Github user sachingoel0101 commented on the pull request: https://github.com/apache/flink/pull/1214#issuecomment-155717073 @mxm , fortunately, this time I was able to run the tests on my machine. :) I'm seeing a strange error. This is the error in Task manager log file for per job detached streaming test: ```java java.io.IOException: File or directory already exists. Existing files and directories are not overwritten in NO_OVERWRITE mode. Use OVERWRITE mode to overwrite existing files and directories. at org.apache.flink.core.fs.FileSystem.initOutPathLocalFS(FileSystem.java:549) at org.apache.flink.api.common.io.FileOutputFormat.open(FileOutputFormat.java:226) at org.apache.flink.api.java.io.TextOutputFormat.open(TextOutputFormat.java:77) at org.apache.flink.streaming.api.functions.sink.FileSinkFunction.open(FileSinkFunction.java:62) at org.apache.flink.api.common.functions.util.FunctionUtils.openFunction(FunctionUtils.java:36) at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.open(AbstractUdfStreamOperator.java:89) at org.apache.flink.streaming.runtime.tasks.StreamTask.openAllOperators(StreamTask.java:286) at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:213) at org.apache.flink.runtime.taskmanager.Task.run(Task.java:584) at java.lang.Thread.run(Thread.java:745) ``` This is surprising because I have made no changes to the way file writes or overwrites are handled. Here's the thing though: it should fail, because the folder is created at line 475 in `YarnSessionFIFOITCase` and the program will need to overwrite it. ```java File tmpOutFolder = null; try{ tmpOutFolder = tmp.newFolder(); } catch(IOException e) { throw new RuntimeException(e); } ``` But the tests always pass on the master branch. The rest of the tests which follow this automatically fail because they again check all the logs files for exception strings.
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