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https://issues.apache.org/jira/browse/CASSANDRA-12432?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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C. Scott Andreas updated CASSANDRA-12432:
-----------------------------------------
Component/s: Packaging
> 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
> Components: Packaging
> 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 that 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.
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