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(Updated Oct. 23, 2014, 5:32 p.m.) Review request for hive, Brock Noland and Xuefu Zhang. Changes ------- Thanks Xuefu for the suggestions. This patch uses a blank Configuration instead of serialize/deserialize JobConf. Bugs: hive-8545 https://issues.apache.org/jira/browse/hive-8545 Repository: hive-git Description ------- 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 (updated) ----- ql/src/java/org/apache/hadoop/hive/ql/exec/spark/HiveBaseFunctionResultList.java dc5d148 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 ------- Thanks, Chao Sun