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If you were logged in you would be able to see more operations.
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File Attachments:
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Issue Links:
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Blocker
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This issue blocks:
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MAPREDUCE-252 Create an InputFormat for reading lines of text as Java Strings
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Dependants
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Reference
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This issue is related to:
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MAPREDUCE-245
Job and JobControl classes should return interfaces rather than implementations
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| Hadoop Flags: |
Reviewed
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| Release Note: |
Replaced parameters with context obejcts in Mapper, Reducer, Partitioner, InputFormat, and OutputFormat classes.
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| Resolution Date: |
15/Dec/08 10:22 PM
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This is a big change, but it will future-proof our API's. To maintain backwards compatibility, I'd suggest that we move over to a new package name (org.apache.hadoop.mapreduce) and deprecate the old interfaces and package. Basically, it will replace:
package org.apache.hadoop.mapred;
public interface Mapper extends JobConfigurable, Closeable {
void map(WritableComparable key, Writable value, OutputCollector output, Reporter reporter) throws IOException;
}
with:
package org.apache.hadoop.mapreduce;
public interface Mapper extends Closable {
void map(MapContext context) throws IOException;
}
where MapContext has the methods like getKey(), getValue(), collect(Key, Value), progress(), etc.
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Description
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This is a big change, but it will future-proof our API's. To maintain backwards compatibility, I'd suggest that we move over to a new package name (org.apache.hadoop.mapreduce) and deprecate the old interfaces and package. Basically, it will replace:
package org.apache.hadoop.mapred;
public interface Mapper extends JobConfigurable, Closeable {
void map(WritableComparable key, Writable value, OutputCollector output, Reporter reporter) throws IOException;
}
with:
package org.apache.hadoop.mapreduce;
public interface Mapper extends Closable {
void map(MapContext context) throws IOException;
}
where MapContext has the methods like getKey(), getValue(), collect(Key, Value), progress(), etc. |
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Improvement
Closed
