Eclipse调试Hbase程序“Failed to detect a valid hadoop home directory java.id.IOException”问题

在eclipse调试hbase程序时发现如下日志：

2014-11-21 16:27:56,030 DEBUG [org.apache.hadoop.util.Shell] - Failed to detect a valid hadoop home directory

java.io.IOException : HADOOP_HOME or hadoop.home.dir are not set.

      at org.apache.hadoop.util.Shell.checkHadoopHome( Shell.java:225)

      at org.apache.hadoop.util.Shell.<clinit>( Shell.java:250)

      at org.apache.hadoop.util.StringUtils.<clinit>(StringUtils.java:76)

      at org.apache.hadoop.conf.Configuration.getStrings(Configuration.java:1514)

      at org.apache.hadoop.hbase.zookeeper.ZKConfig.makeZKProps(ZKConfig.java:113)

      at org.apache.hadoop.hbase.zookeeper.ZKConfig.getZKQuorumServersString(ZKConfig.java:265)

      at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.<init>(ZooKeeperWatcher.java:159)

      at org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.<init>(ZooKeeperWatcher.java:134)

      at org.apache.hadoop.hbase.client.ZooKeeperKeepAliveConnection.<init>(ZooKeeperKeepAliveConnection.java:43)

      at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getKeepAliveZooKeeperWatcher(HConnectionManager.java:1763)

      at org.apache.hadoop.hbase.client.ZooKeeperRegistry.getClusterId(ZooKeeperRegistry.java:82)

      at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.retrieveClusterId(HConnectionManager.java:852)

      at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.<init>(HConnectionManager.java:657)

      at sun.reflect.NativeConstructorAccessorImpl.newInstance0( Native Method)

      at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)

      at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)

      at java.lang.reflect.Constructor.newInstance( Constructor.java:513)

      at org.apache.hadoop.hbase.client.HConnectionManager.createConnection(HConnectionManager.java:409)

      at org.apache.hadoop.hbase.client.HConnectionManager.createConnection(HConnectionManager.java:304)

      at com.emar.adx.yiqifa.dal.common.hbase.HBaseConnectionFactory.getConnection(HBaseConnectionFactory.java:54)

      at com.emar.adx.yiqifa.dal.common.hbase.HBaseUtils.getConnnection(HBaseUtils.java:34)

      at com.emar.adx.yiqifa.dal.common.hbase.HBaseUtilsTest.testGetTable(HBaseUtilsTest.java:39)

      at sun.reflect.NativeMethodAccessorImpl.invoke0( Native Method)

      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

      at java.lang.reflect.Method.invoke( Method.java:597)

      at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)

      at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)

      at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)

      at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)

      at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)

      at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)

      at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)

      at org.junit.runners.ParentRunner$3.run( ParentRunner.java:193)

      at org.junit.runners.ParentRunner$1.schedule( ParentRunner.java:52)

      at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)

      at org.junit.runners.ParentRunner.access$000( ParentRunner.java:42)

      at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)

      at org.junit.runners.ParentRunner.run( ParentRunner.java:236)

      at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)

      at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)

      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)

      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)

      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

从日志上来看这只是一个debug信息，但探索究竟是程序员的天性，于是毅然决然的走上了探寻究竟的道路，行从Shell.java开始，Shell.java中通过System.getProperties("hadoop.home.dir")和System.env("HADOOP_HOME")获取HADOOP_HOME目录，如果在开发环境中没有设置这两个环境变量任何一个，程序运行是就会打出上面的日志。

   知道了日志输出的原因就有了解决办法（假设开发环境中hadoop安装在d:\hadoop目录下）：

   方法一：在windows中设置环境变量HOADOOP_HOME=d:\hadoop
   方法二：在测试程序时通过System.setProperty("hadoop.home.dir", "d:\\hadoop")

 

   以上日志不是HBase的程序输出的，在Hadoop开发中也会遇到这样的日志，也可以通过上面的方法解决。