KafkaAppender
log4j-core-2.7-sources.jar!/org/apache/logging/log4j/core/appender/mom/kafka/KafkaAppender.java
public void append(final LogEvent event) {
if (event.getLoggerName().startsWith("org.apache.kafka")) {
LOGGER.warn("Recursive logging from [{}] for appender [{}].", event.getLoggerName(), getName());
} else {
try {
final Layout<? extends Serializable> layout = getLayout();
byte[] data;
if (layout != null) {
if (layout instanceof SerializedLayout) {
final byte[] header = layout.getHeader();
final byte[] body = layout.toByteArray(event);
data = new byte[header.length + body.length];
System.arraycopy(header, 0, data, 0, header.length);
System.arraycopy(body, 0, data, header.length, body.length);
} else {
data = layout.toByteArray(event);
}
} else {
data = StringEncoder.toBytes(event.getMessage().getFormattedMessage(), StandardCharsets.UTF_8);
}
manager.send(data);
} catch (final Exception e) {
LOGGER.error("Unable to write to Kafka [{}] for appender [{}].", manager.getName(), getName(), e);
throw new AppenderLoggingException("Unable to write to Kafka in appender: " + e.getMessage(), e);
}
}
}JsonLayout的话，是走data = layout.toByteArray(event);这一步，而toByteArray是调用
log4j-core-2.7-sources.jar!/org/apache/logging/log4j/core/layout/AbstractStringLayout.java
/**
* Formats the Log Event as a byte array.
*
* @param event The Log Event.
* @return The formatted event as a byte array.
*/
@Override
public byte[] toByteArray(final LogEvent event) {
return getBytes(toSerializable(event));
}
protected byte[] getBytes(final String s) {
if (useCustomEncoding) { // rely on branch prediction to eliminate this check if false
return StringEncoder.encodeSingleByteChars(s);
}
try { // LOG4J2-935: String.getBytes(String) gives better performance
return s.getBytes(charsetName);
} catch (final UnsupportedEncodingException e) {
return s.getBytes(charset);
}
}toSerializable是调用
log4j-core-2.7-sources.jar!/org/apache/logging/log4j/core/layout/AbstractJacksonLayout.java
@Override
public String toSerializable(final LogEvent event) {
final StringBuilderWriter writer = new StringBuilderWriter();
try {
toSerializable(event, writer);
return writer.toString();
} catch (final IOException e) {
// Should this be an ISE or IAE?
LOGGER.error(e);
return Strings.EMPTY;
}
}
public void toSerializable(final LogEvent event, final Writer writer)
throws JsonGenerationException, JsonMappingException, IOException {
objectWriter.writeValue(writer, convertMutableToLog4jEvent(event));
writer.write(eol);
markEvent();
}
private static LogEvent convertMutableToLog4jEvent(final LogEvent event) {
// TODO Jackson-based layouts have certain filters set up for Log4jLogEvent.
// TODO Need to set up the same filters for MutableLogEvent but don't know how...
// This is a workaround.
return event instanceof MutableLogEvent
? ((MutableLogEvent) event).createMemento()
: event;
}json实例
{
"timeMillis": 1508045813249,
"thread": "http-nio-8080-exec-1",
"level": "ERROR",
"loggerName": "com.example.demo.controller.ErrorController",
"message": "/ by zero",
"thrown": {
"commonElementCount": 0,
"localizedMessage": "/ by zero",
"message": "/ by zero",
"name": "java.lang.ArithmeticException",
"extendedStackTrace": [
{
"class": "com.example.demo.controller.ErrorController",
"method": "logError",
"file": "ErrorController.java",
"line": 20,
"exact": true,
"location": "classes/",
"version": "?"
