https://community.cloudera.com/t5/Support-Questions/NiFi-FetchFile-processor-Process-specific-filenames-from/m-p/286191#M212275 <P><a href="https://community.cloudera.com/t5/user/viewprofilepage/user-id/22431">@svasi</a>&nbsp;</P><P>&nbsp;</P><P>Sounds like you should be using a RouteOnAttribute processor between your listFile and FetchFile processor so that only those FlowFIles you want to Fetch the content for are routed to the FetchFile processor.<BR /><BR /></P><P>The listFile processor produces one FlowFile for each file that is returned during the listing execution.&nbsp; The listFile processor writes a number of FlowFile attributes to the FlowFiles that are produced.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Screen Shot 2019-12-23 at 12.26.43 PM.png" style="width: 999px;"><img src="https://community.cloudera.com/t5/image/serverpage/image-id/25808i7143670E31DA4C6A/image-size/large?v=v2&amp;px=999" role="button" title="Screen Shot 2019-12-23 at 12.26.43 PM.png" alt="Screen Shot 2019-12-23 at 12.26.43 PM.png" /></span><BR />The Filename attribute is what you will want to use when writing your NiFi Expression Language (EL) statement for your dynamically created properties added to the RouteOnAttribute processor.<BR /><BR />You can find a EL guide under "Help" under the NiFi global menu in the upper right corner of the NiFi UI.</P><P>&nbsp;</P><P>Hope this helps,</P><P>Matt</P> Mon, 23 Dec 2019 17:29:31 GMT MattWho 2019-12-23T17:29:31Z