Github user mcgilman commented on the issue:
https://github.com/apache/nifi/pull/2519
@mattyb149 Previously the loading of Snappy happened during onTrigger. This
could lead to the race condition described in the JIRA/PR. Moving this to a
static initializer should alleviate the issue. Additionally, the act of service
discovery (Java SPI) will load the class. Because of this, I actually don't
believe the synchronization here is necessary. Thoughts?---
