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https://issues.apache.org/jira/browse/SPARK-12055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15034640#comment-15034640
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Yin Huai commented on SPARK-12055:
----------------------------------
It is very possible that https://issues.apache.org/jira/browse/SPARK-12030 is
the root cause.
> TimSort failing with error when writing a partitioned data set
> --------------------------------------------------------------
>
> Key: SPARK-12055
> URL: https://issues.apache.org/jira/browse/SPARK-12055
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Yin Huai
> Priority: Blocker
>
> When we need to sort rows based on partitioning columns within a task,
> timsort somehow failed. I do not know what is the cause. The only thing I
> know right now is that the partitioning columns are three string columns.
> {code}
> org.apache.spark.SparkException: Task failed while writing rows.
> at
> org.apache.spark.sql.execution.datasources.DynamicPartitionWriterContainer.writeRows(WriterContainer.scala:396)
> at
> org.apache.spark.sql.execution.datasources.InsertIntoHadoopFsRelation$$anonfun$run$1$$anonfun$apply$mcV$sp$3.apply(InsertIntoHadoopFsRelation.scala:150)
> at
> org.apache.spark.sql.execution.datasources.InsertIntoHadoopFsRelation$$anonfun$run$1$$anonfun$apply$mcV$sp$3.apply(InsertIntoHadoopFsRelation.scala:150)
> at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:66)
> at org.apache.spark.scheduler.Task.run(Task.scala:88)
> at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:214)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.IllegalArgumentException: Comparison method violates its
> general contract!
> at
> org.apache.spark.util.collection.TimSort$SortState.mergeLo(TimSort.java:794)
> at
> org.apache.spark.util.collection.TimSort$SortState.mergeAt(TimSort.java:525)
> at
> org.apache.spark.util.collection.TimSort$SortState.mergeCollapse(TimSort.java:453)
> at
> org.apache.spark.util.collection.TimSort$SortState.access$200(TimSort.java:325)
> at org.apache.spark.util.collection.TimSort.sort(TimSort.java:153)
> at org.apache.spark.util.collection.Sorter.sort(Sorter.scala:37)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeInMemorySorter.getSortedIterator(UnsafeInMemorySorter.java:231)
> at
> org.apache.spark.util.collection.unsafe.sort.UnsafeExternalSorter.getSortedIterator(UnsafeExternalSorter.java:404)
> at
> org.apache.spark.sql.execution.UnsafeKVExternalSorter.sortedIterator(UnsafeKVExternalSorter.java:159)
> at
> org.apache.spark.sql.execution.datasources.DynamicPartitionWriterContainer.writeRows(WriterContainer.scala:365)
> ... 8 more
> {code}
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