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MAPREDUCE-3808. Fixed an NPE in FileOutputCommitter for jobs with maps but no reduces. Contributed by Robert Joseph Evans.

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1241217 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Vinod Kumar Vavilapalli 2012-02-06 22:16:26 +00:00
parent c6282df3e5
commit 9f2b77aee4
4 changed files with 79 additions and 37 deletions
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3
hadoop-mapreduce-project/CHANGES.txt
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@ -715,6 +715,9 @@ Release 0.23.1 - Unreleased
MAPREDUCE-3813. Added a cache for resolved racks. (vinodkv via acmurthy)
MAPREDUCE-3808. Fixed an NPE in FileOutputCommitter for jobs with maps
but no reduces. (Robert Joseph Evans via vinodkv)
Release 0.23.0 - 2011-11-01
INCOMPATIBLE CHANGES

21
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapred/FileOutputCommitter.java
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@ -85,18 +85,21 @@ private static Path getOutputPath(TaskAttemptContext context) {
*/
@Private
Path getJobAttemptPath(JobContext context) {
return org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter
.getJobAttemptPath(context, getOutputPath(context));
Path out = getOutputPath(context);
return out == null ? null :
org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter
.getJobAttemptPath(context, out);
}
@Private
Path getTaskAttemptPath(TaskAttemptContext context) throws IOException {
return getTaskAttemptPath(context, getOutputPath(context));
Path out = getOutputPath(context);
return out == null ? null : getTaskAttemptPath(context, out);
}
private Path getTaskAttemptPath(TaskAttemptContext context, Path out) throws IOException {
Path workPath = FileOutputFormat.getWorkOutputPath(context.getJobConf());
if(workPath == null) {
if(workPath == null && out != null) {
return org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter
.getTaskAttemptPath(context, out);
}
@ -110,14 +113,17 @@ private Path getTaskAttemptPath(TaskAttemptContext context, Path out) throws IOE
* @return the path where the output of a committed task is stored until
* the entire job is committed.
*/
@Private
Path getCommittedTaskPath(TaskAttemptContext context) {
return org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter
.getCommittedTaskPath(context, getOutputPath(context));
Path out = getOutputPath(context);
return out == null ? null :
org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter
.getCommittedTaskPath(context, out);
}
public Path getWorkPath(TaskAttemptContext context, Path outputPath)
throws IOException {
return getTaskAttemptPath(context, outputPath);
return outputPath == null ? null : getTaskAttemptPath(context, outputPath);
}
@Override
@ -156,6 +162,7 @@ public void abortJob(JobContext context, int runState)
getWrapped(context).abortJob(context, state);
}
@Override
public void setupTask(TaskAttemptContext context) throws IOException {
getWrapped(context).setupTask(context);
}

