@InterfaceAudience.Public @InterfaceStability.Stable public interface OutputFormat<K,V>
OutputFormatdescribes the output-specification for a Map-Reduce job.
The Map-Reduce framework relies on the
OutputFormat of the
RecordWriterimplementation to be used to write out the output files of the job. Output files are stored in a
|Modifier and Type||Method and Description|
Check for validity of the output-specification for the job.
RecordWriter<K,V> getRecordWriter(FileSystem ignored, JobConf job, String name, Progressable progress) throws IOException
RecordWriterfor the given job.
job- configuration for the job whose output is being written.
name- the unique name for this part of the output.
progress- mechanism for reporting progress while writing to file.
RecordWriterto write the output for the job.
void checkOutputSpecs(FileSystem ignored, JobConf job) throws IOException
This is to validate the output specification for the job when it is a job is submitted. Typically checks that it does not already exist, throwing an exception when it already exists, so that output is not overwritten.Implementations which write to filesystems which support delegation tokens usually collect the tokens for the destination path(s) and attach them to the job configuration.
job- job configuration.
IOException- when output should not be attempted
Copyright © 2022 Apache Software Foundation. All rights reserved.