https://community.cloudera.com/t5/Support-Questions/NiFi-Script-count-fileFlows-Groovy/m-p/210329#M172271 <P>I'm not sure if I fully understand how your downstream flow would work when there are &lt; 9 flow files available to ExecuteScript, but here's something to try (note that you can use anything greater than 9 in place of the "10" below):</P><PRE>def flowFiles = session.get(10)<BR />if(flowFiles.size() &gt;= 9) {<BR /> session.remove(flowFiles)<BR />} else {<BR /> session.transfer(flowFiles, REL_SUCCESS)<BR />} </PRE> Tue, 16 Oct 2018 01:59:47 GMT mburgess 2018-10-16T01:59:47Z