Jared Biel created CASSANDRA-12432: -------------------------------------- Summary: Set ulimit for nproc in debian init script Key: CASSANDRA-12432 URL: https://issues.apache.org/jira/browse/CASSANDRA-12432 Project: Cassandra Issue Type: Improvement Reporter: Jared Biel Priority: Minor
While using Cassandra 2.2.7 (installed from official package) on Ubuntu 14.04 I noticed a warning on startup: {noformat} WARN [main] 2016-08-10 21:53:53,219 SigarLibrary.java:174 - Cassandra server running in degraded mode. Is swap disabled? : true, Address space adequate? : true, nofile limit adequate? : true, nproc limit adequate? : false {noformat} I set about researching how that value is set and how to increase it. I found the [Datastax documentation on recommended settings|http://docs.datastax.com/en/landing_page/doc/landing_page/recommendedSettingsLinux.html] and tried to increase the nproc limits according to that doc to no avail. I eventually found a [stackoverflow post|http://superuser.com/questions/454465/make-ulimits-work-with-start-stop-daemon] that states that start-stop-daemon (which the C* init script uses) doesn't/can't use the values specified in the limits.conf files. I solved this by adding a {{ulimit -p 32768}} entry to the init script below the other two ulimit commands. Note the the flag is "-p" for dash (default /bin/sh on Ubuntu), but the flag is "-u" on bash. As Debian has had [dash as default|https://wiki.debian.org/Shell] since squeeze (2011-02-06), this should be safe on most Debian based distros. -- This message was sent by Atlassian JIRA (v6.3.4#6332)