Nifi FetchSFTP changes the order of files in queue

[#1]

I am using ListSFTP and then FetchSFTP to pull data from SFTP server. The ListSFTP outputs the file in following order in the queue

file_A.xml

file_B.xml

However, FetchSFTP changes the order of flow files when it downloads the file.

file_B.xml

file_A.xml

Is there any way to ensure that the order of flow files in the queue doesn't get changed?

[#2]

@Manoj

I think as soon as fetch completed then FetchSFTP processor outputs the flowfile, in your case file_B.xml fetch finished first that file_A.xml fetch.

You can use EnforceOrder processor after FetchSFTP processor to keep your source orders as is.

Refer to this link for more details regards to usage/configuring EnforceOrder processor.

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[#3]

I have Concurrent Tasks=1 configured. My assumption is that FetchSFTP will attempt to download one file at a time based on the input queue order. Even in this case does FetchSFTP attempt to pull file in parallel?