p2pMapReduce.mapreduceModule
Interface JobContext

All Superinterfaces:
MRJobConfig
All Known Subinterfaces:
MapContext<KEYIN,VALUEIN,KEYOUT,VALUEOUT>, ReduceContext<KEYIN,VALUEIN,KEYOUT,VALUEOUT>, TaskAttemptContext, TaskInputOutputContext<KEYIN,VALUEIN,KEYOUT,VALUEOUT>
All Known Implementing Classes:
Job, JobContextImpl, MapContextImpl, Mapper.Context, ReduceContextImpl, Reducer.Context, TaskAttemptContextImpl, TaskInputOutputContextImpl, WrappedMapper.Context, WrappedReducer.Context

public interface JobContext
extends MRJobConfig

A read-only view of the job that is provided to the tasks while they are running.


Field Summary
 
Fields inherited from interface p2pMapReduce.mapreduceModule.MRJobConfig
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, COMPLETED_MAPS_FOR_REDUCE_SLOWSTART, END_NOTIFICATION_RETRIE_INTERVAL, END_NOTIFICATION_RETRIES, END_NOTIFICATION_URL, GROUP_COMPARATOR_CLASS, HISTORY_LOCATION, ID, INPUT_FORMAT_CLASS_ATTR, INPUTSPLIT_CLASS_ATTR, INPUTSPLIT_SIZE, IO_SORT_FACTOR, IO_SORT_MB, JAR, JAR_UNPACK_PATTERN, JOB_ACL_MODIFY_JOB, JOB_ACL_VIEW_JOB, JOB_CANCEL_DELEGATION_TOKEN, JOB_DIR_ATTR, JOB_INPUT_DIR_ATTR, JOB_INPUTSPLIT_DIR_ATTR, JOB_JAR_DIR_ATTR, JOB_JOBTRACKER_ID, JOB_LOCAL_DIR, JOB_NAME, JOB_NAMENODES, JOB_OUTPUT_DIR_ATTR, JVM_NUMTASKS_TORUN, KEY_COMPARATOR, MAP_CLASS_ATTR, MAP_COMBINE_MIN_SPILLS, 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_MEMORY_PHYSICAL_MB, MAP_OUTPUT_COMPRESS, MAP_OUTPUT_COMPRESS_CODEC, MAP_OUTPUT_DIR_ATTR, MAP_OUTPUT_KEY_CLASS, MAP_OUTPUT_KEY_FIELD_SEPERATOR, MAP_OUTPUT_KEY_VALUE_SEPARATOR_ATTR, MAP_OUTPUT_VALUE_CLASS, MAP_SKIP_INCR_PROC_COUNT, MAP_SKIP_MAX_RECORDS, MAP_SORT_SPILL_PERCENT, MAP_SPECULATIVE, MAP_ULIMIT, MAX_TASK_FAILURES_PER_TRACKER, NUM_MAP_PROFILES, NUM_MAPS, NUM_REDUCE_PROFILES, NUM_REDUCES, 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_DEBUG_SCRIPT, REDUCE_ENV, REDUCE_FAILURES_MAXPERCENT, REDUCE_INPUT_BUFFER_PERCENT, REDUCE_INPUT_DIR_ATTR, REDUCE_JAVA_OPTS, REDUCE_LOG_LEVEL, REDUCE_MARKRESET_BUFFER_PERCENT, REDUCE_MARKRESET_BUFFER_SIZE, REDUCE_MAX_ATTEMPTS, REDUCE_MEMORY_MB, REDUCE_MEMORY_PHYSICAL_MB, REDUCE_MEMORY_TOTAL_BYTES, REDUCE_MEMTOMEM_ENABLED, REDUCE_MEMTOMEM_THRESHOLD, REDUCE_MERGE_INMEM_THRESHOLD, REDUCE_OUTPUT_DIR_ATTR, REDUCE_SKIP_INCR_PROC_COUNT, REDUCE_SKIP_MAXGROUPS, REDUCE_SPECULATIVE, REDUCE_ULIMIT, SETUP_CLEANUP_NEEDED, SHUFFLE_CONNECT_TIMEOUT, SHUFFLE_FETCH_FAILURES, SHUFFLE_INPUT_BUFFER_PERCENT, SHUFFLE_MERGE_EPRCENT, 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, TASK_ATTEMPT_ID, TASK_DEBUGOUT_LINES, TASK_ID, TASK_ISMAP, TASK_OUTPUT_DIR, TASK_PARTITION, TASK_PROFILE, TASK_PROFILE_PARAMS, TASK_TEMP_DIR, TASK_TIMEOUT, TASK_USERLOG_LIMIT, USER_LOG_RETAIN_HOURS, USER_NAME, WORKING_DIR
 