},
{
"class": "sun.reflect.NativeMethodAccessorImpl",
"method": "invoke0",
"file": "NativeMethodAccessorImpl.java",
"line": -2,
"exact": false,
"location": "?",
"version": "1.8.0_71"
},
{
"class": "sun.reflect.NativeMethodAccessorImpl",
"method": "invoke",
"file": "NativeMethodAccessorImpl.java",
"line": 62,
"exact": false,
"location": "?",
"version": "1.8.0_71"
},
{
"class": "sun.reflect.DelegatingMethodAccessorImpl",
"method": "invoke",
"file": "DelegatingMethodAccessorImpl.java",
"line": 43,
"exact": false,
"location": "?",
"version": "1.8.0_71"
},
{
"class": "java.lang.reflect.Method",
"method": "invoke",
"file": "Method.java",
"line": 497,
"exact": false,
"location": "?",
"version": "1.8.0_71"
},
{
"class": "org.springframework.web.method.support.InvocableHandlerMethod",
"method": "doInvoke",
"file": "InvocableHandlerMethod.java",
"line": 205,
"exact": true,
"location": "spring-web-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.springframework.web.method.support.InvocableHandlerMethod",
"method": "invokeForRequest",
"file": "InvocableHandlerMethod.java",
"line": 133,
"exact": true,
"location": "spring-web-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod",
"method": "invokeAndHandle",
"file": "ServletInvocableHandlerMethod.java",
"line": 97,
"exact": true,
"location": "spring-webmvc-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter",
"method": "invokeHandlerMethod",
"file": "RequestMappingHandlerAdapter.java",
"line": 827,
"exact": true,
"location": "spring-webmvc-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter",
"method": "handleInternal",
"file": "RequestMappingHandlerAdapter.java",
"line": 738,
"exact": true,
"location": "spring-webmvc-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter",
"method": "handle",
"file": "AbstractHandlerMethodAdapter.java",
"line": 85,
"exact": true,
"location": "spring-webmvc-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.springframework.web.servlet.DispatcherServlet",
"method": "doDispatch",
"file": "DispatcherServlet.java",
"line": 967,
"exact": true,
"location": "spring-webmvc-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.springframework.web.servlet.DispatcherServlet",
"method": "doService",
"file": "DispatcherServlet.java",
"line": 901,
"exact": true,
"location": "spring-webmvc-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.springframework.web.servlet.FrameworkServlet",
"method": "processRequest",
"file": "FrameworkServlet.java",
"line": 970,
"exact": true,
"location": "spring-webmvc-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.springframework.web.servlet.FrameworkServlet",
"method": "doGet",
"file": "FrameworkServlet.java",
"line": 861,
"exact": true,
"location": "spring-webmvc-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "javax.servlet.http.HttpServlet",
"method": "service",
"file": "HttpServlet.java",
"line": 635,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.springframework.web.servlet.FrameworkServlet",
"method": "service",
"file": "FrameworkServlet.java",
"line": 846,
"exact": true,
"location": "spring-webmvc-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "javax.servlet.http.HttpServlet",
"method": "service",
"file": "HttpServlet.java",
"line": 742,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.catalina.core.ApplicationFilterChain",
"method": "internalDoFilter",
"file": "ApplicationFilterChain.java",
"line": 231,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.catalina.core.ApplicationFilterChain",
"method": "doFilter",
"file": "ApplicationFilterChain.java",
"line": 166,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.tomcat.websocket.server.WsFilter",
"method": "doFilter",
"file": "WsFilter.java",
"line": 52,
"exact": true,
"location": "tomcat-embed-websocket-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.catalina.core.ApplicationFilterChain",
"method": "internalDoFilter",
"file": "ApplicationFilterChain.java",
"line": 193,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.catalina.core.ApplicationFilterChain",
"method": "doFilter",
"file": "ApplicationFilterChain.java",
"line": 166,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.springframework.boot.web.filter.ApplicationContextHeaderFilter",
"method": "doFilterInternal",
"file": "ApplicationContextHeaderFilter.java",
"line": 55,
"exact": true,
"location": "spring-boot-1.5.7.RELEASE.jar",
"version": "1.5.7.RELEASE"
},
{
"class": "org.springframework.web.filter.OncePerRequestFilter",
"method": "doFilter",
"file": "OncePerRequestFilter.java",
"line": 107,
"exact": true,
"location": "spring-web-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.apache.catalina.core.ApplicationFilterChain",
"method": "internalDoFilter",
"file": "ApplicationFilterChain.java",
"line": 193,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.catalina.core.ApplicationFilterChain",
"method": "doFilter",
"file": "ApplicationFilterChain.java",
"line": 166,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.springframework.boot.actuate.trace.WebRequestTraceFilter",
"method": "doFilterInternal",
"file": "WebRequestTraceFilter.java",
"line": 110,
"exact": true,
