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From "Chao Sun" <chao....@cloudera.com>
Subject Review Request 27046: HIVE-8545 - Exception when casting Text to BytesWritable [Spark Branch]
Date Wed, 22 Oct 2014 17:50:56 GMT

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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/27046/
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Review request for hive, Brock Noland and Xuefu Zhang.


Bugs: hive-8545
    https://issues.apache.org/jira/browse/hive-8545


Repository: hive-git


Description
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With the current multi-insertion implementation, when caching is enabled for input RDD, query
may fail with the following exception:
2014-10-21 13:57:34,742 WARN  [task-result-getter-0]: scheduler.TaskSetManager (Logging.scala:logWarning(71))
- Lost task 0.0 in stage 1.0 (TID 1, localhost): java.lang.ClassCastException: org.apache.hadoop.io.Text
cannot be cast to org.apache.hadoop.io.BytesWritable
        org.apache.hadoop.hive.ql.exec.spark.MapInput$CopyFunction.call(MapInput.java:67)
        org.apache.hadoop.hive.ql.exec.spark.MapInput$CopyFunction.call(MapInput.java:61)
        org.apache.spark.api.java.JavaPairRDD$$anonfun$pairFunToScalaFun$1.apply(JavaPairRDD.scala:1002)
        org.apache.spark.api.java.JavaPairRDD$$anonfun$pairFunToScalaFun$1.apply(JavaPairRDD.scala:1002)
        scala.collection.Iterator$$anon$11.next(Iterator.scala:328)
        org.apache.spark.storage.MemoryStore.unrollSafely(MemoryStore.scala:234)
        org.apache.spark.CacheManager.putInBlockManager(CacheManager.scala:163)
        org.apache.spark.CacheManager.getOrCompute(CacheManager.scala:70)
        org.apache.spark.rdd.RDD.iterator(RDD.scala:227)
        org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:35)
        org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:262)
        org.apache.spark.rdd.RDD.iterator(RDD.scala:229)
        org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:68)
        org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:41)
        org.apache.spark.scheduler.Task.run(Task.scala:56)
        org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:181)
        java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        java.lang.Thread.run(Thread.java:745)
The fix should be easy. However, interestingly, this error doesn't show up when the caching
is turned off. We need to find out why.


Diffs
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  ql/src/java/org/apache/hadoop/hive/ql/exec/spark/HiveBaseFunctionResultList.java dc5d148

  ql/src/java/org/apache/hadoop/hive/ql/exec/spark/HiveCopyFunction.java PRE-CREATION 
  ql/src/java/org/apache/hadoop/hive/ql/exec/spark/MapInput.java 9849b49 
  ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SparkPlanGenerator.java 25a4515 
  ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SparkTran.java 8a3dbf2 
  ql/src/java/org/apache/hadoop/hive/ql/exec/spark/SparkUtilities.java 0f21b46 

Diff: https://reviews.apache.org/r/27046/diff/


Testing
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Thanks,

Chao Sun


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