58
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/output/FileOutputCommitter.java
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@ -495,36 +495,40 @@ public boolean isRecoverySupported() {
@Override
public void recoverTask(TaskAttemptContext context)
throws IOException {
context.progress();
TaskAttemptID attemptId = context.getTaskAttemptID();
int previousAttempt = getAppAttemptId(context) - 1;
if (previousAttempt < 0) {
throw new IOException ("Cannot recover task output for first attempt...");
}
Path committedTaskPath = getCommittedTaskPath(context);
Path previousCommittedTaskPath = getCommittedTaskPath(
previousAttempt, context);
FileSystem fs = committedTaskPath.getFileSystem(context.getConfiguration());
LOG.debug("Trying to recover task from " + previousCommittedTaskPath
+ " into " + committedTaskPath);
if (fs.exists(previousCommittedTaskPath)) {
if(fs.exists(committedTaskPath)) {
if(!fs.delete(committedTaskPath, true)) {
throw new IOException("Could not delete "+committedTaskPath);
if(hasOutputPath()) {
context.progress();
TaskAttemptID attemptId = context.getTaskAttemptID();
int previousAttempt = getAppAttemptId(context) - 1;
if (previousAttempt < 0) {
throw new IOException ("Cannot recover task output for first attempt...");
}
Path committedTaskPath = getCommittedTaskPath(context);
Path previousCommittedTaskPath = getCommittedTaskPath(
previousAttempt, context);
FileSystem fs = committedTaskPath.getFileSystem(context.getConfiguration());
LOG.debug("Trying to recover task from " + previousCommittedTaskPath
+ " into " + committedTaskPath);
if (fs.exists(previousCommittedTaskPath)) {
if(fs.exists(committedTaskPath)) {
if(!fs.delete(committedTaskPath, true)) {
throw new IOException("Could not delete "+committedTaskPath);
}
}
//Rename can fail if the parent directory does not yet exist.
Path committedParent = committedTaskPath.getParent();
fs.mkdirs(committedParent);
if(!fs.rename(previousCommittedTaskPath, committedTaskPath)) {
throw new IOException("Could not rename " + previousCommittedTaskPath +
" to " + committedTaskPath);
}
LOG.info("Saved output of " + attemptId + " to " + committedTaskPath);
} else {
LOG.warn(attemptId+" had no output to recover.");
}
//Rename can fail if the parent directory does not yet exist.
Path committedParent = committedTaskPath.getParent();
fs.mkdirs(committedParent);
if(!fs.rename(previousCommittedTaskPath, committedTaskPath)) {
throw new IOException("Could not rename " + previousCommittedTaskPath +
" to " + committedTaskPath);
}
LOG.info("Saved output of " + attemptId + " to " + committedTaskPath);
} else {
LOG.warn(attemptId+" had no output to recover.");
LOG.warn("Output Path is null in recoverTask()");
}
}
}

34
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/test/java/org/apache/hadoop/mapred/TestFileOutputCommitter.java
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@ -104,7 +104,9 @@ public void testRecovery() throws Exception {
writeOutput(theRecordWriter, tContext);
// do commit
committer.commitTask(tContext);
if(committer.needsTaskCommit(tContext)) {
committer.commitTask(tContext);
}
Path jobTempDir1 = committer.getCommittedTaskPath(tContext);
File jtd1 = new File(jobTempDir1.toUri().getPath());
assertTrue(jtd1.exists());
@ -188,7 +190,9 @@ public void testCommitter() throws Exception {
writeOutput(theRecordWriter, tContext);
// do commit
committer.commitTask(tContext);
if(committer.needsTaskCommit(tContext)) {
committer.commitTask(tContext);
}
committer.commitJob(jContext);
// validate output
@ -214,7 +218,9 @@ public void testMapFileOutputCommitter() throws Exception {
writeMapFileOutput(theRecordWriter, tContext);
// do commit
committer.commitTask(tContext);
if(committer.needsTaskCommit(tContext)) {
committer.commitTask(tContext);
}
committer.commitJob(jContext);
// validate output
@ -222,6 +228,28 @@ public void testMapFileOutputCommitter() throws Exception {
FileUtil.fullyDelete(new File(outDir.toString()));
}
public void testMapOnlyNoOutput() throws Exception {
JobConf conf = new JobConf();
//This is not set on purpose. FileOutputFormat.setOutputPath(conf, outDir);
conf.set(JobContext.TASK_ATTEMPT_ID, attempt);
JobContext jContext = new JobContextImpl(conf, taskID.getJobID());
TaskAttemptContext tContext = new TaskAttemptContextImpl(conf, taskID);
FileOutputCommitter committer = new FileOutputCommitter();
// setup
committer.setupJob(jContext);
committer.setupTask(tContext);
if(committer.needsTaskCommit(tContext)) {
// do commit
committer.commitTask(tContext);
}
committer.commitJob(jContext);
// validate output
FileUtil.fullyDelete(new File(outDir.toString()));
}
public void testAbort() throws IOException, InterruptedException {
JobConf conf = new JobConf();
FileOutputFormat.setOutputPath(conf, outDir);