MAPREDUCE-1242. Chain APIs error misleading. Contributed by Harsh J Chouraria.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/mapreduce/trunk@1077761 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/CHANGES.txt b/CHANGES.txt
index eec3971..9ab598d 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -100,6 +100,9 @@
MAPREDUCE-2074. Task should fail when symlink creation fails.
(Priyo Mustafi via tomwhite)
+ MAPREDUCE-1242. Chain APIs error misleading.
+ (Harsh J Chouraria via tomwhite)
+
Release 0.22.0 - Unreleased
INCOMPATIBLE CHANGES
diff --git a/src/java/org/apache/hadoop/mapreduce/lib/chain/Chain.java b/src/java/org/apache/hadoop/mapreduce/lib/chain/Chain.java
index 3441b7c..384524a 100644
--- a/src/java/org/apache/hadoop/mapreduce/lib/chain/Chain.java
+++ b/src/java/org/apache/hadoop/mapreduce/lib/chain/Chain.java
@@ -692,13 +692,13 @@
+ CHAIN_MAPPER_CONFIG + (index - 1));
if (!inputKeyClass.isAssignableFrom(previousMapperConf.getClass(
MAPPER_OUTPUT_KEY_CLASS, null))) {
- throw new IllegalArgumentException("The Mapper output key class does"
- + " not match the previous Mapper input key class");
+ throw new IllegalArgumentException("The specified Mapper input key class does"
+ + " not match the previous Mapper's output key class.");
}
if (!inputValueClass.isAssignableFrom(previousMapperConf.getClass(
MAPPER_OUTPUT_VALUE_CLASS, null))) {
- throw new IllegalArgumentException("The Mapper output value class"
- + " does not match the previous Mapper input value class");
+ throw new IllegalArgumentException("The specified Mapper input value class"
+ + " does not match the previous Mapper's output value class.");
}
}
}
