[GitHub] kezhuw commented on a change in pull request #7300: [FLINK-11151][rest] Create parent directories in FileUploadHandler

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kezhuw commented on a change in pull request #7300: [FLINK-11151][rest] Create parent directories in FileUploadHandler
URL: https://github.com/apache/flink/pull/7300#discussion_r241967901
 
 

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 File path: flink-runtime/src/main/java/org/apache/flink/runtime/rest/FileUploadHandler.java
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 @@ -102,6 +102,10 @@ protected void channelRead0(final ChannelHandlerContext ctx, final HttpObject ms
 						checkState(currentUploadDir == null);
 						currentHttpPostRequestDecoder = new HttpPostRequestDecoder(DATA_FACTORY, httpRequest);
 						currentHttpRequest = ReferenceCountUtil.retain(httpRequest);
+
+						// make sure that we still have a upload dir in case that it got deleted in the meanwhile
+						RestServerEndpoint.createUploadDir(uploadDir, LOG);
 
 Review comment:
   Branch `msg instanceof HttpContent && currentHttpPostRequestDecoder != null` has this statement too. Seems  that line is useless and can be deleted safely since following receiving work happens in `currentUploadDir` not its parent `uploadDir`. If `uploadDir` got deleted meanwhile, the upload request should fail due to potential lost of uploaded files, this is what will happen in `fileUpload.renameTo(dest.toFile())`.

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