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HADOOP-12406. Fixed AbstractMapWritable.readFields to use the thread's ClassLoader to load class instead of System ClassLoader. Contributed by Nadeem Douba. 

(cherry picked from commit 069c6c62de)
This commit is contained in:
Vinod Kumar Vavilapalli 2016-04-11 12:00:51 -07:00
parent f1a370ce8b
commit 4041d2b49e
1 changed files with 9 additions and 7 deletions
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16
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/AbstractMapWritable.java
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@ -181,20 +181,22 @@ public abstract class AbstractMapWritable implements Writable, Configurable {
public void readFields(DataInput in) throws IOException {
// Get the number of "unknown" classes
newClasses = in.readByte();
// Use the classloader of the current thread to load classes instead of the
// system-classloader so as to support both client-only and inside-a-MR-job
// use-cases. The context-loader by default eventually falls back to the
// system one, so there should be no cases where changing this is an issue.
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
// Then read in the class names and add them to our tables
for (int i = 0; i < newClasses; i++) {
byte id = in.readByte();
String className = in.readUTF();
try {
addToMap(Class.forName(className), id);
addToMap(classLoader.loadClass(className), id);
} catch (ClassNotFoundException e) {
throw new IOException("can't find class: " + className + " because "+
e.getMessage());
throw new IOException(e);
}
}
}