Logstash: [meta] JRuby 9k stability

[colinsurprenant]

This is a meta issue to track the JRuby 9k integration stability issues in LS 6.

• [x] JRuby JIT issue jruby/jruby#4739, #7999, #8008, #8030

[headius]

All of these issues appear to be the same things, summarized with a reproduction and possible fixes in jruby/jruby#4739.

[colinsurprenant]

I updated the description to reflect that all issues reported were in fact related to the same JRuby JIT issue and should be solved in upcoming 9.1.13.0.

I was going to suggest we test against a 9.1.13.0 snapshot but I can't find recent nightly builds.

[headius]

Thank you for pointing out the missing 9.1.x snapshots. I believe this is simply an oversight; we're still building two HEAD builds, but it's master and jruby-1_7, not master and jruby-9.1.*. I'll remedy this.

[headius]

The JRuby CI nightlies have been reworked.

The snapshots/current and snapshots/previous dirs now hold the current development line (usually master) and previous maintained version line (currently 9.1.x).

Builds of 9.1.13.0 are available at http://ci.jruby.org/snapshots/previous/.

Builds of 9.2 (master) are available at http://ci.jruby.org/snapshots/current/.

[colinsurprenant]

Thanks @headius - really useful!

[original-brownbear]

fixed thanks to JRuby 9.1.13.0 :)