关于PHP读取HDFS的错误记录

浅见池也

昨日实现了用java对HDFS的操作（创建、删除、重命名目录，创建、删除、重命名文件），今天打算用php实现对HDFS的同样操作。

大体步骤如下：

• wget https://dist.apache.org/repos/dist/release/thrift/0.9.0/thrift-0.9.0.tar.gz
  
• tar zxvf thrift-0.9.0.tar.gz
  
• cd thrift-0.9.0
  
• find / -name 'bootstrap.sh'
  
• yum install automake libtool flex bison pkgconfig gcc-c++ boost-devel libevent-devel zlib-devel python-devel ruby-devel
  
• /tmp/thrift-0.9.0/contrib/fb303/bootstrap.sh
  
• ./configure -prefix=/usr/local/thrift
  
• make //安装期间网络不可中断
  
• make install
  
• cp -R ./lib/php/ /usr/local/thrift/lib/
  
• cp -R /tmp/hadoop-1.0.4/src/contrib/thriftfs/gen-php/ /usr/local/thrift/lib/php/src/packages/hadoopfs/
  
• cd ./lib/php/src/ext/thrift_protocol/
  
• yum install php-devel
  
• /usr/bin/phpize
  
• ./configure
  
• make
  
• make test
  
• make install
  
• vim /etc/php.ini
  
• cd /tmp/hadoop-1.0.4/src/contrib/thriftfs/scripts/
  
• /tmp/hadoop-1.0.4/src/contrib/thriftfs/scripts/start_thrift_server.sh
  

在修改了/tmp/hadoop-1.0.4/src/contrib/thriftfs/scripts/start_thrift_server.sh文件中对TOP和CLASSPATH行后，甚至更换了thrift版本到0.2.0依然出现如下错误（运行上述21行的结果）。

• [root@srv211 hadoop-1.0.4]# /tmp/hadoop-1.0.4/src/contrib/thriftfs/scripts/start_thrift_server.sh 59256
  
• log4j:ERROR Could not instantiate class [org.apache.hadoop.log.metrics.EventCounter].
  
• java.lang.ClassNotFoundException: org.apache.hadoop.log.metrics.EventCounter
  
•         at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
  
•         at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
  
•         at java.security.AccessController.doPrivileged(Native Method)
  
•         at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
  
•         at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
  
•         at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
  
•         at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
  
•         at java.lang.Class.forName0(Native Method)
  
•         at java.lang.Class.forName(Class.java:186)
  
•         at org.apache.log4j.helpers.Loader.loadClass(Loader.java:179)
  
•         at org.apache.log4j.helpers.OptionConverter.instantiateByClassName(OptionConverter.java:320)
  
•         at org.apache.log4j.helpers.OptionConverter.instantiateByKey(OptionConverter.java:121)
  
•         at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:664)
  
•         at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:647)
  
•         at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:544)
  
•         at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:440)
  
•         at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:476)
  
•         at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:471)
  
•         at org.apache.log4j.LogManager.(LogManager.java:125)
  
•         at org.apache.log4j.Logger.getLogger(Logger.java:105)
  
•         at org.apache.commons.logging.impl.Log4JLogger.getLogger(Log4JLogger.java:289)
  
•         at org.apache.commons.logging.impl.Log4JLogger.(Log4JLogger.java:109)
  
•         at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  
•         at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
  
•         at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
  
•         at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
  
•         at org.apache.commons.logging.impl.LogFactoryImpl.createLogFromClass(LogFactoryImpl.java:1116)
  
•         at org.apache.commons.logging.impl.LogFactoryImpl.discoverLogImplementation(LogFactoryImpl.java:914)
  
•         at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:604)
  
•         at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:336)
  
•         at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:704)
  
•         at org.apache.hadoop.thriftfs.HadoopThriftServer$HadoopThriftHandler.(HadoopThriftServer.java:41)
  
•         at org.apache.hadoop.thriftfs.HadoopThriftServer.(HadoopThriftServer.java:592)
  
•         at org.apache.hadoop.thriftfs.HadoopThriftServer.main(HadoopThriftServer.java:612)
  
• log4j:ERROR Could not instantiate appender named "EventCounter".
  
• Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/conf/Configuration
  
•         at org.apache.hadoop.thriftfs.HadoopThriftServer$HadoopThriftHandler.(HadoopThriftServer.java:125)
  
•         at org.apache.hadoop.thriftfs.HadoopThriftServer.(HadoopThriftServer.java:592)
  
•         at org.apache.hadoop.thriftfs.HadoopThriftServer.main(HadoopThriftServer.java:612)
  
• Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.conf.Configuration
  
•         at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
  
•         at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
  
•         at java.security.AccessController.doPrivileged(Native Method)
  
•         at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
  
•         at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
  
•         at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
  
•         at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
  
•         ... 3 more
  
• [root@srv211 hadoop-1.0.4]#
  

从网上查找了一些方法（其中包括修改/tmp/hadoop-1.0.4/conf/log4j.properties文件，把log4j.appender.EventCounter=org.apache.hadoop.log.metrics.EventCounter替换成log4j.appender.EventCounter=org.apache.hadoop.log.metrics.jvm.EventCounter）试了试都不行。



既然别人的可以，自己的却不可以。那就要考虑软件环境问题了。与承载Hadoop的操作系统应该是关系不大。可能的就是Hadoop的版本和java SDK的版本了。