https://community.cloudera.com/t5/Support-Questions/NiFi-Wait-Notify-flow-not-working-as-expected/m-p/205832#M167798 <P>We're using a Wait/Notify pattern in one of our flows to overcome a race condition problem (object x is referencing object y, object x will wait until object y is created. Creation of object y will generate the notification). </P><P>This basically works for most of our flow files. Files are waiting in queue and are released when notified as expected. However, for some flow files the notify- signal for object y is sent but object x will still be stuck in waiting state, not reacting on it. </P><P>I have enabled persistence on the cache and verified that the notify- signals are really added to it. I have juggled the different parameters of the wait/notify- processors without any success (it should require minimal configuration though since we only have a 1 to 1 relation between wait and notify signals).</P><P>Any ideas? </P><P>We're using NiFi 1.6.0. </P> Thu, 04 Oct 2018 14:08:32 GMT alexander_jiteg 2018-10-04T14:08:32Z