Method Summary
 java.lang.Class<? extends Reducer<?,?,?,?>> getCombinerClass()
          Get the combiner class for the job.
 Configuration getConfiguration()
          Return the configuration for the job.
 java.lang.Class<? extends InputFormat<?,?>> getInputFormatClass()
          Get the InputFormat class for the job.
 java.lang.String getJar()
          Get the pathname of the job's jar.
 JobID getJobID()
          Get the unique ID for the job.
 java.lang.String getJobName()
          Get the user-specified job name.
 boolean getJobSetupCleanupNeeded()
          Get whether job-setup and job-cleanup is needed for the job
 java.lang.Class<?> getMapOutputKeyClass()
          Get the key class for the map output data.
 java.lang.Class<?> getMapOutputValueClass()
          Get the value class for the map output data.
 java.lang.Class<? extends Mapper<?,?,?,?>> getMapperClass()
          Get the Mapper class for the job.
 int getMaxMapAttempts()
          Get the configured number of maximum attempts that will be made to run a map task, as specified by the mapred.map.max.attempts property.
 int getMaxReduceAttempts()
          Get the configured number of maximum attempts that will be made to run a reduce task, as specified by the mapred.reduce.max.attempts property.
 int getNumReduceTasks()
          Get configured the number of reduce tasks for this job.
 java.lang.Class<? extends OutputFormat<?,?>> getOutputFormatClass()
          Get the OutputFormat class for the job.
 java.lang.Class<?> getOutputKeyClass()
          Get the key class for the job output data.
 java.lang.Class<?> getOutputValueClass()
          Get the value class for job outputs.
 java.lang.Class<? extends Partitioner<?,?>> getPartitionerClass()
          Get the Partitioner class for the job.
 boolean getProfileEnabled()
          Get whether the task profiling is enabled.
 java.lang.String getProfileParams()
          Get the profiler configuration arguments.
 Configuration.IntegerRanges getProfileTaskRange(boolean isMap)
          Get the range of maps or reduces to profile.
 java.lang.Class<? extends Reducer<?,?,?,?>> getReducerClass()
          Get the Reducer class for the job.
 RawComparator<?> getSortComparator()
          Get the RawComparator comparator used to compare keys.
 java.lang.String getUser()
          Get the reported username for this job.
 Path getWorkingDirectory()
          Get the current working directory for the default file system.
 

Method Detail

getConfiguration

Configuration getConfiguration()
Return the configuration for the job.

Returns:
the shared configuration object

getJobID

JobID getJobID()
Get the unique ID for the job.

Returns:
the object with the job id

getNumReduceTasks

int getNumReduceTasks()
Get configured the number of reduce tasks for this job. Defaults to 1.

Returns:
the number of reduce tasks for this job.

getWorkingDirectory

Path getWorkingDirectory()
                         throws java.io.IOException
Get the current working directory for the default file system.

Returns:
the directory name.
Throws:
java.io.IOException

getInputFormatClass

java.lang.Class<? extends InputFormat<?,?>> getInputFormatClass()
                                                                throws java.lang.ClassNotFoundException
Get the InputFormat class for the job.

