AEN Version 4.x.x
This article addresses an issue when starting the wakari-compute service results in a FATAL ERROR. First you can check the log files to see the error resulting from starting the service. Log files are located at /opt/wakari-wakari-compute/var/log/wakari/, particularly the compute-launcher.application.log.
10 Jan 15:34:49 - Deprecated: Use utils.get_pidfiles() instead FATAL ERROR: CALL_AND_RETRY_0 Allocation failed - process out of memory
This error does not necessarily mean there is a memory or disk space issue. If the above error is given it can be caused by the accumulation of .pid files left over from a possible shutdown of the service that resulted in a failure to cleanup these files. The compute service tries to load these all at once and exceeds the default memory allocation size of the service.
You can delete all of the .pid files and directories located at /opt/wakari/wakari-compute/var/run/compute-launcher-apps/. These files are no longer needed as the processes they were attached to are no longer running. These files will again be created as new processes are started.