| 共 102 篇文章 |
|
Tableau DesktopCloudera Hadoop HiveCloudera Impala SoluciónOption 1Remove multiple COUNT D statements.Option 2:For more information, see Query Options for the SET Command page (for Cloudera 5.3.x) on the Cloudera website. Note: In Impala 2.0 and later, you can set query options directly through the JDBC and ... 阅1796 转3 评0 公众公开 15-12-15 17:45 |
In Spring, you can uses this special <null /> tag to pass a “null” value into constructor argument or property.1. Constructor Argument.<bean id="defaultMongoTypeMapper"class="org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper"><constructor-arg name="typeKey&q... 阅79 转0 评0 公众公开 15-12-10 18:04 |
阅1137 转7 评0 公众公开 15-11-11 14:11 |
线程命名。对正在运行的JVM进行线程转储（thread dump）或者调试时，线程池默认的命名机制是pool-N-thread-M，这里N是线程池的序号（每新创建一个线程池，这个N都会加一），而M是池里线程的序号。比方说，pool-2-thread-3指的是JVM生命周期中第二个线程池里的第三个线程。客户端线程和线程池之间会有一个任务队列。再进一步说，如果线程池不是... 阅410 转1 评0 公众公开 15-06-24 21:18 |
Java二进制操作指南本文由 ImportNew - 吴 鹏煜 翻译自 sys.cs.rice.edu。一个以1开头的二进制数移位后还将以1开头，一个以0开头的二进制树移位后还将以0开头。在你的代码里操作二进制数字的便利方法是使用Integer.parseInt()方法。Integer.parseInt(“101″,2)代表着把二进制数101转换为十进制数（5）。建议：自己实现一个用来把二进制位（比... 阅323 转0 评0 公众公开 15-04-08 09:24 |
“-bash: fork: Resource temporarily unavailable”bash - and all the other shells, too - use the fork system call on Unix systems in order to actually create the process that you want to launch from the shell.In this case, bash tells you that the system call ended with Resource temporarily unavailable, which translates... 阅191 转1 评0 公众公开 15-01-29 10:00 |
如何何解决 java.lang.OutOfMemoryError: unable to create new native thread.To reduce the stack size, add “-Xss64kb” to the JVM options. I suggest you start with 64k, try the application, then if it doesn’t work (it will fail with a Java.lang.StackOverFlowError), increase the stack to 128k, then 256k, and so on. The ... 阅65 转0 评0 公众公开 15-01-29 09:40 |
setFirstDayOfWeek无效。When setting or getting the WEEK_OF_MONTH or WEEK_OF_YEAR fields, Calendar must determine the first week of the month or year as a reference point.The first week of a month or year is defined as the earliest seven day period beginning on getFirstDayOfWeek() and containing at least getMinimalDays... 阅781 转0 评0 公众公开 15-01-22 14:26 |
阅1003 转1 评0 公众公开 15-01-06 17:43 |
代理类与委托类之间通常会存在关联关系，一个代理类的对象与一个委托类的对象关联，代理类的对象本身并不真正实现服务，而是通过调用委托类的对象的相关方法，来提供特定的服务。JDK的动态代理机制只能代理实现了接口的类，而不能实现接口的类就不能实现JDK的动态代理，cglib是针对类来实现代理的，他的原理是对指定的目标类生成一个子类，并覆... 阅32 转0 评0 公众公开 14-12-02 15:14 |
