I seem to have encountered an error in NiFi-1.0.0 where I am unable to save when using the Advanced UI setting in the Update Attribute Processor and is giving the following error:
Unable to save UpdateAttribute[id=] criteria: org.apache.nifi.cluster.manager.exception.IllegalClusterStateException: Node is unable to fulfill this request due to: Transaction is already in progress.
This error seems to be a bug from the NiFi-1.0.0 version and I wanted to verify if there is a patch for this bug?
If you are using NiFi 1.0.0 with HDF 2.0 there is a plan for another release (e.g. v. 2.0.1) that should include this fix. In the meantime if you are using NiFi outside of HDF the current course of action is to download the actual NiFi source and build it separately (unfortunately there isn't a specific patch file to apply to an existing installation). Here is the quick start guide that has information on building from source.
I hope this helps and thank you for highlighting this issue.