log4j | 易学教程

Yarn mini-cluster container log directories don't contain syslog files

阅读更多关于 Yarn mini-cluster container log directories don't contain syslog files

问题 I have setup YARN MapReduce mini-cluster with 1 node manager, 4 local and 4 log directories and so on based on hadoop 2.3.0 from CDH 5.1.0. It looks more or less working. What I failed to achieve is syslog logging from containers. I see container log directories, stdout and stderr files but not syslog with MapReduce container logging. Appropriate stderr warns I have no log4j configuration and contains no any other string: log4j:WARN No appenders could be found for logger (org.apache.hadoop

How is logback's “prudent mode” implemented?

阅读更多关于 How is logback's “prudent mode” implemented?

问题 The prudent mode in logback serializes IO operations between all JVMs writing to the same file, potentially running on different hosts. In other logging frameworks, logging to a central TCP (or JMS) appender seems to be the only solution if output from many loggers should go to the same file. As I am using a Delphi library which is based on log4j and also can not log to the same file from different instances of the same applications (on a terminal server), it would be interesting to know how

How is logback's “prudent mode” implemented?

阅读更多关于 How is logback's “prudent mode” implemented?

log4cxx: configuring appender with arguments

阅读更多关于 log4cxx: configuring appender with arguments

问题 log4cxx's config is read from follow-by xml via: DOMConfigurator::configure("log4cxx.xml"); But, want to have filename set at runtime, and this creates a problem of either having multiple .xmls for reading, or creating one on the fly (in memory/at disk -- no matter where). <appender name="appxNormalAppender" class="org.apache.log4j.FileAppender"> <param name="file" value="appxLogFile.log" /> <param name="append" value="true" /> <layout class="org.apache.log4j.PatternLayout"> <param name=

log4cxx: configuring appender with arguments

阅读更多关于 log4cxx: configuring appender with arguments

spark streaming application and kafka log4j appender issue

阅读更多关于 spark streaming application and kafka log4j appender issue

问题 I am testing my spark streaming application, and I have multiple functions in my code: - some of them operate on a DStream[RDD[XXX]], some of them on RDD[XXX] (after I do DStream.foreachRDD). I use Kafka log4j appender to log business cases that occur within my functions, that operate on both DStream[RDD] & RDD it self. But data gets appended to Kafka only when from functions that operate on RDD -> it doesn't work when I want to append data to kafka from my functions that operate on DStream.

Excessive console messages from Kafka Producer

阅读更多关于 Excessive console messages from Kafka Producer

问题 How do you control the console logging level of a Kafka Producer or Consumer? I am using the Kafka 0.9 API in Scala. Every time send on the KafkaProducer is called, the console gives output like below. Could this indicate I do not have the KafkaProducer set up correctly, rather than just an issue of excessive logging? 17:52:21.236 [pool-10-thread-7] INFO o.a.k.c.producer.ProducerConfig - ProducerConfig values: compression.type = none metric.reporters = [] metadata.max.age.ms = 300000 . . . 17

Log4j logging directly to elasticsearch server

阅读更多关于 Log4j logging directly to elasticsearch server

问题 I'm a bit confused on how can I put my log entries directly to elasticsearch (not logstash). So far I found a few appenders ( log4j.appender.SocketAppender , log4j.appender.server etc.) that allow to send logs to remote host and also ConversionPattern possibility that seems to allow us to convert logs to "elastic-friendly" format, but this approach looks freaky... or do I mistake? Is this the one way to send logs to elastic ? So far I have a such config: log4j.rootLogger=DEBUG, server log4j

log4j.properties doesn't work correctly on wildfly

阅读更多关于 log4j.properties doesn't work correctly on wildfly

问题 I have a log4j.properties file in the classpath. It was found at the location APP/XX.jar/log4j.properties. And I noticed that in the ear file I can also find log4j-1.2.17.jar in lib folder. But whatever I wrote in the log4j.properties file, they were ignored. Like: log4j.rootCategory=WARN Or something like this: log4j.rootCategory=INFO, A1 log4j.appender.A1=org.apache.log4j.ConsoleAppender log4j.logger.org.springframework=WARN But all of the loggings will still be printed on the server. Did I

Java异常和Log4j

阅读更多关于 Java异常和Log4j

异常和Log4j：一、异常：异常是指在程序的运行过程中所发生的不正常的事件，它会中断正在运行的程序。引发多种类型的异常： 1、排列 catch 语句的顺序:先子类后父类 2、发生异常时按顺序逐个匹配。 3、只执行第一个与异常类型匹的 catch 语句。 try-catch 块中存在 return 语句，是否还执行 finally 块，如果执行，说出执行顺序? 执行。先 try - catch - finally - return try-catch- finally 块中， finally 块唯一不执行的情况是什么？ System . exit (1)。二、异常处理：关键字：try。catch。finally。 throw。（手动抛出异常） throws。（声明方法可能要抛出的各种异常。）捕获异常。声明异常。抛出异常。常见的异常类型：Exception 异常层次结构的父类。 ArithmeticException。算术错误情形，如以零作除数。 ArrayIndexOutOfBoundsException 。数组下标越界。 NullPointerException。尝试访问 null 对象成员。 ClassNotFoundException。不能加载所需的类。 IllegalArgumentException。方法接收到非法参数。