink, getTaskCleanupNeeded, getUser, getWorkingDirectory

Field Detail

OUTPUT_FILTER

public static final String OUTPUT_FILTER

See Also:

Constant Field Values

COMPLETION_POLL_INTERVAL_KEY

public static final String COMPLETION_POLL_INTERVAL_KEY

Key in mapred-*.xml that sets completionPollInvervalMillis

See Also:

Constant Field Values

PROGRESS_MONITOR_POLL_INTERVAL_KEY

public static final String PROGRESS_MONITOR_POLL_INTERVAL_KEY

Key in mapred-*.xml that sets progMonitorPollIntervalMillis

See Also:

Constant Field Values

USED_GENERIC_PARSER

public static final String USED_GENERIC_PARSER

See Also:

Constant Field Values

SUBMIT_REPLICATION

public static final String SUBMIT_REPLICATION

See Also:

Constant Field Values

Constructor Detail

Job

@Deprecated
public Job()
    throws IOException

Deprecated.

Throws:

IOException

Job

@Deprecated
public Job(Configuration conf)
    throws IOException

Deprecated.

Throws:

IOException

Job

@Deprecated
public Job(Configuration conf,
                      String jobName)
    throws IOException

Deprecated.

Throws:

IOException

Method Detail

getInstance

public static Job getInstance()
                       throws IOException

Creates a new Job with no particular Cluster . A Cluster will be created with a generic Configuration.

Returns:

the Job , with no connection to a cluster yet.

Throws:

IOException

getInstance

public static Job getInstance(Configuration conf)
                       throws IOException

Creates a new Job with no particular Cluster and a given Configuration. The Job makes a copy of the Configuration so that any necessary internal modifications do not reflect on the incoming parameter. A Cluster will be created from the conf parameter only when it's needed.

Parameters:

conf - the configuration

Returns:

the Job , with no connection to a cluster yet.

Throws:

IOException

getInstance

public static Job getInstance(Configuration conf,
                              String jobName)
                       throws IOException

Creates a new Job with no particular Cluster and a given jobName. A Cluster will be created from the conf parameter only when it's needed. The Job makes a copy of the Configuration so that any necessary internal modifications do not reflect on the incoming parameter.

Parameters:

conf - the configuration

Returns:

the Job , with no connection to a cluster yet.

Throws:

IOException

getInstance

public static Job getInstance(JobStatus status,
                              Configuration conf)
                       throws IOException

Creates a new Job with no particular Cluster and given Configuration and JobStatus. A Cluster will be created from the conf parameter only when it's needed. The Job makes a copy of the Configuration so that any necessary internal modifications do not reflect on the incoming parameter.

Parameters:

status - job status

conf - job configuration

Returns:

the Job , with no connection to a cluster yet.

Throws:

IOException

getInstance

@Deprecated
public static Job getInstance(Cluster ignored)
                       throws IOException

Deprecated. Use getInstance()

Creates a new Job with no particular Cluster. A Cluster will be created from the conf parameter only when it's needed. The Job makes a copy of the Configuration so that any necessary internal modifications do not reflect on the incoming parameter.

Parameters:

ignored -

Returns:

the Job , with no connection to a cluster yet.

Throws:

IOException

getInstance

@Deprecated
public static Job getInstance(Cluster ignored,
                                         Configuration conf)
                       throws IOException

Deprecated. Use getInstance(Configuration)

Creates a new Job with no particular Cluster and given Configuration. A Cluster will be created from the conf parameter only when it's needed. The Job makes a copy of the Configuration so that any necessary internal modifications do not reflect on the incoming parameter.

Parameters:

ignored -

conf - job configuration

Returns:

the Job , with no connection to a cluster yet.

Throws:

IOException

getStatus

public JobStatus getStatus()
                    throws IOException,
                           InterruptedException

Throws:

IOException

InterruptedException

getJobState

public org.apache.hadoop.mapreduce.JobStatus.State getJobState()
                                                        throws IOException,
                                                               InterruptedException

Returns the current state of the Job.

Returns:

JobStatus#State

Throws:

IOException

InterruptedException

getTrackingURL

public String getTrackingURL()

Get the URL where some job progress information will be displayed.

Returns:

the URL where some job progress information will be displayed.

getJobFile

public String getJobFile()

Get the path of the submitted job configuration.

Returns:

the path of the submitted job configuration.

getStartTime

public long getStartTime()

Get start time of the job.

Returns:

the start time of the job

getFinishTime

public long getFinishTime()
                   throws IOException,
                          InterruptedException

Get finish time of the job.

Returns:

the finish time of the job

Throws:

IOException

InterruptedException

getSchedulingInfo

public String getSchedulingInfo()

Get scheduling info of the job.

