我在我的 Linux 机器上安装了 Cloudera 的伪分布式版本，并成功运行了一些简单的 MapReduce 示例。但是，我试图让 Oozie 工作，并且在尝试执行简单的工作流程时收到的错误完全让我感到困惑：
tim@phocion:~$ oozie version
Oozie client build version: 3.1.3-cdh4.0.1
根据文档，将预打包的示例复制到 HDFS 并执行：
tim@phocion:~$ oozie job -oozie http://phocion:11000/oozie -config /user/tim/examples/apps/map-reduce/job.properties -run
Error: E0504 : E0504: App directory [hdfs://phocion:8020/user/tim/examples/apps/map-reduce] does not exist
检查文件是否存在：
tim@phocion:~$ hdfs dfs -ls /user/tim/examples/apps/map-reduce
Found 3 items
-rwxr-xr-x 1 tim tim 995 2012-10-03 14:47 /user/tim/examples/apps/map-reduce/job.properties
drwxrwxr-x - tim tim 4096 2012-10-03 14:47 /user/tim/examples/apps/map-reduce/lib
-rwxr-xr-x 1 tim tim 2559 2012-10-03 14:47 /user/tim/examples/apps/map-reduce/workflow.xml
确实如此。我可以连接到 phocion:8020 吗？
tim@phocion:~$ telnet phocion 8020
Trying 127.0.1.1...
Connected to phocion.
Escape character is '^]'.
我可以。所以，基本上，我完全不知道这个错误试图告诉我什么——这个文件夹确实存在。我假设错误太模糊，无法完全传达问题所在，但我几乎没有发现任何东西可以为我指明正确的方向。
我也可以用其他 3rd 方教程复制这个错误。
花了很多时间翻阅配置文件，以至于不想再看电脑了。也许我在这里过度思考这个问题，但任何帮助将不胜感激。
编辑：添加完整的 job.properties （与默认值没有太大不同）：
nameNode=hdfs://phocion:8020
jobTracker=phocion:8021
queueName=default
examplesRoot=examples
oozie.wf.application.path=${nameNode}/user/${user.name}/${examplesRoot}/apps/map-reduce
outputDir=map-reduce
更多编辑：当文件夹不存在时，我得到同样的错误，在我把 if 放回 hdfs 之后。最后的想法是它的权限问题， chmod 777 仍然得到同样的错误。命令行上传递的完整 HDFS 路径不能解决问题。在 oozie 甚至 root 帐户下运行它都不起作用：
tim@phocion:~$ oozie job -oozie http://phocion:11000/oozie -run -config /home/tim/examples/apps/map-reduce/job.properties -Doozie.wf.application.path=hdfs://phocion:8020/user/tim/examples/apps/map-reduce
Error: E0504 : E0504: App directory [hdfs://phocion:8020/user/tim/examples/apps/map-reduce] does not exist
tim@phocion:~$ hdfs dfs -put examples/ /user/tim/
12/10/04 13:26:43 INFO util.NativeCodeLoader: Loaded the native-hadoop library
tim@phocion:~$ oozie job -oozie http://phocion:11000/oozie -run -config /home/tim/examples/apps/map-reduce/job.properties -Doozie.wf.application.path=hdfs://phocion:8020/user/tim/examples/apps/map-reduce
Error: E0504 : E0504: App directory [hdfs://phocion:8020/user/tim/examples/apps/map-reduce] does not exist
tim@phocion:~$ hdfs dfs -chmod -R 777 /user/tim/examples/
12/10/04 13:28:16 INFO util.NativeCodeLoader: Loaded the native-hadoop library
tim@phocion:~$ oozie job -oozie http://phocion:11000/oozie -run -config /home/tim/examples/apps/map-reduce/job.properties -Doozie.wf.application.path=hdfs://phocion:8020/user/tim/examples/apps/map-reduce
Error: E0504 : E0504: App directory [hdfs://phocion:8020/user/tim/examples/apps/map-reduce] does not exist
tim@phocion:~$ sudo -u oozie oozie job -oozie http://phocion:11000/oozie -run -config /home/tim/examples/apps/map-reduce/job.properties -Doozie.wf.application.path=hdfs://phocion:8020/user/tim/examples/apps/map-reduce
[sudo] password for tim:
Error: E0504 : E0504: App directory [hdfs://phocion:8020/user/tim/examples/apps/map-reduce] does not exist
tim@phocion:~$ sudo -u root oozie job -oozie http://phocion:11000/oozie -run -config /home/tim/examples/apps/map-reduce/job.properties -Doozie.wf.application.path=hdfs://phocion:8020/user/tim/examples/apps/map-reduce
Error: E0504 : E0504: App directory [hdfs://phocion:8020/user/tim/examples/apps/map-reduce] does not exist
这个命令理论上应该有效吗？
tim@phocion:~$ hdfs dfs -ls hdfs://phocion:8020/user/tim/examples/apps/map-reduce
ls: `hdfs://phocion:8020/user/tim/examples/apps/map-reduce': No such file or directory
这会在执行 oozie 命令后显示在 hadoop-hdfs 日志中：
2012-10-04 13:50:00,152 INFO org.apache.hadoop.hdfs.server.namenode.FSEditLog: Starting log segment at 113297
2012-10-04 13:50:00,874 INFO org.apache.hadoop.hdfs.server.namenode.TransferFsImage: Opening connection to http://localhost.localdomain:50090/getimage?getimage=1&txid=113296&storageInfo=-40:2092007576:0:cluster8
2012-10-04 13:50:00,875 ERROR org.apache.hadoop.security.UserGroupInformation: PriviledgedActionException as:hdfs (auth:SIMPLE) cause:java.net.ConnectException: Connection refused
2012-10-04 13:50:00,876 WARN org.mortbay.log: /getimage: java.io.IOException: GetImage failed. java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at java.net.Socket.connect(Socket.java:478)
at sun.net.NetworkClient.doConnect(NetworkClient.java:163)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:395)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:530)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:234)
at sun.net.www.http.HttpClient.New(HttpClient.java:307)
at sun.net.www.http.HttpClient.New(HttpClient.java:324)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:970)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:911)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:836)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1172)