用php實現對HDFS的操作

用php實現對HDFS的操作，大體步驟如下：

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 //安裝期間網路不可中斷    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檔案中對TOP和CLASSPATH行後，甚至更換了thrift版本到0.2.0依然出現如下錯誤（運行上述21行的結果）。

[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.<clinit>(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.<init>(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$HadoopThriftHandler.<clinit>(HadoopThriftServer.java:41)            at org.apache.hadoop.thriftfs.HadoopThriftServer.<init>(HadoopThriftServer.java:592)            at org.apache.hadoop.thriftfs.HadoopThriftServer.main(HadoopThriftServer.java:612)    log4j:ERROR Could not instantiate appender named "EventCounter".    Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/hadoop/conf/Configuration            at org.apache.hadoop.thriftfs.HadoopThriftServer$HadoopThriftHandler.<init>(HadoopThriftServer.java:125)            at org.apache.hadoop.thriftfs.HadoopThriftServer.<init>(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]#

從網上尋找了一些方法（其中包括修改/tmp/hadoop-1.0.4/conf/log4j.properties檔案，把log4j.appender.EventCounter=org.apache.hadoop.log.metrics.EventCounter替換成log4j.appender.EventCounter=org.apache.hadoop.log.metrics.jvm.EventCounter）試了試都不行。

既然別人的可以，自己的卻不可以。那就要考慮軟體環境問題了。與承載Hadoop的作業系統應該是關係不大。可能的就是Hadoop的版本和java SDK的版本了。