Returns:

the scheduling info of the job

getPriority

public JobPriority getPriority()
                        throws IOException,
                               InterruptedException

Get scheduling info of the job.

Returns:

the scheduling info of the job

Throws:

IOException

InterruptedException

getJobName

public String getJobName()

The user-specified job name.

Specified by:

getJobName in interface JobContext

Overrides:

getJobName in class org.apache.hadoop.mapreduce.task.JobContextImpl

Returns:

the job's name, defaulting to "".

getHistoryUrl

public String getHistoryUrl()
                     throws IOException,
                            InterruptedException

Throws:

IOException

InterruptedException

isRetired

public boolean isRetired()
                  throws IOException,
                         InterruptedException

Throws:

IOException

InterruptedException

toString

public String toString()

Dump stats to screen.

Overrides:

toString in class Object

getTaskReports

public org.apache.hadoop.mapreduce.TaskReport[] getTaskReports(TaskType type)
                                                        throws IOException,
                                                               InterruptedException

Get the information of the current state of the tasks of a job.

Parameters:

type - Type of the task

Returns:

the list of all of the map tips.

Throws:

IOException

InterruptedException

mapProgress

public float mapProgress()
                  throws IOException

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.

Returns:

the progress of the job's map-tasks.

Throws:

IOException

reduceProgress

public float reduceProgress()
                     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.

Returns:

the progress of the job's reduce-tasks.

Throws:

IOException

cleanupProgress

public float cleanupProgress()
                      throws IOException,
                             InterruptedException

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.

Returns:

the progress of the job's cleanup-tasks.

Throws:

IOException

InterruptedException

setupProgress

public float setupProgress()
                    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.

Returns:

the progress of the job's setup-tasks.

Throws:

IOException

isComplete

public boolean isComplete()
                   throws IOException

Check if the job is finished or not. This is a non-blocking call.

Returns:

true if the job is complete, else false.

Throws:

IOException

isSuccessful

public boolean isSuccessful()
                     throws IOException

Check if the job completed successfully.

Returns:

true if the job succeeded, else false.

Throws:

IOException

killJob

public void killJob()
             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

setPriority

public void setPriority(JobPriority priority)
                 throws IOException,
                        InterruptedException

Set the priority of a running job.

Parameters:

priority - the new priority for the job.

Throws:

IOException

InterruptedException

getTaskCompletionEvents

public TaskCompletionEvent[] getTaskCompletionEvents(int startFrom,
                                                     int numEvents)
                                              throws IOException,
                                                     InterruptedException

Get events indicating completion (success/failure) of component tasks.

Parameters:

startFrom - index to start fetching events from

numEvents - number of events to fetch

Returns:

an array of TaskCompletionEvents

Throws:

IOException

InterruptedException

getTaskCompletionEvents

public TaskCompletionEvent[] getTaskCompletionEvents(int startFrom)
                                              throws IOException

Get events indicating completion (success/failure) of component tasks.

Parameters:

startFrom - index to start fetching events from

Returns:

an array of TaskCompletionEvents

Throws:

IOException

killTask

public void killTask(TaskAttemptID taskId)
              throws IOException

Kill indicated task attempt.

Parameters:

taskId - the id of the task to be terminated.

Throws:

IOException

failTask

public void failTask(TaskAttemptID taskId)
              throws IOException

Fail indicated task attempt.

Parameters:

taskId - the id of the task to be terminated.

Throws:

IOException

getCounters

public Counters getCounters()
                     throws IOException

Gets the counters for this job. May return null if the job has been retired and the job is no longer in the completed job store.

Returns:

the counters for this job.

Throws:

IOException

getTaskDiagnostics

public String[] getTaskDiagnostics(TaskAttemptID taskid)
                            throws IOException,
                                   InterruptedException

Gets the diagnostic messages for a given task attempt.

Parameters:

taskid -

Returns:

the list of diagnostic messages for the task

Throws:

IOException

InterruptedException

setNumReduceTasks

public void setNumReduceTasks(int tasks)
                       throws IllegalStateException

Set the number of reduce tasks for the job.

Parameters:

tasks - the number of reduce tasks

Throws:

IllegalStateException - if the job is submitted

setWorkingDirectory

public void setWorkingDirectory(Path dir)
                         throws IOException

Set the current working directory for the default file system.

Parameters:

dir - the new current working directory.

Throws:

IllegalStateException - if the job is submitted

IOException

setInputFormatClass

public void setInputFormatClass(Class<? extends InputFormat> cls)
                         throws IllegalStateException

Set the InputFormat for the job.

Parameters:

cls - the InputFormat to use

Throws:

IllegalStateException - if the job is submitted

setOutputFormatClass

public void setOutputFormatClass(Class<? extends OutputFormat> cls)
                          throws IllegalStateException

Set the OutputFormat for the job.

