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https://issues.apache.org/jira/browse/SPARK-5581?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15187538#comment-15187538
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Josh Rosen commented on SPARK-5581:
-----------------------------------
As long as we're not fsyncing then hopefully the number of partitions won't
matter as much since all of the writes will be going to the same file, right?
> When writing sorted map output file, avoid open / close between each partition
> ------------------------------------------------------------------------------
>
> Key: SPARK-5581
> URL: https://issues.apache.org/jira/browse/SPARK-5581
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle
> Affects Versions: 1.3.0
> Reporter: Sandy Ryza
>
> {code}
> // Bypassing merge-sort; get an iterator by partition and just write
> everything directly.
> for ((id, elements) <- this.partitionedIterator) {
> if (elements.hasNext) {
> val writer = blockManager.getDiskWriter(
> blockId, outputFile, ser, fileBufferSize,
> context.taskMetrics.shuffleWriteMetrics.get)
> for (elem <- elements) {
> writer.write(elem)
> }
> writer.commitAndClose()
> val segment = writer.fileSegment()
> lengths(id) = segment.length
> }
> }
> {code}
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