hadoop2.5.2配置httpfs服务
hadoop2.5.2配置httpfs服务httpfs hadoop hdfs
测试环境
[*]ubuntu 14.04 单机
[*]hadoop2.5.2 伪分布式
[*]jdk1.7
作用
[*]通过HttpFs你可以在浏览器里面管理HDFS上的文件，功能同hadoop shell相似
[*]HttpFs还提供了一套REST 风格的API可以用来管理HDFS
缺点
[*]网络安全性
[*]需要配置acl
修改core-site.xml
<property>
<name>hadoop.proxyuser.root.hosts</name>
<value>localhost</value>
</property>
<property>
<name>hadoop.proxyuser.root.groups</name>
<value>*</value>
</property>
添加上述两个配置hadoop.proxyuser.root.hosts允许通过httpfs方式访问hdfs的主机名或者域名；hadoop.proxyuser.root.groups允许访问的客户端的用户组
配置httpfs环境变量
export CATALINA_BASE=/opt/work/hadoop/share/hadoop/httpfs/tomcat
临时配置，也可以在配置文件配置环境变量
重启hadoop集群
root@localhost:/opt/nfs#/opt/work/hadoop/sbin//stop-all.sh
root@localhost:/opt/nfs#/opt/work/hadoop/sbin//start-all.sh
启动httpfs服务
root@localhost:/opt/git/hadoop_dev/hdfsToInfoBright# /opt/work/hadoop/sbin/httpfs.sh start
Setting HTTPFS_HOME: /opt/work/hadoop
Setting HTTPFS_CONFIG: /opt/work/hadoop/etc/hadoop
Sourcing: /opt/work/hadoop/etc/hadoop/httpfs-env.sh
Setting HTTPFS_LOG: /opt/work/hadoop/logs
Setting HTTPFS_TEMP: /opt/work/hadoop/temp
Setting HTTPFS_HTTP_PORT: 14000
Setting HTTPFS_ADMIN_PORT: 14001
Setting HTTPFS_HTTP_HOSTNAME: localhost
Setting HTTPFS_SSL_ENABLED: false
Setting HTTPFS_SSL_KEYSTORE_FILE: /root/.keystore
Setting HTTPFS_SSL_KEYSTORE_PASS: password
Using CATALINA_BASE: /opt/work/hadoop/share/hadoop/httpfs/tomcat/
Setting HTTPFS_CATALINA_HOME: /opt/work/hadoop/share/hadoop/httpfs/tomcat/
Setting CATALINA_OUT: /opt/work/hadoop/logs/httpfs-catalina.out
Setting CATALINA_PID: /tmp/httpfs.pid
Using CATALINA_OPTS:
Adding to CATALINA_OPTS: -Dhttpfs.home.dir=/opt/work/hadoop -Dhttpfs.config.dir=/opt/work/hadoop/etc/hadoop -Dhttpfs.log.dir=/opt/work/hadoop/logs -Dhttpfs.temp.dir=/opt/work/hadoop/temp -Dhttpfs.admin.port=14001 -Dhttpfs.http.port=14000 -Dhttpfs.http.hostname=localhost -Dhttpfs.ssl.enabled=false -Dhttpfs.ssl.keystore.file=/root/.keystore -Dhttpfs.ssl.keystore.pass=password
Using CATALINA_BASE: /opt/work/hadoop/share/hadoop/httpfs/tomcat/
Using CATALINA_HOME: /opt/work/hadoop/share/hadoop/httpfs/tomcat
Using CATALINA_TMPDIR: /opt/work/hadoop/share/hadoop/httpfs/tomcat//temp
Using JRE_HOME: /usr/local/jdk1.7.0
Using CLASSPATH: /opt/work/hadoop/share/hadoop/httpfs/tomcat//bin/tomcat-juli.jar:/opt/work/hadoop/share/hadoop/httpfs/tomcat/bin/bootstrap.jar
Using CATALINA_PID: /tmp/httpfs.pid
Existing PID file found during start.
Removing/clearing stale PID file.
root@localhost:/opt/git/hadoop_dev/hdfsToInfoBright#
并查看启动日志，并确定环境变量的正确CATALINA_BASE的值
浏览器访问httpfs
http://localhost:14000/
页面显示：HttpFs service, service base URL at /webhdfs/v1. 根目录为：/webhdfs/v1
curl访问httpfs
root@localhost:/opt/nfs# curl -i -X PUT -T /opt/test.json "http://localhost:14000/webhdfs/v1/tmp/test.json?op=CREATE&data=true&user.name=root" -H "Content-Type:application/octet-stream"
将文件上传到hdfs
http访问文件：
http://localhost:14000/webhdfs/v1/tmp/test.json?user.name=root&op=open
即可下载test.json文件
考虑
[*]httpfs的安全性
[*]httpfs的性能：httpfs是一个tomcat启动的web服务，当数据文件非常大，上传下载的性能将骤减
[*]httpfs的并发访问：tomcat的并发问题
参考文献
官网：http://hadoop.apache.org/docs/r2.5.2/hadoop-hdfs-httpfs/ServerSetup.html
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