CJE Unsupported machine types
Amazon has recently introduced the m5 and c5 machine instance classes. Their storage configuration is different from other m and c class instances, and due to this, CJE does not support them at this time. Starting worker instances with these machine classes will result in CJE failures that prevent jobs from starting properly. Recovery from this will require removing these machine instances from the cluster.
We will be updating CJE in February to support these new instance types. Please install the February 14 release of CJE prior to using c5 and m5 machine instances.