https://community.cloudera.com/t5/Support-Questions/YARN-issues-critical-error-quot-ATSv2-HBase-Application-quot/m-p/234656#M196476 <P>After fresh installation I got the following critical error alert in YARN:</P><P>Title: ATSv2 HBase Application</P><P>Response: </P><PRE>Traceback (most recent call last): File "/var/lib/ambari-agent/cache/stacks/HDP/3.0/services/YARN/package/alerts/alert_ats_hbase.py", line 183, in execute ats_hbase_app_info = make_valid_json(output) File "/var/lib/ambari-agent/cache/stacks/HDP/3.0/services/YARN/package/alerts/alert_ats_hbase.py", line 226, in make_valid_json raise Fail("Couldn't validate the received output for JSON parsing.") Fail: Couldn't validate the received output for JSON parsing.</PRE> Thu, 25 Oct 2018 11:36:41 GMT kubalievzh 2018-10-25T11:36:41Z