Michael Moser updated NIFI-2636:
    Affects Version/s: 1.0.0

> UnpackContent has concurrent thread safety issue, causes flowfiles to fail
> --------------------------------------------------------------------------
>                 Key: NIFI-2636
>                 URL: https://issues.apache.org/jira/browse/NIFI-2636
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Extensions
>    Affects Versions: 1.0.0, 0.7.0
>            Reporter: Michael Moser
>            Assignee: Michael Moser
>             Fix For: 1.1.0, 0.8.0
> Shortly after merging NIFI-2611 I took a last look at the code and noticed 
> that each onTrigger() call, when the Packaging Format property is set to "use 
> mime.type attribute", that the class instance variable "private Unpacker 
> unpacker" can change.  When UnpackContent is set to > 1 concurrent task, this 
> isn't thread safe.  Thread A can set the unpacker to the TarUnpacker, but 
> before it gets a chance to unpack its tar file, Thread B changes the unpacker 
> to a FlowFileUnpackagerV3 which causes Thread A to fail its unpack.

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