We've also run into exactly this problem. So far we've tested a combination of NiFi and Java versions with mixed success: seems like the issue is a Java one and is present in a few different versions/distributions of Java. Same symptoms: InvokeHTTP slowly locks up until all threads are locked and the queues back up. Couldn't reproduce on a simple AWS deployment, involing one EC2 instance running an HTTP server serving a small binary file, and another running a single node 2-core nifi cluster. Haven't tested with a larger instance yet. NiFi 1.9.2 NiFi 1.11.4 NiFi 1.12.1 Oracle Java 1.8u144 works works not tested OpenJDK 1.8u242 n/t n/t about to test OpenJDK 1.8u252 fails fails fails OpenJDK 11.0.7 n/t n/t fails Amazon Corretto 11.0.8 n/t n/t fails
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