Mark, This is a manifestation of NIFI-9433 [1] that we fixed a while back. Recommend you upgrade your installation.
Thanks -Mark [1] https://issues.apache.org/jira/browse/NIFI-9433 On Jun 10, 2022, at 1:16 PM, Mark Bean <mark.o.b...@gmail.com<mailto:mark.o.b...@gmail.com>> wrote: We have a situation where several flowfiles have lost their content. They still appear on the graph, but any attempt by a processor to access content results in a NullPointerException. The identified content claim file is in fact missing from the file system. Also, there are ERROR log messages indicating the claimant count is a negative value. o.a.n.c.r.c.StandardResourceClaimManager Decremented claimant count for StandardResourceClaim[id=1234-567, containter=default, section=890] to -1 (There are also some with negative values as low as -4.) Anecdotally, we are suspecting this may have been caused by incomplete connection load balance. And, if this is the case, it is not clear if the content successfully reached another Node and the FlowFile simply didn't finish cleaning up, or if content was prematurely dropped. It should be noted that the cluster was upgraded/restarted at or about the time the errors started. Could a shutdown of NiFi cause data loss if a load balance was currently in progress? NiFi 1.14.0 Thanks, Mark