"location": "spring-boot-actuator-1.5.7.RELEASE.jar",
"version": "1.5.7.RELEASE"
},
{
"class": "org.springframework.web.filter.OncePerRequestFilter",
"method": "doFilter",
"file": "OncePerRequestFilter.java",
"line": 107,
"exact": true,
"location": "spring-web-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.apache.catalina.core.ApplicationFilterChain",
"method": "internalDoFilter",
"file": "ApplicationFilterChain.java",
"line": 193,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.catalina.core.ApplicationFilterChain",
"method": "doFilter",
"file": "ApplicationFilterChain.java",
"line": 166,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.springframework.web.filter.RequestContextFilter",
"method": "doFilterInternal",
"file": "RequestContextFilter.java",
"line": 99,
"exact": true,
"location": "spring-web-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.springframework.web.filter.OncePerRequestFilter",
"method": "doFilter",
"file": "OncePerRequestFilter.java",
"line": 107,
"exact": true,
"location": "spring-web-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.apache.catalina.core.ApplicationFilterChain",
"method": "internalDoFilter",
"file": "ApplicationFilterChain.java",
"line": 193,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.catalina.core.ApplicationFilterChain",
"method": "doFilter",
"file": "ApplicationFilterChain.java",
"line": 166,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.springframework.web.filter.HttpPutFormContentFilter",
"method": "doFilterInternal",
"file": "HttpPutFormContentFilter.java",
"line": 108,
"exact": true,
"location": "spring-web-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.springframework.web.filter.OncePerRequestFilter",
"method": "doFilter",
"file": "OncePerRequestFilter.java",
"line": 107,
"exact": true,
"location": "spring-web-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.apache.catalina.core.ApplicationFilterChain",
"method": "internalDoFilter",
"file": "ApplicationFilterChain.java",
"line": 193,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.catalina.core.ApplicationFilterChain",
"method": "doFilter",
"file": "ApplicationFilterChain.java",
"line": 166,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.springframework.web.filter.HiddenHttpMethodFilter",
"method": "doFilterInternal",
"file": "HiddenHttpMethodFilter.java",
"line": 81,
"exact": true,
"location": "spring-web-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.springframework.web.filter.OncePerRequestFilter",
"method": "doFilter",
"file": "OncePerRequestFilter.java",
"line": 107,
"exact": true,
"location": "spring-web-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.apache.catalina.core.ApplicationFilterChain",
"method": "internalDoFilter",
"file": "ApplicationFilterChain.java",
"line": 193,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.catalina.core.ApplicationFilterChain",
"method": "doFilter",
"file": "ApplicationFilterChain.java",
"line": 166,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.springframework.web.filter.CharacterEncodingFilter",
"method": "doFilterInternal",
"file": "CharacterEncodingFilter.java",
"line": 197,
"exact": true,
"location": "spring-web-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.springframework.web.filter.OncePerRequestFilter",
"method": "doFilter",
"file": "OncePerRequestFilter.java",
"line": 107,
"exact": true,
"location": "spring-web-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.apache.catalina.core.ApplicationFilterChain",
"method": "internalDoFilter",
"file": "ApplicationFilterChain.java",
"line": 193,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.catalina.core.ApplicationFilterChain",
"method": "doFilter",
"file": "ApplicationFilterChain.java",
"line": 166,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.springframework.boot.actuate.autoconfigure.MetricsFilter",
"method": "doFilterInternal",
"file": "MetricsFilter.java",
"line": 106,
"exact": true,
"location": "spring-boot-actuator-1.5.7.RELEASE.jar",
"version": "1.5.7.RELEASE"
},
{
"class": "org.springframework.web.filter.OncePerRequestFilter",
"method": "doFilter",
"file": "OncePerRequestFilter.java",
"line": 107,
"exact": true,
"location": "spring-web-4.3.11.RELEASE.jar",
"version": "4.3.11.RELEASE"
},
{
"class": "org.apache.catalina.core.ApplicationFilterChain",
"method": "internalDoFilter",
"file": "ApplicationFilterChain.java",
"line": 193,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.catalina.core.ApplicationFilterChain",
"method": "doFilter",
"file": "ApplicationFilterChain.java",
"line": 166,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.catalina.core.StandardWrapperValve",
"method": "invoke",
"file": "StandardWrapperValve.java",
"line": 198,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.catalina.core.StandardContextValve",
"method": "invoke",
"file": "StandardContextValve.java",
"line": 96,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.catalina.authenticator.AuthenticatorBase",
"method": "invoke",
"file": "AuthenticatorBase.java",
"line": 478,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.catalina.core.StandardHostValve",
"method": "invoke",
