Github user zsxwing commented on a diff in the pull request: https://github.com/apache/spark/pull/16989#discussion_r124959257 --- Diff: common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/OneForOneBlockFetcher.java --- @@ -126,4 +150,38 @@ private void failRemainingBlocks(String[] failedBlockIds, Throwable e) { } } } + + private class DownloadCallback implements StreamCallback { + + private WritableByteChannel channel = null; + private File targetFile = null; + private int chunkIndex; + + public DownloadCallback(File targetFile, int chunkIndex) throws IOException { + this.targetFile = targetFile; + this.channel = Channels.newChannel(new FileOutputStream(targetFile)); --- End diff -- @jinxing64 The retry logic is here: https://github.com/apache/spark/blob/88a536babf119b7e331d02aac5d52b57658803bf/common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/RetryingBlockFetcher.java#L215 The issue is there will be two `DownloadCallback`s download the same content to the same target file. While the first one finishes, ShuffleBlockFetcherIterator may start to read it, however, the second `DownloadCallback` may be still running and writing to the target file. It could cause `ShuffleBlockFetcherIterator` reading a partial result.
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