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)