Returns:
the InputFormat class for the job.
Throws:
java.lang.ClassNotFoundException

getOutputFormatClass

java.lang.Class<? extends OutputFormat<?,?>> getOutputFormatClass()
                                                                  throws java.lang.ClassNotFoundException
Get the OutputFormat class for the job.

Returns:
the OutputFormat class for the job.
Throws:
java.lang.ClassNotFoundException

getMapOutputKeyClass

java.lang.Class<?> getMapOutputKeyClass()
Get the key class for the map output data. If it is not set, use the (final) output key class. This allows the map output key class to be different than the final output key class.

Returns:
the map output key class.

getMapOutputValueClass

java.lang.Class<?> getMapOutputValueClass()
Get the value class for the map output data. If it is not set, use the (final) output value class This allows the map output value class to be different than the final output value class.

Returns:
the map output value class.

getOutputKeyClass

java.lang.Class<?> getOutputKeyClass()
Get the key class for the job output data.

Returns:
the key class for the job output data.

getOutputValueClass

java.lang.Class<?> getOutputValueClass()
Get the value class for job outputs.

Returns:
the value class for job outputs.

getMapperClass

java.lang.Class<? extends Mapper<?,?,?,?>> getMapperClass()
                                                          throws java.lang.ClassNotFoundException
Get the Mapper class for the job.

Returns:
the Mapper class for the job.
Throws:
java.lang.ClassNotFoundException

getCombinerClass

java.lang.Class<? extends Reducer<?,?,?,?>> getCombinerClass()
                                                             throws java.lang.ClassNotFoundException
Get the combiner class for the job.

Returns:
the combiner class for the job.
Throws:
java.lang.ClassNotFoundException

getPartitionerClass

java.lang.Class<? extends Partitioner<?,?>> getPartitionerClass()
                                                                throws java.lang.ClassNotFoundException
Get the Partitioner class for the job.

Returns:
the Partitioner class for the job.
Throws:
java.lang.ClassNotFoundException

getReducerClass

java.lang.Class<? extends Reducer<?,?,?,?>> getReducerClass()
                                                            throws java.lang.ClassNotFoundException
Get the Reducer class for the job.

Returns:
the Reducer class for the job.
Throws:
java.lang.ClassNotFoundException

getMaxMapAttempts

int getMaxMapAttempts()
Get the configured number of maximum attempts that will be made to run a map task, as specified by the mapred.map.max.attempts property. If this property is not already set, the default is 4 attempts.

Returns:
the max number of attempts per map task.

getMaxReduceAttempts

int getMaxReduceAttempts()
Get the configured number of maximum attempts that will be made to run a reduce task, as specified by the mapred.reduce.max.attempts property. If this property is not already set, the default is 4 attempts.

Returns:
the max number of attempts per reduce task.

getUser

java.lang.String getUser()
Get the reported username for this job.

Returns:
the username

getJobName

java.lang.String getJobName()
Get the user-specified job name. This is only used to identify the job to the user.

Returns:
the job's name, defaulting to "".

getSortComparator

RawComparator<?> getSortComparator()
Get the RawComparator comparator used to compare keys.

Returns:
the RawComparator comparator used to compare keys.

getJar

java.lang.String getJar()
Get the pathname of the job's jar.

Returns:
the pathname

getJobSetupCleanupNeeded

boolean getJobSetupCleanupNeeded()
Get whether job-setup and job-cleanup is needed for the job

Returns:
boolean

getProfileEnabled

boolean getProfileEnabled()
Get whether the task profiling is enabled.

Returns:
true if some tasks will be profiled

getProfileParams

java.lang.String getProfileParams()
Get the profiler configuration arguments. The default value for this property is "-agentlib:hprof=cpu=samples,heap=sites,force=n,thread=y,verbose=n,file=%s"

Returns:
the parameters to pass to the task child to configure profiling

getProfileTaskRange

Configuration.IntegerRanges getProfileTaskRange(boolean isMap)
Get the range of maps or reduces to profile.

Parameters:
isMap - is the task a map?
Returns:
the task ranges