Error: "Unable to lock JVM memory (ENOMEM)"
Upsource continuously shows "Indexing in progress" for some (all) revisions, or Apache Cassandra database gets restarted on a regular basis. Going through Upsource logs you encounter the following error:
Unable to lock JVM memory (ENOMEM). This can result in part of the JVM being swapped out, especially with mmapped I/O enabled. Increase RLIMIT_MEMLOCK or run Cassandra as root
Too many open files..
Insufficient resource limits may result in this kind of error. To mitigate this, we recommend setting:
maximum open files to 100000
memory locking and address space limit to unlimited
number of processes to 32768
You can do it by adding the following lines to the /etc/security/limits.conf file: