解决zookeeper linux下无法启动的问题
在linux下安装zookeeper时，出现了如下的错误：
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[hadoop@hadoop-master bin]$ ./zkServer.sh startJMX disabled by user requestUsing config: /opt/zookeeper-3.3.3/bin/../conf/zoo.cfgStarting zookeeper ... STARTED[hadoop@hadoop-master bin]$ 2011-07-05 10:33:57,587 - INFO [main:QuorumPeerConfig@90] - Reading configuration from: /opt/zookeeper-3.3.3/bin/../conf/zoo.cfg2011-07-05 10:33:57,596 - WARN [main:QuorumPeerMain@105] - Either no config or no quorum defined in config, running in standalone modeException in thread "main" java.lang.NoSuchMethodError: method java.lang.management.ManagementFactory.getPlatformMBeanServer with signature ()Ljavax.management.MBeanServer; was not found. at org.apache.zookeeper.jmx.ManagedUtil.registerLog4jMBeans(ManagedUtil.java:48) at org.apache.zookeeper.server.ZooKeeperServerMain.initializeAndRun(ZooKeeperServerMain.java:73) at org.apache.zookeeper.server.ZooKeeperServerMain.main(ZooKeeperServerMain.java:51) at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:108) at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:76)
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?发现没有找到java.lang.management下的一个方法。如果使用的是标准的JDK的话，不应该出现这样的错误的。于是查看zkServer.sh的脚本。发现启动java程序的脚本如下：
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java "-Dzookeeper.log.dir=${ZOO_LOG_DIR}" "-Dzookeeper.root.logger=${ZOO_LOG4J_PROP}" \ -cp "$CLASSPATH" $JVMFLAGS $ZOOMAIN "$ZOOCFG" &?
?在linux下直接执行java命令，发现输出如下：
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[hadoop@hadoop-master bin]$ javaUsage: gij [OPTION] ... CLASS [ARGS] ... to invoke CLASS.main, or gij -jar [OPTION] ... JARFILE [ARGS] ... to execute a jar fileTry `gij --help' for more information.
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?显然，zkServer.sh使用的java不正确。使用的gij的java。解决这个问题就简单了，把脚本改成：
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$JAVA_HOME/bin/java "-Dzookeeper.log.dir=${ZOO_LOG_DIR}" "-Dzookeeper.root.logger=${ZOO_LOG4J_PROP}" \ -cp "$CLASSPATH" $JVMFLAGS $ZOOMAIN "$ZOOCFG" &?
这样修改之后，就能正常运行了。
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