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[SPARK-23399][SQL] Register a task completion listener first for OrcColumnarBatchReader #20590

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[SPARK-23399][SQL] Register a task completion listener first for OrcColumnarBatchReader #20590

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[SPARK-23399][SQL] Register a task completion listner first for OrcCo…
dongjoon-hyun Feb 12, 2018
3b8cb0a
Add a manual test case.
dongjoon-hyun Feb 13, 2018
d4cc32e
fix typo
dongjoon-hyun Feb 13, 2018
5a9fa0b
Remove test case.
dongjoon-hyun Feb 13, 2018
18c2485
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dongjoon-hyun Feb 13, 2018
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5 changes: 3 additions & 2 deletions sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/orc/OrcFileFormat.scala
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Expand Up @@ -188,6 +188,9 @@ class OrcFileFormat
if (enableVectorizedReader) {
val batchReader = new OrcColumnarBatchReader(
enableOffHeapColumnVector && taskContext.isDefined, copyToSpark, capacity)
val iter = new RecordReaderIterator(batchReader)
Option(TaskContext.get()).foreach(_.addTaskCompletionListener(_ => iter.close()))
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@kiszk kiszk Feb 13, 2018

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Could you please add comment why we put this registration here with SPARK-23399. Since we would forget this investigation in the future :), this comment will help us and will remind to run the test case manually.

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@dongjoon-hyun dongjoon-hyun Feb 13, 2018

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Sure!


batchReader.initialize(fileSplit, taskAttemptContext)
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@dongjoon-hyun dongjoon-hyun Feb 12, 2018 •
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According to the reported case, the ORC file is opened here.
But, it seems that the task is killed, TaskKilled (Stage cancelled), during initBatch before registering its listener . For a case throwing Exception at initBatch, this PR prevents the open file leakage.

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@dongjoon-hyun dongjoon-hyun Feb 12, 2018

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@cloud-fan and @gatorsmile . Could you take a look this?
For ORC library, it looks okay when we call close correctly.

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@viirya viirya Feb 13, 2018 •
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@dongjoon-hyun Thanks for this fix! My question is how do we know if close is not called before and is called now? Have you verified it?

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@viirya viirya Feb 13, 2018

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Because I tried to verify it manually in local, seems close is called before this change. Maybe I miss something or this is environment depending.

batchReader.initBatch(
reader.getSchema,
Expand All @@ -196,8 +199,6 @@ class OrcFileFormat
partitionSchema,
file.partitionValues)

val iter = new RecordReaderIterator(batchReader)
Option(TaskContext.get()).foreach(_.addTaskCompletionListener(_ => iter.close()))
iter.asInstanceOf[Iterator[InternalRow]]
} else {
val orcRecordReader = new OrcInputFormat[OrcStruct]
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