Hadoop,HBase集群环境搭建的问题集锦(二)

10.艾玛, Datanode也启动不了了?
找到log:
Caused by: java.net.UnknownHostException: Invalid host name: local host is: (unknown); destination host is: “maste1”:8031; java.net.
UnknownHostException; For more details see: http://wiki.apache.org/hadoop/UnknownHost

解决办法:
找到hadoop配置文件yarn-site.xml改正配置信息如下.

依然启动不了?
解决办法:
清空master1, master2 上的name里的数据,删除current目录,rm -rf current
清空slave1,slave2上的data01里的数据,删除current目录,rm -rf current
在主master1上name格式化, hdfs namenode -format
启动hdfs: ./start-all.sh
奏效!!赞!!!
11.命令#netstat -atln是做什么的?
答: 查看网络端口信息的.
-a (all)显示所有选项，默认不显示LISTEN相关
-t (tcp)仅显示tcp相关选项
-n 拒绝显示别名，能显示数字的全部转化成数字。
-l 仅列出有在 Listen (监听) 的服務状态
参考链接http://www.cnblogs.com/ggjucheng/archive/2012/01/08/2316661.html

12.Tomcat配置web账号密码:
答:配置web管理帐号
修改文件conf/tomcat-users.xml，在tomcat-users元素中添加帐号密码，需要指定角色.
# vi /usr/local/tomcat/server/conf/tomcat-users.xml

 <tomcat-users>
       <user name="admin" password="admin" roles="admin-gui,manager-gui" />
     </tomcat-users>

参考资料:http://blog.csdn.net/gyming/article/details/36060843

Solr安装参考资料:
http://www.linuxidc.com/Linux/2014-05/101443.htm
http://www.656463.com/article/IbiInu.htm
13. 查看 solr的logging会出现：
19:44:42 WARN SolrResourceLoader Can’t find (or read) directory to add to classloader: ../../../contrib/extraction/lib (resolved as: /home/solr_home/collection1/../../../contrib/extraction/lib).
这样的警告；其实这是因为找不到 对应的jar包造成的。
在/home/solr_home/collection1/conf/solrconfig.xml 中原有的配置文件为：

  <lib dir="../../../contrib/extraction/lib" regex=".*\.jar" />
  <lib dir="../../../dist/" regex="solr-cell-\d.*\.jar" /> 
  <lib dir="../../../contrib/clustering/lib/" regex=".*\.jar" />
  <lib dir="../../../dist/" regex="solr-clustering-\d.*\.jar" /> 
  <lib dir="../../../contrib/langid/lib/" regex=".*\.jar" />
  <lib dir="../../../dist/" regex="solr-langid-\d.*\.jar" /> 
  <lib dir="../../../contrib/velocity/lib" regex=".*\.jar" />
  <lib dir="../../../dist/" regex="solr-velocity-\d.*\.jar" /> 
  <!-- If a ‘dir‘ option (with or without a regex) is used and nothing
       is found that matches, a warning will be logged.
    -->
  <lib dir="/non/existent/dir/yields/warning" />

这个是警告信息

解决办法: 可以将 solr-4.3.1\目录下的 contrib 和 dist 拷贝到 /home/solr_home/collection1/conf 下面就可以了
然后修改上面的配置文件/home/solr_home/collection1/conf/solrconfig.xml即可。

<lib dir="conf/contrib/extraction/lib" regex=".*\.jar" />
  <lib dir="conf/dist/" regex="solr-cell-\d.*\.jar" /> 
  <lib dir="conf/contrib/clustering/lib/" regex=".*\.jar" />
  <lib dir="conf/dist/" regex="solr-clustering-\d.*\.jar" /> 
  <lib dir="conf/contrib/langid/lib/" regex=".*\.jar" />
  <lib dir="conf/dist/" regex="solr-langid-\d.*\.jar" /> 
  <lib dir="conf/contrib/velocity/lib" regex=".*\.jar" />
  <lib dir="conf/dist/" regex="solr-velocity-\d.*\.jar" /> 
  <!-- If a ‘dir‘ option (with or without a regex) is used and nothing
       is found that matches, a warning will be logged.
    -->
  <lib dir="/non/existent/dir/yields/warning" /> 

14.Solr中如何新建core?
参考资料:http://blog.csdn.net/clj198606061111/article/details/21288499/
15 solr完美安装参考链接?
http://www.656463.com/article/IbiInu.htm
http://my.oschina.net/liuxundemo/blog/208236