关于PHP读取HDFS的错误记录
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）。
[*]# /tmp/hadoop-1.0.4/src/contrib/thriftfs/scripts/start_thrift_server.sh 59256
[*]log4j:ERROR Could not instantiate class .
[*]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
[*]#
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。
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