We use Graylog in production to collect logs from different druid nodes. And
UDP is used to send logs to Graylog server, so it makes little hurt to Druid.
However, we encountered a terrible error today when the Graylog server can not
be connected:
```
Exception in thread "main" java.lang.NoSuchMethodError:
org.apache.logging.log4j.Logger.error(Ljava/lang/String;Ljava/lang/Object;Ljava/lang/Object;)V
at
biz.paluch.logging.gelf.log4j2.GelfLogAppender$1.reportError(GelfLogAppender.java:169)
at
biz.paluch.logging.gelf.intern.MessagePostprocessingErrorReporter.reportError(MessagePostprocessingErrorReporter.java:23)
at
biz.paluch.logging.gelf.intern.sender.AbstractNioSender.isConnected(AbstractNioSender.java:79)
at
biz.paluch.logging.gelf.intern.sender.GelfUDPSender.sendDatagrams(GelfUDPSender.java:54)
at
biz.paluch.logging.gelf.intern.sender.GelfUDPSender.sendMessage(GelfUDPSender.java:47)
at
biz.paluch.logging.gelf.log4j2.GelfLogAppender.append(GelfLogAppender.java:344)
at
org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:152)
at
org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:125)
at
org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:116)
at
org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
at
org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:390)
at
org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:378)
at
org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:362)
at
org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:352)
```
Then we found `logstash-gelf 1.12.0` dependent on `log4j 2.9.1` which has some
implementations that `log4j 2.5` does not have (druid use 2.5 version). So we
need to use a lower version of `logstash-gelf`. I'll submit a new commit to fix
this.
[ Full content available at:
https://github.com/apache/incubator-druid/pull/6342 ]
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