我正在使用 log4j2 和 syslog 附加程序。我使用 TCP 作为协议和 Kiwi 系统日志服务器。发送错误消息时，异常堆栈跟踪通过 TCP 分多行发送，每一行位于一个数据包中。堆栈跟踪的第一行显示 Kiwi syslog 服务器中正确的日志级别，但同一堆栈跟踪的后续行显示错误的日志级别和设施。在 UDP 协议中不会发生这种情况。
01-22-2015 10:25:40 Local0.Error 10.74.224.251 1 2015-01-23T00:20:11.473+05:30 ABC-PC - - [mdc@1000 category="com.test.dataSender" exception="" thread="ForkJoinPool-57-worker-1"] [8ef587c9-5605-42d3-88ff-0d865cf6e510]: Failed to add management service instance 'aa', Cause: aa
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 " thread="ForkJoinPool-57-worker-1"] [8ef587c9-5605-42d3-88ff-0d865cf6e510]: Unknown Host : aa
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:398)
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at java.util.concurrent.ForkJoinPool.work(ForkJoinPool.java:646)
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:784)
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at java.util.concurrent.ForkJoinWorkerThread.execTask(ForkJoinWorkerThread.java:604)
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:334)
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at java.util.concurrent.RecursiveTask.exec(RecursiveTask.java:93)
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at com.test.data.core.mapreduce.MapReduceTask.compute(MapReduceTask.java:26)
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at com.test.data.core.datasource.DatasourceAdder.map(DatasourceAdder.java:21)
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at com.test.data.core.datasource.DatasourceAdder.map(DatasourceAdder.java:70)
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at com.test.data.um.datasource.UMDatasourceService.addDatasources(UMDatasourceService.java:58)
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at com.test.data.um.datasource.UMDatasourceServiceFacadeImpl.addDatasources(UMDatasourceServiceFacadeImpl.java:211)
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at com.test.data.um.datasource.UMDatasourceServiceFacadeImpl.discoverDatasources(UMDatasourceServiceFacadeImpl.java:248)
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at java.net.InetAddress.getByName(InetAddress.java:1048)
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at java.net.InetAddress.getAllByName(InetAddress.java:1098)
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at java.net.InetAddress.getAllByName(InetAddress.java:1162)
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at java.net.InetAddress.getAllByName0(InetAddress.java:1246)
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1293)
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:901)
01-22-2015 10:25:39 Local7.Debug 10.74.224.251 at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
01-22-2015 10:25:39 Local0.Error 10.74.224.251 1 2015-01-23T00:20:11.471+05:30 ABC-PC [OnCommand API Services] - - [mdc@1000 category="com.test.data.um.datasource.UMDatasourceServiceFacadeImpl" exception="java.net.UnknownHostException: aa
另一个问题，关于mdc@1000， 这是什么？为什么要打印这个？我已经添加了includeMDC=true在 log4j2 配置文件中。
<Syslog name="syslogAppender"
host="${sys:syslog.host}" port="${sys:syslog.port}" protocol="${sys:syslog.protocol}"
appName="${serviceName}" enabled="${sys:syslog.enabled}" format="RFC5424"
newLine="true" includeMDC="true" mdcId="mdc" ignoreExceptions="true"
enterpriseNumber="1000">
<LoggerFields>
<KeyValuePair key="thread" value="%t" />
<KeyValuePair key="category" value="%c" />
<KeyValuePair key="exception" value="%ex{full}" />
</LoggerFields>
</Syslog>
None
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