[jira] [Created] (SPARK-3764) Invalid dependencies of artifacts in Maven Central Repository.

["Takuya Ueshin (JIRA)" <ji...@apache.org>]

Takuya Ueshin created SPARK-3764:
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             Summary: Invalid dependencies of artifacts in Maven Central Repository.
                 Key: SPARK-3764
                 URL: https://issues.apache.org/jira/browse/SPARK-3764
             Project: Spark
          Issue Type: Bug
          Components: Build
    Affects Versions: 1.1.0
            Reporter: Takuya Ueshin


While testing my spark applications locally using spark artifacts downloaded from Maven Central, the following exception was thrown:

{quote}
ERROR executor.ExecutorUncaughtExceptionHandler: Uncaught exception in thread Thread[Executor task launch worker-2,5,main]
java.lang.IncompatibleClassChangeError: Found class org.apache.hadoop.mapreduce.TaskAttemptContext, but interface was expected
	at org.apache.spark.sql.parquet.AppendingParquetOutputFormat.getDefaultWorkFile(ParquetTableOperations.scala:334)
	at parquet.hadoop.ParquetOutputFormat.getRecordWriter(ParquetOutputFormat.java:251)
	at org.apache.spark.sql.parquet.InsertIntoParquetTable.org$apache$spark$sql$parquet$InsertIntoParquetTable$$writeShard$1(ParquetTableOperations.scala:300)
	at org.apache.spark.sql.parquet.InsertIntoParquetTable$$anonfun$saveAsHadoopFile$1.apply(ParquetTableOperations.scala:318)
	at org.apache.spark.sql.parquet.InsertIntoParquetTable$$anonfun$saveAsHadoopFile$1.apply(ParquetTableOperations.scala:318)
	at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:62)
	at org.apache.spark.scheduler.Task.run(Task.scala:54)
	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:177)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
{quote}

This is because the hadoop class {{TaskAttemptContext}} is incompatible between hadoop-1 and hadoop-2.

I guess the spark artifacts in Maven Central were built against hadoop-2 with Maven, but the depending version of hadoop in {{pom.xml}} remains 1.0.4, so the hadoop version mismatch is happend.

FYI:
sbt seems to publish 'effective pom'-like pom file, so the dependencies are correctly resolved.



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