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转载自http://www.javacodegeeks.com/2011/04/erlang-vs-java-memory-architecture.htmlI read a really, really interesting article on memory management strategies for theErlangVM. It was written as athesisbyJesper WilhelmssonI thought it might be nice to discuss the differences betweenErlang's memory se 阅读全文
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Loop devices============Increasing the number of loop devices-------------------------------------If you see "mount: could not find any free loop device" you haveto increase the number of loop devices by adding the followingto /etc/modprobe.conf on a 2.6 kernel (or /etc/modules.conf ona 2.4 kernel). 阅读全文
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To solve the problem with ObjectInputStream.readObject():java.io.StreamCorruptedException:invalid type code: ACAppendableObjectOutputStream 阅读全文
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1. use the tomcat manager.打开%tomcat_home%\conf\tomcat-users.xml察看也可以在里边增加和删除用户名和密码 阅读全文
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vi /etc/profileexport JAVA_HOME=/usr/lib/jvm/javaexport CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/jre/libexport PATH=$JAVA_HOME/lib:$JAVA_HOME/jre/bin:$PATH:$HOME/binexport HADOOP_HOME=/opt/hadoo... 阅读全文
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1. Overview.Oauth provides a method for clients to access a protected resource onbehalf of a resource owner. +--------+ +---------------+ | |--(A)-- Authorization Request --->| Resource | | | ... 阅读全文
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1. Start the cassandra:a). in conf/storage-conf.xml,make sure that the paths exist forCommitLogDirectoryandDataFileDirectories.b).inconf/log4j.propertiesand make sure that directories exist for the co... 阅读全文
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大数据量，海量数据 处理方法总结来源： 葛林华的日志大数据量的问题是很多面试笔试中经常出现的问题，比如baidu google 腾讯 这样的一些涉及到海量数据的公司经常会问到。 下面的方法是我对海量数据的处理方法进行了一个一般性的总结，当然这些方法可能并不能完全覆盖所有的问题，但是这样的一些方法也基本可以处理绝大多数遇到的问题。下面的一些问题基本直接来源于公司的面试笔试题目，方法不一定最优，如果你... 阅读全文
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1. if you want to see the detailed error message on the console, instead of reading it from the surefire files, you can use the maven-surefire-plugin:<plugin> <groupId>org.apache.maven.... 阅读全文