Github user pnowojski commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4561#discussion_r134759790
  
    --- Diff: 
flink-streaming-java/src/test/java/org/apache/flink/streaming/api/functions/sink/TwoPhaseCommitSinkFunctionTest.java
 ---
    @@ -185,11 +253,44 @@ protected void recoverAndAbort(FileTransaction 
transaction) {
     
        private static class FileTransaction {
                private final File tmpFile;
    -           private final transient Writer writer;
    +           private final transient BufferedWriter writer;
     
                public FileTransaction(File tmpFile) throws IOException {
                        this.tmpFile = tmpFile;
                        this.writer = new BufferedWriter(new 
FileWriter(tmpFile));
                }
    +
    +           @Override
    +           public String toString() {
    +                   return String.format("FileTransaction[%s]", 
tmpFile.getName());
    +           }
    +   }
    +
    +   private static class TestContext implements AutoCloseable {
    +           public final File tmpDirectory = 
Files.createTempDirectory(TwoPhaseCommitSinkFunctionTest.class.getSimpleName() 
+ "_tmp").toFile();
    +           public final File targetDirectory = 
Files.createTempDirectory(TwoPhaseCommitSinkFunctionTest.class.getSimpleName() 
+ "_target").toFile();
    +
    +           public FileBasedSinkFunction sinkFunction;
    +           public OneInputStreamOperatorTestHarness<String, Object> 
harness;
    +
    +           private TestContext() throws Exception {
    +                   tmpDirectory.deleteOnExit();
    --- End diff --
    
    I think I wouldn't be able to use the `@Rule` here for those directories. I 
would have to write my own rule, that would wrap whole `TestContext`, right? If 
so, can we leave as it is for know, because currently I'm getting stack  
overflow exceptions with number of opened issues that I'm currently working on 
;)


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