https://community.cloudera.com/t5/Support-Questions/NiFi-node-keeps-disconnecting-from-the-cluster/m-p/191888#M153967 <P><A rel="user" href="https://community.cloudera.com/users/1422/xsanderson.html" nodeid="1422">@Xi Sanderson</A> </P><P>The above log line is not an indication of a problem.</P><P>You can use the jstat command to look at your GC stats:</P><P>For example the following command will print GC stats every 250 ms for 1000 lines:</P><PRE>/&lt;path to Java&gt;/bin/jstat -gcutil &lt;nifi pid&gt; 250 1000</PRE> <TABLE><TBODY><TR><TH>Column</TH><TH>Description</TH></TR><TR><TD>S0</TD><TD>Survivor space 0 utilization as a percentage of the space's current capacity.</TD></TR><TR><TD>S1</TD><TD>Survivor space 1 utilization as a percentage of the space's current capacity.</TD></TR><TR><TD>E</TD><TD>Eden space utilization as a percentage of the space's current capacity.</TD></TR><TR><TD>O</TD><TD>Old space utilization as a percentage of the space's current capacity.</TD></TR><TR><TD>P</TD><TD>Permanent space utilization as a percentage of the space's current capacity.</TD></TR><TR><TD>YGC</TD><TD>Number of young generation GC events.</TD></TR><TR><TD>YGCT</TD><TD>Young generation garbage collection time.</TD></TR><TR><TD><STRONG>FGC</STRONG></TD><TD><STRONG>Number of full GC events.</STRONG></TD></TR><TR><TD><STRONG>FGCT</STRONG></TD><TD><STRONG>Full garbage collection time.</STRONG></TD></TR><TR><TD>GCT</TD><TD>Total garbage collection time.</TD></TR></TBODY></TABLE><P>What version of NiFi and what version of Java are you running?</P><P>Thanks,</P><P>Matt</P> Tue, 30 May 2017 22:34:36 GMT MattWho 2017-05-30T22:34:36Z