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HADOOP-6842. "hadoop fs -text" does not give a useful text representation of MapWritable objects 

(cherry picked from commit cc17c83585)
This commit is contained in:
Robert (Bobby) Evans 2015-05-08 11:56:59 -05:00
parent d4d7d7bf22
commit eef8d70bb0
3 changed files with 18 additions and 1 deletions
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3
hadoop-common-project/hadoop-common/CHANGES.txt
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@ -19,6 +19,9 @@ Release 2.8.0 - UNRELEASED
IMPROVEMENTS
HADOOP-6842. "hadoop fs -text" does not give a useful text representation
of MapWritable objects (Akira Ajisaka via bobby)
HADOOP-11719. [Fsshell] Remove bin/hadoop reference from
GenericOptionsParser default help text.

5
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/MapWritable.java
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@ -189,4 +189,9 @@ public void readFields(DataInput in) throws IOException {
instance.put(key, value);
}
}
@Override
public String toString() {
return instance.toString();
}
}

11
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/io/TestMapWritable.java
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@ -148,5 +148,14 @@ public void testEquality() {
assertEquals(map1.hashCode(), map2.hashCode());
assertFalse(map1.hashCode() == map3.hashCode());
}
}
/** Verify text command outputs a useful representation for MapWritable. */
public void testToString() {
MapWritable map = new MapWritable();
final IntWritable key = new IntWritable(5);
final Text value = new Text("value");
map.put(key, value);
assertEquals("{5=value}", map.toString());
}
}