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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