Parameters:

cls - the OutputFormat to use

Throws:

IllegalStateException - if the job is submitted

setMapperClass

public void setMapperClass(Class<? extends Mapper> cls)
                    throws IllegalStateException

Set the Mapper for the job.

Parameters:

cls - the Mapper to use

Throws:

IllegalStateException - if the job is submitted

setJarByClass

public void setJarByClass(Class<?> cls)

Set the Jar by finding where a given class came from.

Parameters:

cls - the example class

setJar

public void setJar(String jar)

Set the job jar

setUser

public void setUser(String user)

Set the reported username for this job.

Parameters:

user - the username for this job.

setCombinerClass

public void setCombinerClass(Class<? extends Reducer> cls)
                      throws IllegalStateException

Set the combiner class for the job.

Parameters:

cls - the combiner to use

Throws:

IllegalStateException - if the job is submitted

setReducerClass

public void setReducerClass(Class<? extends Reducer> cls)
                     throws IllegalStateException

Set the Reducer for the job.

Parameters:

cls - the Reducer to use

Throws:

IllegalStateException - if the job is submitted

setPartitionerClass

public void setPartitionerClass(Class<? extends Partitioner> cls)
                         throws IllegalStateException

Set the Partitioner for the job.

Parameters:

cls - the Partitioner to use

Throws:

IllegalStateException - if the job is submitted

setMapOutputKeyClass

public void setMapOutputKeyClass(Class<?> theClass)
                          throws IllegalStateException

Set the key class for the map output data. This allows the user to specify the map output key class to be different than the final output value class.

Parameters:

theClass - the map output key class.

Throws:

IllegalStateException - if the job is submitted

setMapOutputValueClass

public void setMapOutputValueClass(Class<?> theClass)
                            throws IllegalStateException

Set the value class for the map output data. This allows the user to specify the map output value class to be different than the final output value class.

Parameters:

theClass - the map output value class.

Throws:

IllegalStateException - if the job is submitted

setOutputKeyClass

public void setOutputKeyClass(Class<?> theClass)
                       throws IllegalStateException

Set the key class for the job output data.

Parameters:

theClass - the key class for the job output data.

Throws:

IllegalStateException - if the job is submitted

setOutputValueClass

public void setOutputValueClass(Class<?> theClass)
                         throws IllegalStateException

Set the value class for job outputs.

Parameters:

theClass - the value class for job outputs.

Throws:

IllegalStateException - if the job is submitted

setCombinerKeyGroupingComparatorClass

public void setCombinerKeyGroupingComparatorClass(Class<? extends RawComparator> cls)
                                           throws IllegalStateException

Define the comparator that controls which keys are grouped together for a single call to combiner, Reducer.reduce(Object, Iterable, org.apache.hadoop.mapreduce.Reducer.Context)

Parameters:

cls - the raw comparator to use

Throws:

IllegalStateException - if the job is submitted

setSortComparatorClass

public void setSortComparatorClass(Class<? extends RawComparator> cls)
                            throws IllegalStateException

Define the comparator that controls how the keys are sorted before they are passed to the Reducer.

Parameters:

cls - the raw comparator

Throws:

IllegalStateException - if the job is submitted

See Also:

setCombinerKeyGroupingComparatorClass(Class)

setGroupingComparatorClass

public void setGroupingComparatorClass(Class<? extends RawComparator> cls)
                                throws IllegalStateException

Define the comparator that controls which keys are grouped together for a single call to Reducer.reduce(Object, Iterable, org.apache.hadoop.mapreduce.Reducer.Context)

Parameters:

cls - the raw comparator to use

Throws:

IllegalStateException - if the job is submitted

See Also:

setCombinerKeyGroupingComparatorClass(Class)

setJobName

public void setJobName(String name)
                throws IllegalStateException

Set the user-specified job name.

Parameters:

name - the job's new name.

Throws:

IllegalStateException - if the job is submitted

setSpeculativeExecution

public void setSpeculativeExecution(boolean speculativeExecution)

Turn speculative execution on or off for this job.

Parameters:

speculativeExecution - true if speculative execution should be turned on, else false.

setMapSpeculativeExecution

public void setMapSpeculativeExecution(boolean speculativeExecution)

Turn speculative execution on or off for this job for map tasks.

Parameters:

speculativeExecution - true if speculative execution should be turned on for map tasks, else false.

setReduceSpeculativeExecution

public void setReduceSpeculativeExecution(boolean speculativeExecution)

Turn speculative execution on or off for this job for reduce tasks.