"file": "StandardHostValve.java",
"line": 140,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.catalina.valves.ErrorReportValve",
"method": "invoke",
"file": "ErrorReportValve.java",
"line": 80,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.catalina.core.StandardEngineValve",
"method": "invoke",
"file": "StandardEngineValve.java",
"line": 87,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.catalina.connector.CoyoteAdapter",
"method": "service",
"file": "CoyoteAdapter.java",
"line": 342,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.coyote.http11.Http11Processor",
"method": "service",
"file": "Http11Processor.java",
"line": 799,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.coyote.AbstractProcessorLight",
"method": "process",
"file": "AbstractProcessorLight.java",
"line": 66,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.coyote.AbstractProtocol$ConnectionHandler",
"method": "process",
"file": "AbstractProtocol.java",
"line": 868,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.tomcat.util.net.NioEndpoint$SocketProcessor",
"method": "doRun",
"file": "NioEndpoint.java",
"line": 1457,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "org.apache.tomcat.util.net.SocketProcessorBase",
"method": "run",
"file": "SocketProcessorBase.java",
"line": 49,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "java.util.concurrent.ThreadPoolExecutor",
"method": "runWorker",
"file": "ThreadPoolExecutor.java",
"line": 1142,
"exact": true,
"location": "?",
"version": "1.8.0_71"
},
{
"class": "java.util.concurrent.ThreadPoolExecutor$Worker",
"method": "run",
"file": "ThreadPoolExecutor.java",
"line": 617,
"exact": true,
"location": "?",
"version": "1.8.0_71"
},
{
"class": "org.apache.tomcat.util.threads.TaskThread$WrappingRunnable",
"method": "run",
"file": "TaskThread.java",
"line": 61,
"exact": true,
"location": "tomcat-embed-core-8.5.20.jar",
"version": "8.5.20"
},
{
"class": "java.lang.Thread",
"method": "run",
"file": "Thread.java",
"line": 745,
"exact": true,
"location": "?",
"version": "1.8.0_71"
}
]
},
"endOfBatch": false,
"loggerFqcn": "org.apache.logging.slf4j.Log4jLogger",
"threadId": 26,
"threadPriority": 5
}可以配置SerializedLayout或者PatternLayout，但是这两种兼容性不如json好，前者是基于jdk的序列化，在log4j的2.9版本被废弃了，不建议使用；而PatternLayout则受限于layout，不同的应用如果定义不同的PatternLayout，则解析旧程序就得相应修改。
如果觉得json传输文本太长，可以压缩一下或者基于pb，自己扩展定义一个layout
解析json
在kafka的消费端去解析json的话，使用ObjectMapper来解析的话，
Log4jLogEvent logEvent = mapper.readValue(value,Log4jLogEvent.class);则报错
com.fasterxml.jackson.databind.JsonMappingException: Can not find a deserializer for non-concrete Collection type [collection type; class org.apache.logging.log4j.ThreadContext$ContextStack, contains [simple type, class java.lang.String]]
at [Source: {"timeMillis":1508047984078,"thread":"http-nio-8080-exec-6","level":"ERROR","loggerName":"com.example.demo.controller.ErrorController","message":"/ by zero","thrown":{"commonElementCount":0,"localizedMessage":"/ by zero","message":"/ by zero","name":"java.lang.ArithmeticException","extendedStackTrace":[{"class":"com.example.demo.controller.ErrorController","method":"logError","file":"ErrorController.java","line":20,"exact":true,"location":"classes/","version":"?"},{"class":"sun.reflect.NativeMethodAccessorImpl","method":"invoke0","file":"NativeMethodAccessorImpl.java","line":-2,"exact":false,"location":"?","version":"1.8.0_71"},{"class":"sun.reflect.NativeMethodAccessorImpl","method":"invoke","file":"NativeMethodAccessorImpl.java","line":62,"exact":false,"location":"?","version":"1.8.0_71"},{"class":"sun.reflect.DelegatingMethodAccessorImpl","method":"invoke","file":"DelegatingMethodAccessorImpl.java","line":43,"exact":false,"location":"?","version":"1.8.0_71"},{"class":"java.lang.reflect.Method","method":"invoke","file":"Method.java","line":497,"exact":false,"location":"?","version":"1.8.0_71"},{"class":"org.springframework.web.method.support.InvocableHandlerMethod","method":"doInvoke","file":"InvocableHandlerMethod.java","line":205,"exact":true,"location":"spring-web-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.springframework.web.method.support.InvocableHandlerMethod","method":"invokeForRequest","file":"InvocableHandlerMethod.java","line":133,"exact":true,"location":"spring-web-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod","method":"invokeAndHandle","file":"ServletInvocableHandlerMethod.java","line":97,"exact":true,"location":"spring-webmvc-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter","method":"invokeHandlerMethod","file":"RequestMappingHandlerAdapter.java","line":827,"exact":true,"location":"spring-webmvc-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter","method":"handleInternal","file":"RequestMappingHandlerAdapter.java","line":738,"exact":true,"location":"spring-webmvc-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter","method":"handle","file":"AbstractHandlerMethodAdapter.java","line":85,"exact":true,"location":"spring-webmvc-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.springframework.web.servlet.DispatcherServlet","method":"doDispatch","file":"DispatcherServlet.java","line":967,"exact":true,"location":"spring-webmvc-