[root@cbas-virt-20 spark]# ./build/mvn -Phadoop-2.7 -Pyarn -Dhadoop.version=2.7.3 -Phive -Phive-thriftserver clean package -Dmaven.test.skip=true
exec: curl --progress-bar -L https://downloads.typesafe.com/zinc/0.3.15/zinc-0.3.15.tgz
curl: (35) SSL connect error
gzip: stdin: unexpected end of file
tar: Child returned status 1
tar: Error is not recoverable: exiting now
exec: curl --progress-bar -L https://downloads.typesafe.com/scala/2.11.8/scala-2.11.8.tgz
curl: (35) SSL connect error
gzip: stdin: unexpected end of file
tar: Child returned status 1
tar: Error is not recoverable: exiting now
./build/mvn: line 119: cd: /root/spark/build/scala-2.11.8/bin/../lib: 没有那个文件或目录
./build/mvn: line 120: cd: /root/spark/build/scala-2.11.8/bin/../lib: 没有那个文件或目录
./build/mvn: line 143: /root/spark/build/zinc-0.3.15/bin/zinc: 没有那个文件或目录
./build/mvn: line 145: /root/spark/build/zinc-0.3.15/bin/zinc: 没有那个文件或目录
Using `mvn` from path: /root/spark/build/apache-maven-3.3.9/bin/mvn
web.xml报错
The content of element type "web-app" must match "(icon?,display-
name?,description?,distributable?,context-param*,filter*,filter-mapping*,listener*,servlet*,s
JUnit4：Test文档中的解释：
The Test annotation supports two optional parameters.
The first, expected, declares that a test method should throw an exception.
If it doesn't throw an exception or if it
借鉴网上的思路，用java实现：
public class NoIfWhile {
/**
* @param args
*
* find x=1+2+3+....n
*/
public static void main(String[] args) {
int n=10;
int re=find(n);
System.o
在Linux中执行.sh脚本，异常/bin/sh^M: bad interpreter: No such file or directory。
分析：这是不同系统编码格式引起的：在windows系统中编辑的.sh文件可能有不可见字符，所以在Linux系统下执行会报以上异常信息。
解决：
1）在windows下转换：
利用一些编辑器如UltraEdit或EditPlus等工具
Binary search tree works well for a wide variety of applications, but they have poor worst-case performance. Now we introduce a type of binary search tree where costs are guaranteed to be loga
