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https://issues.apache.org/jira/browse/SPARK-17562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15496183#comment-15496183
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Jianfei Wang commented on SPARK-17562:
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if 0 object is written, we should just set the success flag and then go into
finally block , we need't call this.
> I think a little code is unnecessary to exist in
> ExternalSorter.spillMemoryIteratorToDisk
> -----------------------------------------------------------------------------------------
>
> Key: SPARK-17562
> URL: https://issues.apache.org/jira/browse/SPARK-17562
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.0.0
> Reporter: Jianfei Wang
> Priority: Trivial
> Labels: easyfix, performance
>
> In ExternalSorter.spillMemoryIteratorToDisk, I think the code below will
> never be executed, so we can remove them
> {code}
> else {
> writer.revertPartialWritersAndClose()
> }
> {code}
> the source code is as below:
> {code}
> try {
> while (inMemoryIterator.hasNext) {
> val partitionId = inMemoryIterator.nextPartition()
> require(partitionId >= 0 && partitionId < numPartitions,
> s"partition Id: ${partitionId} should be in the range [0,
> ${numPartitions})")
> inMemoryIterator.writeNext(writer)
> elementsPerPartition(partitionId) += 1
> objectsWritten += 1
> if (objectsWritten == serializerBatchSize) {
> flush()
> }
> }
> if (objectsWritten > 0) {
> flush()
> } else {
> writer.revertPartialWritesAndClose()
> }
> success = true
> } finally {
> if (success) {
> writer.close()
> } else {
> // This code path only happens if an exception was thrown above
> before we set success;
> // close our stuff and let the exception be thrown further
> writer.revertPartialWritesAndClose()
> if (file.exists()) {
> if (!file.delete()) {
> logWarning(s"Error deleting ${file}")
> }
> }
> }
> }
> {code}
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