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.springframework.web.servlet.DispatcherServlet","method":"doService","file":"DispatcherServlet.java","line":901,"exact":true,"location":"spring-webmvc-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.springframework.web.servlet.FrameworkServlet","method":"processRequest","file":"FrameworkServlet.java","line":970,"exact":true,"location":"spring-webmvc-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.springframework.web.servlet.FrameworkServlet","method":"doGet","file":"FrameworkServlet.java","line":861,"exact":true,"location":"spring-webmvc-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"javax.servlet.http.HttpServlet","method":"service","file":"HttpServlet.java","line":635,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.springframework.web.servlet.FrameworkServlet","method":"service","file":"FrameworkServlet.java","line":846,"exact":true,"location":"spring-webmvc-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"javax.servlet.http.HttpServlet","method":"service","file":"HttpServlet.java","line":742,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.catalina.core.ApplicationFilterChain","method":"internalDoFilter","file":"ApplicationFilterChain.java","line":231,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.catalina.core.ApplicationFilterChain","method":"doFilter","file":"ApplicationFilterChain.java","line":166,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.tomcat.websocket.server.WsFilter","method":"doFilter","file":"WsFilter.java","line":52,"exact":true,"location":"tomcat-embed-websocket-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.catalina.core.ApplicationFilterChain","method":"internalDoFilter","file":"ApplicationFilterChain.java","line":193,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.catalina.core.ApplicationFilterChain","method":"doFilter","file":"ApplicationFilterChain.java","line":166,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.springframework.boot.web.filter.ApplicationContextHeaderFilter","method":"doFilterInternal","file":"ApplicationContextHeaderFilter.java","line":55,"exact":true,"location":"spring-boot-1.5.7.RELEASE.jar","version":"1.5.7.RELEASE"},{"class":"org.springframework.web.filter.OncePerRequestFilter","method":"doFilter","file":"OncePerRequestFilter.java","line":107,"exact":true,"location":"spring-web-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.apache.catalina.core.ApplicationFilterChain","method":"internalDoFilter","file":"ApplicationFilterChain.java","line":193,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.catalina.core.ApplicationFilterChain","method":"doFilter","file":"ApplicationFilterChain.java","line":166,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.springframework.boot.actuate.trace.WebRequestTraceFilter","method":"doFilterInternal","file":"WebRequestTraceFilter.java","line":110,"exact":true,"location":"spring-boot-actuator-1.5.7.RELEASE.jar","version":"1.5.7.RELEASE"},{"class":"org.springframework.web.filter.OncePerRequestFilter","method":"doFilter","file":"OncePerRequestFilter.java","line":107,"exact":true,"location":"spring-web-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.apache.catalina.core.ApplicationFilterChain","method":"internalDoFilter","file":"ApplicationFilterChain.java","line":193,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.catalina.core.ApplicationFilterChain","method":"doFilter","file":"ApplicationFilterChain.java","line":166,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.springframework.web.filter.RequestContextFilter","method":"doFilterInternal","file":"RequestContextFilter.java","line":99,"exact":true,"location":"spring-web-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.springframework.web.filter.OncePerRequestFilter","method":"doFilter","file":"OncePerRequestFilter.java","line":107,"exact":true,"location":"spring-web-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.apache.catalina.core.ApplicationFilterChain","method":"internalDoFilter","file":"ApplicationFilterChain.java","line":193,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.catalina.core.ApplicationFilterChain","method":"doFilter","file":"ApplicationFilterChain.java","line":166,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.springframework.web.filter.HttpPutFormContentFilter","method":"doFilterInternal","file":"HttpPutFormContentFilter.java","line":108,"exact":true,"location":"spring-web-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.springframework.web.filter.OncePerRequestFilter","method":"doFilter","file":"OncePerRequestFilter.java","line":107,"exact":true,"location":"spring-web-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.apache.catalina.core.ApplicationFilterChain","method":"internalDoFilter","file":"ApplicationFilterChain.java","line":193,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.catalina.core.ApplicationFilterChain","method":"doFilter","file":"ApplicationFilterChain.java","line":166,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.springframework.web.filter.HiddenHttpMethodFilter","method":"doFilterInternal","file":"HiddenHttpMethodFilter.java","line":81,"exact":true,"location":"spring-web-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.springframework.web.filter.OncePerRequestFilter","method":"doFilter","file":"OncePerRequestFilter.java","line":107,"exact":true,"location":"spring-web-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.apache.catalina.core.ApplicationFilterChain","method":"internalDoFilter","file":"ApplicationFilterChain.java","line":193,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.catalina.core.ApplicationFilterChain","method":"doFilter","file":"ApplicationFilterChain.java","line":166,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.springframework.web.filter.CharacterEncodingFilter","method":"doFilterInternal","file":"CharacterEncodingFilter.java","line":197,"exact":true,"location":"spring-web-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.springframework.web.filter.OncePerRequestFilter","method":"doFilter","file":"OncePerRequestFilter.java","line":107,"exact":true,"location":"spring-web-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.apache.catalina.core.ApplicationFilterChain","method":"internalDoFilter","file":"ApplicationFilterChain.java","line":193,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.catalina.core.ApplicationFilterChain","method":"doFilter","file":"ApplicationFilterChain.java","line":166,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.springframework.boot.actuate.autoconfigure.MetricsFilter","method":"doFilterInternal","file":"MetricsFilter.java","line":106,"exact":true,"location":"spring-boot-actuator-1.5.7.RELEASE.jar","version":"1.5.7.RELEASE"},{"class":"org.springframework.web.filter.OncePerRequestFilter","method":"doFilter","file":"OncePerRequestFilter.java","line":107,"exact":true,"location":"spring-web-4.3.11.RELEASE.jar","version":"4.3.11.RELEASE"},{"class":"org.apache.catalina.core.ApplicationFilterChain","method":"internalDoFilter","file":"ApplicationFilterChain.java","line":193,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.catalina.core.ApplicationFilterChain","method":"doFilter","file":"ApplicationFilterChain.java","line":166,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.catalina.core.StandardWrapperValve","method":"invoke","file":"StandardWrapperValve.java","line":198,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.catalina.core.StandardContextValve","method":"invoke","file":"StandardContextValve.java","line":96,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.catalina.authenticator.AuthenticatorBase","method":"invoke","file":"AuthenticatorBase.java","line":478,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.catalina.core.StandardHostValve","method":"invoke","file":"StandardHostValve.java","line":140,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.catalina.valves.ErrorReportValve","method":"invoke","file":"ErrorReportValve.java","line":80,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.catalina.core.StandardEngineValve","method":"invoke","file":"StandardEngineValve.java","line":87,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.catalina.connector.CoyoteAdapter","method":"service","file":"CoyoteAdapter.java","line":342,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.coyote.http11.Http11Processor","method":"service","file":"Http11Processor.java","line":799,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.coyote.AbstractProcessorLight","method":"process","file":"AbstractProcessorLight.java","line":66,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.coyote.AbstractProtocol$ConnectionHandler","method":"process","file":"AbstractProtocol.java","line":868,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.tomcat.util.net.NioEndpoint$SocketProcessor","method":"doRun","file":"NioEndpoint.java","line":1457,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"org.apache.tomcat.util.net.SocketProcessorBase","method":"run","file":"SocketProcessorBase.java","line":49,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"java.util.concurrent.ThreadPoolExecutor","method":"runWorker","file":"ThreadPoolExecutor.java","line":1142,"exact":true,"location":"?","version":"1.8.0_71"},{"class":"java.util.concurrent.ThreadPoolExecutor$Worker","method":"run","file":"ThreadPoolExecutor.java","line":617,"exact":true,"location":"?","version":"1.8.0_71"},{"class":"org.apache.tomcat.util.threads.TaskThread$WrappingRunnable","method":"run","file":"TaskThread.java","line":61,"exact":true,"location":"tomcat-embed-core-8.5.20.jar","version":"8.5.20"},{"class":"java.lang.Thread","method":"run","file":"Thread.java","line":745,"exact":true,"location":"?","version":"1.8.0_71"}]},"endOfBatch":false,"loggerFqcn":"org.apache.logging.slf4j.Log4jLogger","contextMap":{},"threadId":31,"threadPriority":5,"source":{"class":"com.example.demo.controller.ErrorController","method":"logError","file":"ErrorController.java","line":22}}
; line: 1, column: 1]
at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:305)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:268)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:244)
at com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:142)