Parameters:

speculativeExecution - true if speculative execution should be turned on for reduce tasks, else false.

setJobSetupCleanupNeeded

public void setJobSetupCleanupNeeded(boolean needed)

Specify whether job-setup and job-cleanup is needed for the job

Parameters:

needed - If true, job-setup and job-cleanup will be considered from OutputCommitter else ignored.

setCacheArchives

public void setCacheArchives(URI[] archives)

Set the given set of archives

Parameters:

archives - The list of archives that need to be localized

setCacheFiles

public void setCacheFiles(URI[] files)

Set the given set of files

Parameters:

files - The list of files that need to be localized

addCacheArchive

public void addCacheArchive(URI uri)

Add a archives to be localized

Parameters:

uri - The uri of the cache to be localized

addCacheFile

public void addCacheFile(URI uri)

Add a file to be localized

Parameters:

uri - The uri of the cache to be localized

addFileToClassPath

public void addFileToClassPath(Path file)
                        throws IOException

Add an file path to the current set of classpath entries It adds the file to cache as well. Files added with this method will not be unpacked while being added to the classpath. To add archives to classpath, use the addArchiveToClassPath(Path) method instead.

Parameters:

file - Path of the file to be added

Throws:

IOException

addArchiveToClassPath

public void addArchiveToClassPath(Path archive)
                           throws IOException

Add an archive path to the current set of classpath entries. It adds the archive to cache as well. Archive files will be unpacked and added to the classpath when being distributed.

Parameters:

archive - Path of the archive to be added

Throws:

IOException

createSymlink

@Deprecated
public void createSymlink()

Deprecated.

Originally intended to enable symlinks, but currently symlinks cannot be disabled.

setMaxMapAttempts

public void setMaxMapAttempts(int n)

Expert: Set the number of maximum attempts that will be made to run a map task.

Parameters:

n - the number of attempts per map task.

setMaxReduceAttempts

public void setMaxReduceAttempts(int n)

Expert: Set the number of maximum attempts that will be made to run a reduce task.

Parameters:

n - the number of attempts per reduce task.

setProfileEnabled

public void setProfileEnabled(boolean newValue)

Set whether the system should collect profiler information for some of the tasks in this job? The information is stored in the user log directory.

Parameters:

newValue - true means it should be gathered

setProfileParams

public void setProfileParams(String value)

Set the profiler configuration arguments. If the string contains a '%s' it will be replaced with the name of the profiling output file when the task runs. This value is passed to the task child JVM on the command line.

Parameters:

value - the configuration string

setProfileTaskRange

public void setProfileTaskRange(boolean isMap,
                                String newValue)

Set the ranges of maps or reduces to profile. setProfileEnabled(true) must also be called.

Parameters:

newValue - a set of integer ranges of the map ids

setCancelDelegationTokenUponJobCompletion

public void setCancelDelegationTokenUponJobCompletion(boolean value)

Sets the flag that will allow the JobTracker to cancel the HDFS delegation tokens upon job completion. Defaults to true.

submit

public void submit()
            throws IOException,
                   InterruptedException,
                   ClassNotFoundException

Submit the job to the cluster and return immediately.

Throws:

IOException

InterruptedException

ClassNotFoundException

waitForCompletion

public boolean waitForCompletion(boolean verbose)
                          throws IOException,
                                 InterruptedException,
                                 ClassNotFoundException

Submit the job to the cluster and wait for it to finish.

Parameters:

verbose - print the progress to the user

Returns:

true if the job succeeded

Throws:

IOException - thrown if the communication with the JobTracker is lost

InterruptedException

ClassNotFoundException

monitorAndPrintJob

public boolean monitorAndPrintJob()
                           throws IOException,
                                  InterruptedException

Monitor a job and print status in real-time as progress is made and tasks fail.

Returns:

true if the job succeeded

Throws:

IOException - if communication to the JobTracker fails

InterruptedException

getProgressPollInterval

public static int getProgressPollInterval(Configuration conf)

The interval at which monitorAndPrintJob() prints status

getCompletionPollInterval

public static int getCompletionPollInterval(Configuration conf)

The interval at which waitForCompletion() should check.

getTaskOutputFilter

public static org.apache.hadoop.mapreduce.Job.TaskStatusFilter getTaskOutputFilter(Configuration conf)

Get the task output filter.

Parameters:

conf - the configuration.

Returns:

the filter level.

setTaskOutputFilter

public static void setTaskOutputFilter(Configuration conf,
                                       org.apache.hadoop.mapreduce.Job.TaskStatusFilter newValue)

Modify the Configuration to set the task output filter.

Parameters:

conf - the Configuration to modify.

newValue - the value to set.

isUber

public boolean isUber()
               throws IOException,
                      InterruptedException

Throws:

IOException

InterruptedException