报错：
[2019-04-16T15:54:07,827][FATAL][logstash.runner ] An unexpected error occurred! {:error=>#<SystemCallError: Unknown error (SystemCallError) - <STDOUT>>, :backtrace=>["org/jruby/RubyIO.java:1457:in `write'", "org/jruby/RubyIO.java:1428:in `write'", "/home/dgd/bin/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-output-stdout-3.1.4/lib/logstash/outputs/stdout.rb:43:in `block in multi_receive_encoded'", "org/jruby/RubyArray.java:1734:in `each'", "/home/dgd/bin/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-output-stdout-3.1.4/lib/logstash/outputs/stdout.rb:42:in `multi_receive_encoded'", "/home/dgd/bin/logstash/logstash-core/lib/logstash/outputs/base.rb:87:in `multi_receive'", "org/logstash/config/ir/compiler/OutputStrategyExt.java:114:in `multi_receive'", "org/logstash/config/ir/compiler/AbstractOutputDelegatorExt.java:97:in `multi_receive'", "/home/dgd/bin/logstash/logstash-core/lib/logstash/pipeline.rb:373:in `block in output_batch'", "org/jruby/RubyHash.java:1343:in `each'", "/home/dgd/bin/logstash/logstash-core/lib/logstash/pipeline.rb:372:in `output_batch'", "/home/dgd/bin/logstash/logstash-core/lib/logstash/pipeline.rb:324:in `worker_loop'", "/home/dgd/bin/logstash/logstash-core/lib/logstash/pipeline.rb:286:in `block in start_workers'"]}
[2019-04-16T15:54:07,893][ERROR][org.logstash.Logstash ] java.lang.IllegalStateException: Logstash stopped processing because of an error: (SystemExit) exit
解决方法：
vim pipeline-config/xxx.config
....
output {
# stdout { codec => rubydebug } //将这行备注掉
....