at com.fasterxml.jackson.databind.DeserializationContext.findNonContextualValueDeserializer(DeserializationContext.java:466)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.resolve(BeanDeserializerBase.java:479)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:293)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:244)
at com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:142)
at com.fasterxml.jackson.databind.DeserializationContext.findRootValueDeserializer(DeserializationContext.java:476)
at com.fasterxml.jackson.databind.ObjectMapper._findRootDeserializer(ObjectMapper.java:3915)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3810)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2858)
at com.example.demo.KafkaLog4jDemoApplicationTests.lambda$consumeErrorLog$0(KafkaLog4jDemoApplicationTests.java:54)
at java.lang.Iterable.forEach(Iterable.java:75)
at com.example.demo.KafkaLog4jDemoApplicationTests.consumeErrorLog(KafkaLog4jDemoApplicationTests.java:47)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
Caused by: java.lang.IllegalArgumentException: Can not find a deserializer for non-concrete Collection type [collection type; class org.apache.logging.log4j.ThreadContext$ContextStack, contains [simple type, class java.lang.String]]
at com.fasterxml.jackson.databind.deser.BasicDeserializerFactory.createCollectionDeserializer(BasicDeserializerFactory.java:1021)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer2(DeserializerCache.java:391)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createDeserializer(DeserializerCache.java:349)
at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:264)
... 46 more因此建议自定义一个bean来解析对应的json，或者基于JSONObject来解析即可。
Log4jLogEventJson
public class Log4jLogEventJson {
private long timeMillis;
private String thread;
private String level;
private String loggerName;
private String message;
private Thrown thrown;
static class Thrown {
private int commonElementCount;
private String localizedMessage;
private String message;
private String name;
@JSONField(name = "extendedStackTrace")
private List<ExtendedStackTrace> extendedStackTraces;
private boolean endOfBatch;
private String loggerFqcn;
private JSONObject contextMap;
private int threadid;
private int threadPriority;
private Source source;
public int getCommonElementCount() {
return commonElementCount;
}
public void setCommonElementCount(int commonElementCount) {
this.commonElementCount = commonElementCount;
}
public String getLocalizedMessage() {
return localizedMessage;
}
public void setLocalizedMessage(String localizedMessage) {
this.localizedMessage = localizedMessage;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<ExtendedStackTrace> getExtendedStackTraces() {
return extendedStackTraces;
}
public void setExtendedStackTraces(List<ExtendedStackTrace> extendedStackTraces) {
this.extendedStackTraces = extendedStackTraces;
}
public boolean isEndOfBatch() {
return endOfBatch;
}
public void setEndOfBatch(boolean endOfBatch) {
this.endOfBatch = endOfBatch;
}
public String getLoggerFqcn() {
return loggerFqcn;
}
public void setLoggerFqcn(String loggerFqcn) {
this.loggerFqcn = loggerFqcn;
}
public JSONObject getContextMap() {
return contextMap;
}
public void setContextMap(JSONObject contextMap) {
this.contextMap = contextMap;
}
public int getThreadid() {
return threadid;
}
public void setThreadid(int threadid) {
this.threadid = threadid;
}
public int getThreadPriority() {
return threadPriority;
}
public void setThreadPriority(int threadPriority) {
this.threadPriority = threadPriority;
}
public Source getSource() {
return source;
}
public void setSource(Source source) {
this.source = source;
}
}
static class ExtendedStackTrace {
@JSONField(name ="class")
private String clz;
private String method;
private String file;
private int line;
private boolean exact;
private String location;
private String version;
public String getClz() {
return clz;
}
public void setClz(String clz) {
this.clz = clz;
}
public String getMethod() {
return method;
}
public void setMethod(String method) {
this.method = method;
}
public String getFile() {
return file;
}
public void setFile(String file) {
this.file = file;
}
public int getLine() {
return line;
}
public void setLine(int line) {
this.line = line;
}
public boolean isExact() {
return exact;
}
public void setExact(boolean exact) {
this.exact = exact;
}
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
public String getVersion() {
return version;
}
public void setVersion(String version) {
this.version = version;
}
}
static class Source {
@JSONField(name = "class")
private String clz;
private String method;
private String file;
private int line;
public String getClz() {
return clz;
}
public void setClz(String clz) {
this.clz = clz;
}
public String getMethod() {
return method;
}
public void setMethod(String method) {
this.method = method;
}
public String getFile() {
return file;
}
public void setFile(String file) {
this.file = file;
}
public int getLine() {
return line;
}
public void setLine(int line) {
this.line = line;
}
}
public String stacktrace(){
if(thrown == null){
return "";
}
StringBuilder builder = new StringBuilder();
