Github user mridulm commented on a diff in the pull request:
https://github.com/apache/spark/pull/16989#discussion_r115409001
--- Diff:
common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/OneForOneBlockFetcher.java
---
@@ -126,4 +149,38 @@ 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));
+ this.chunkIndex = chunkIndex;
+ }
+
+ @Override
+ public void onData(String streamId, ByteBuffer buf) throws IOException
{
+ channel.write(buf);
--- End diff --
As an impl detail (since channel is a FOS), this will work - but in
general, channel.write() need not write buf.remain(); which actually breaks
spark code iirc - since it expects odData to completely consume the data.
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