https://community.cloudera.com/t5/Support-Questions/Error-flush-failed-for-required-journal/m-p/89372#M28500 <P>Hi,</P><P>&nbsp;</P><P>When the NameNode flushes the edits to Journal Nodes it maintains the quorum of 20 seconds. The reason you are seeing this Error message is because it took &gt;20 sec for NN to send the edits. This could be because of various reasons i.e NN GC or JVM pause, whether JN is sharing the disks with other roles, network communication issues , slow group lookups&nbsp; etc.&nbsp;</P><P>&nbsp;</P><P>Checking the NameNode logs just before the FATAL message would be a good starting point. Check for Warning messages just before the FATAL error message on NameNode logs.</P> Sun, 21 Apr 2019 18:42:20 GMT kingpin 2019-04-21T18:42:20Z