Github user wangyum commented on a diff in the pull request:
https://github.com/apache/spark/pull/16990#discussion_r103200223
--- Diff: python/pyspark/tests.py ---
@@ -1515,12 +1515,12 @@ def test_oldhadoop(self):
conf = {
"mapred.output.format.class":
"org.apache.hadoop.mapred.SequenceFileOutputFormat",
--- End diff --
@srowen Thanks, you are right. see:
https://github.com/apache/hadoop/blob/release-3.0.0-alpha2-RC0/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/Job.java#L1296
if set `mapred.reducer.new-api=true`, the exception:
```
Exception in thread "main" java.io.IOException: mapred.output.format.class
is incompatible with new reduce API mode.
at org.apache.hadoop.mapreduce.Job.ensureNotSet(Job.java:1210)
at org.apache.hadoop.mapreduce.Job.setUseNewAPI(Job.java:1258)
at org.apache.hadoop.mapreduce.Job.submit(Job.java:1299)
at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:1324)
at wpmcn.hadoop.WordCount.main(WordCount.java:63)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.apache.hadoop.util.RunJar.run(RunJar.java:221)
at org.apache.hadoop.util.RunJar.main(RunJar.java:136)
```
I will update it soon.
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