QiuMM commented on issue #6342: Add support for Graylog URL: https://github.com/apache/incubator-druid/pull/6342#issuecomment-422499379 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.
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