External Hadoop client like Pig/Hive use intermediate output formats. Earlier the write operator used to open a FSDataOutputStream and push in the bytes. This works fine but not with some custom output formats that do not write into HDFS but to some local storage. In order to be compatible with such custom formats, we must get the writer from the custom format. This check in ensures the the writer writes in a manner similar to the custom output format
git-svn-id: https://hyracks.googlecode.com/svn/trunk@191 123451ca-8445-de46-9d55-352943316053
diff --git a/hyracks/hyracks-dataflow-hadoop/.settings/org.eclipse.jdt.core.prefs b/hyracks/hyracks-dataflow-hadoop/.settings/org.eclipse.jdt.core.prefs
index 1a27838..7404d54 100644
--- a/hyracks/hyracks-dataflow-hadoop/.settings/org.eclipse.jdt.core.prefs
+++ b/hyracks/hyracks-dataflow-hadoop/.settings/org.eclipse.jdt.core.prefs
@@ -1,6 +1,264 @@
-#Fri Aug 13 04:07:04 PDT 2010
+#Tue Nov 02 17:09:03 PDT 2010
eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.6
org.eclipse.jdt.core.compiler.compliance=1.6
org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
org.eclipse.jdt.core.compiler.source=1.6
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+org.eclipse.jdt.core.formatter.use_tabs_only_for_leading_indentations=false
+org.eclipse.jdt.core.formatter.wrap_before_binary_operator=true
diff --git a/hyracks/hyracks-dataflow-hadoop/src/main/java/edu/uci/ics/hyracks/dataflow/hadoop/HadoopWriteOperatorDescriptor.java b/hyracks/hyracks-dataflow-hadoop/src/main/java/edu/uci/ics/hyracks/dataflow/hadoop/HadoopWriteOperatorDescriptor.java
index 24103c6..d9b41ce 100644
--- a/hyracks/hyracks-dataflow-hadoop/src/main/java/edu/uci/ics/hyracks/dataflow/hadoop/HadoopWriteOperatorDescriptor.java
+++ b/hyracks/hyracks-dataflow-hadoop/src/main/java/edu/uci/ics/hyracks/dataflow/hadoop/HadoopWriteOperatorDescriptor.java
@@ -53,14 +53,20 @@
private static String nullWritableClassName = NullWritable.class.getName();
- private static class HadoopFileWriter implements IRecordWriter {
+ private class HadoopFileWriter implements IRecordWriter {
Object recordWriter;
JobConf conf;
final boolean useNewMapReduceLib;
- HadoopFileWriter(Object recordWriter,JobConf conf) {
+ Path finalOutputFile;
+ Path tempOutputFile;
+
+
+ HadoopFileWriter(Object recordWriter,Path tempOutputFile,Path outputFile,JobConf conf) {
this.recordWriter = recordWriter;
this.conf = conf;
+ this.finalOutputFile = outputFile;
+ this.tempOutputFile = tempOutputFile;
useNewMapReduceLib = conf.getUseNewMapper();
}
@@ -80,6 +86,7 @@
((org.apache.hadoop.mapreduce.RecordWriter)recordWriter).close(new TaskAttemptContext(conf, new TaskAttemptID()));
} else {
((org.apache.hadoop.mapred.RecordWriter)recordWriter).close(null);
+ FileSystem.get(conf).rename( tempOutputFile, finalOutputFile);
}
} catch (Exception e) {
e.printStackTrace();
@@ -126,6 +133,8 @@
ioe.printStackTrace();
}
Path path = new Path(fileSplit.getPath());
+ Path tempOutputFile = null;
+ Path finalOutputFile = null;
checkIfCanWriteToHDFS(new FileSplit[] { fileSplit });
Object recordWriter = null;
boolean sequenceFileOutput = false;
@@ -141,14 +150,26 @@
if(conf.getOutputFormat() instanceof SequenceFileOutputFormat) {
sequenceFileOutput = true;
} else {
- recordWriter = conf.getOutputFormat().getRecordWriter(fileSystem, conf, "" + System.currentTimeMillis(), new Progressable() {
+ String taskAttempId = new TaskAttemptID().toString();
+ conf.set("mapred.task.id",taskAttempId);
+ outputPath = new Path(conf.get("mapred.output.dir"));
+ outputTempPath = new Path(outputPath,"_temporary");
+ if(outputPath != null && !fileSystem.exists(outputPath)) {
+ fileSystem.mkdirs(outputTempPath);
+ }
+ String suffix = new String("part-00000");
+ suffix = new String(suffix.substring(0, suffix.length() - ("" + index).length()));
+ suffix = suffix + index;
+ tempOutputFile = new Path(outputTempPath,"_" + taskAttempId + "/" + suffix);
+ finalOutputFile = new Path(outputPath,suffix);
+ recordWriter = conf.getOutputFormat().getRecordWriter(fileSystem, conf,suffix, new Progressable() {
@Override
public void progress() {}
});
}
}
if(!sequenceFileOutput) {
- return new HadoopFileWriter(recordWriter,conf);
+ return new HadoopFileWriter(recordWriter,tempOutputFile,finalOutputFile,conf);
} else {
Class keyClass = Class.forName(conf.getOutputKeyClass().getName());
Class valueClass = Class.forName(conf.getOutputValueClass().getName());
@@ -159,7 +180,9 @@
}
-
+ Path outputPath;
+ Path outputTempPath;
+
protected Reporter createReporter() {
return new Reporter() {
@Override