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Eric Evans commented on CASSANDRA-3991:
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Java's "platform neutrality" makes it impossible to properly daemonize, jsvc is
meant as a work-around. It disassociates from the controlling terminal,
becomes the session leader, double-forks, sets the PWD to "/", sets the umask
to 0, closes file descriptors, etc, etc.
As Sylvain mentions, it's also supposed to restart when the JVM (not the app)
crashes.
bq. I guess the main point of JSVC is this? "Jsvc allows the application (e.g.
Tomcat) to perform some privileged operations as root (e.g. bind to a port <
1024), and then switch identity to a non-privileged user." We don't even use
that...
We might be opening root-owned files at start-up (we used to anyway).
If jsvc is buggy (is this memory thing the only problem?) the options would
seem to be:
# File a bug report with Debian, commons-daemon, or both
# Fix the jsvc bug(s)
# Try to properly daemonize entirely from shell (I tried doing this with
{{bin/cassandra}} FWIW, I don't think it's practical)
# Rip out jsvc and call it Good Enough(tm)
Looking at the source, jsvc seems pretty simple. I might be willing to take a
crack at bug-fixing in the weeks to come assuming a) I knew how to reproduce
the issue(s), and b) everyone doesn't already have their hearts set on #4.
> Investigate importance of jsvc in debian packages
> -------------------------------------------------
>
> Key: CASSANDRA-3991
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3991
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Brandon Williams
> Assignee: Brandon Williams
> Fix For: 1.1.1
>
>
> jsvc seems to be buggy at best. For instance, if you set a small heap like
> 128M it seems to completely ignore this and use as much memory as it wants.
> I don't know what this is buying us over launching /usr/bin/cassandra
> directly like the redhat scripts do, but I've seen multiple complaints about
> its memory usage.
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