builder.append(thrown.getName());
builder.append(": ");
builder.append(thrown.getMessage());
builder.append("\n");
if(thrown.getExtendedStackTraces() == null){
return builder.toString();
}
thrown.getExtendedStackTraces().stream().forEach(e -> {
builder.append(" at ");
builder.append(e.getClz());
builder.append(".");
builder.append(e.getMethod());
builder.append("(");
builder.append(e.getFile());
builder.append(":");
builder.append(e.getLine());
builder.append(")");
if(e.isExact()){
builder.append(" [");
}else{
builder.append(" ~[");
}
builder.append(e.getLocation());
builder.append(":");
builder.append(e.getVersion());
builder.append("]");
builder.append("\n");
});
return builder.toString();
}
public long getTimeMillis() {
return timeMillis;
}
public void setTimeMillis(long timeMillis) {
this.timeMillis = timeMillis;
}
public String getThread() {
return thread;
}
public void setThread(String thread) {
this.thread = thread;
}
public String getLevel() {
return level;
}
public void setLevel(String level) {
this.level = level;
}
public String getLoggerName() {
return loggerName;
}
public void setLoggerName(String loggerName) {
this.loggerName = loggerName;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public Thrown getThrown() {
return thrown;
}
public void setThrown(Thrown thrown) {
this.thrown = thrown;
}
@Override
public String toString() {
return JSON.toJSONString(this);
}
}流式聚合
KStreamBuilder builder = new KStreamBuilder();
KStream<String, String> source = builder.stream("error-log");
KStream<String, Log4jLogEventJson> beanStream = source.map(new KeyValueMapper<String, String, KeyValue<String, Log4jLogEventJson>>() {
@Override
public KeyValue<String, Log4jLogEventJson> apply(String key, String value) {
Log4jLogEventJson bean = JSON.parseObject(value,Log4jLogEventJson.class);
return new KeyValue<>(bean.getLoggerName(), bean);
}
});
GenericJsonSerde<ErrorLogStats> statsGenericJsonSerde = new GenericJsonSerde<>(ErrorLogStats.class);
GenericJsonSerde<Log4jLogEventJson> log4jLogEventJsonGenericJsonSerde = new GenericJsonSerde<>(Log4jLogEventJson.class);
beanStream.groupByKey(Serdes.String(),log4jLogEventJsonGenericJsonSerde)
.aggregate(ErrorLogStats::new,
(key, value, stats) -> {
System.out.println("key:"+key.getClass());
System.out.println("value:"+value.getClass());
return stats.add(value);
},
TimeWindows.of(10000).advanceBy(10000),
statsGenericJsonSerde,
"aggregate")
.foreach((k,v) -> {
LOGGER.info("key:{},start:{},end:{},value:{}",k.key(),k.window().start(),k.window().end(),v.errors.size());
//这里进行报警即可
});输出日志实例
2017-10-15 17:44:19 [StreamThread-1] (StreamThread.java:767) - stream-thread [StreamThread-1] Committing all tasks because the commit interval 10000ms has elapsed
2017-10-15 17:44:19 [StreamThread-1] (StreamThread.java:805) - stream-thread [StreamThread-1] Committing task StreamTask 0_0
2017-10-15 17:44:19 [StreamThread-1] (StreamThread.java:805) - stream-thread [StreamThread-1] Committing task StreamTask 0_1
2017-10-15 17:44:19 [StreamThread-1] (StreamThread.java:805) - stream-thread [StreamThread-1] Committing task StreamTask 1_0
2017-10-15 17:44:19 [StreamThread-1] (StreamThread.java:805) - stream-thread [StreamThread-1] Committing task StreamTask 0_2
2017-10-15 17:44:19 [StreamThread-1] (StreamThread.java:805) - stream-thread [StreamThread-1] Committing task StreamTask 1_1
2017-10-15 17:44:19 [StreamThread-1] (StreamThread.java:805) - stream-thread [StreamThread-1] Committing task StreamTask 1_2
key:class java.lang.String
value:class com.example.demo.Log4jLogEventJson
key:class java.lang.String
value:class com.example.demo.Log4jLogEventJson
key:class java.lang.String
value:class com.example.demo.Log4jLogEventJson
key:class java.lang.String
value:class com.example.demo.Log4jLogEventJson
2017-10-15 17:44:29 [StreamThread-1] (StreamThread.java:767) - stream-thread [StreamThread-1] Committing all tasks because the commit interval 10000ms has elapsed
2017-10-15 17:44:29 [StreamThread-1] (StreamThread.java:805) - stream-thread [StreamThread-1] Committing task StreamTask 0_0
2017-10-15 17:44:29 [StreamThread-1] (StreamThread.java:805) - stream-thread [StreamThread-1] Committing task StreamTask 0_1
2017-10-15 17:44:29 [StreamThread-1] (StreamThread.java:805) - stream-thread [StreamThread-1] Committing task StreamTask 1_0
2017-10-15 17:44:29 [StreamThread-1] (ErrorLogStreamTest.java:90) - key:com.example.demo.controller.DemoController,start:1508060660000,end:1508060670000,value:3
2017-10-15 17:44:29 [StreamThread-1] (StreamThread.java:805) - stream-thread [StreamThread-1] Committing task StreamTask 0_2
2017-10-15 17:44:29 [StreamThread-1] (StreamThread.java:805) - stream-thread [StreamThread-1] Committing task StreamTask 1_1
2017-10-15 17:44:29 [StreamThread-1] (StreamThread.java:805) - stream-thread [StreamThread-1] Committing task StreamTask 1_2
2017-10-15 17:44:29 [StreamThread-1] (ErrorLogStreamTest.java:90) - key:com.example.demo.controller.ErrorController,start:1508060660000,end:1508060670000,value:1小结
自从kafka有了stream之后，感觉可以减少很多技术栈了，比如我可以不用学storm或者spark，就可以直接在kakfa上进行流式操作。关于kafka stream如何进行分布式呢，后续再研究下。
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