在树莓派运行logstash报错：
See http://jira.codehaus.org/browse/JRUBY-4583
require at org/jruby/RubyKernel.java:1040
require at /var/app/logstash-5.5.0/vendor/bundle/jruby/1.9/gems/polyglot-0.3.5/lib/polyglot.rb:65
(root) at /var/app/logstash-5.5.0/vendor/jruby/lib/ruby/shared/ffi/ffi.rb:69
require at org/jruby/RubyKernel.java:1040
require at /var/app/logstash-5.5.0/vendor/bundle/jruby/1.9/gems/polyglot-0.3.5/lib/polyglot.rb:65
(root) at /var/app/logstash-5.5.0/vendor/jruby/lib/ruby/shared/ffi.rb:1
require at org/jruby/RubyKernel.java:1040
require at /var/app/logstash-5.5.0/vendor/bundle/jruby/1.9/gems/polyglot-0.3.5/lib/polyglot.rb:65
(root) at /var/app/logstash-5.5.0/vendor/jruby/lib/ruby/shared/ffi.rb:1
(root) at /var/app/logstash-5.5.0/logstash-core/lib/logstash/util/prctl.rb:1
require at org/jruby/RubyKernel.java:1040
require at /var/app/logstash-5.5.0/vendor/bundle/jruby/1.9/gems/polyglot-0.3.5/lib/polyglot.rb:65
LibC at /var/app/logstash-5.5.0/logstash-core/lib/logstash/util/prctl.rb:3
(root) at /var/app/logstash-5.5.0/logstash-core/lib/logstash/util/prctl.rb:2
(root) at /var/app/logstash-5.5.0/logstash-core/lib/logstash/util.rb:1
set_thread_name at /var/app/logstash-5.5.0/logstash-core/lib/logstash/util.rb:20
execute at /var/app/logstash-5.5.0/logstash-core/lib/logstash/runner.rb:246
(root) at /var/app/logstash-5.5.0/lib/bootstrap/environment.rb:71
在网上找了下，可能要编译jffi的arm版本
sudo apt-get install ant texinfo
git clo
ne https://github.com/jnr/jffi.gitcd jffi
ant jar
sudo cp /var/app/jffi/build/jni/libjffi-1.2.so /var/app/logstash-5.5.0/vendor/jruby/lib/jni/arm-Linux/
然后在运行logstash，可用了