@ThongPham  Sounds like you may making a lot of unnecessary rest-api calls that could impact your NiFi's overall performance.   Have you maybe looked at using the SiteToSiteBulletingReportingTask? This reporting task will send a FlowFile to a remote input port upon execution of bulletin(s) are produced.  That Remote Input Port could then be built into a dataflow that makes notifications via putEmail.  So instead of constantly calling the rest-api to see if something happened in the last 5 minutes, the flow will simply send something out when it happens only.   If you found this response assisted with your query, please take a moment to login and click on "Accept as Solution" below this post. Thank you, Matt ... View more