我正确设置了Hadoop v.1.2.1的HDFS，SELECT distinct
t.user_name
, u.display_name
, u.lower_parent_name
, u.email_address
FROM (
SELECT
cu.user_name
, cu.display_name
, cm.lower_parent_name
, cu.email_address
FROM cwd_user AS cu
INNER JOIN cwd_membership AS cm ON cu.directory_id=cm.directory_id
AND cu.lower_user_name=cm.lower_child_name
AND cm.membership_type='GROUP_USER'
WHERE cm.lower_parent_name LIKE 'zz%'
AND BINARY cu.user_name = lower( cu.user_name)
) u
JOIN cwd_user t ON t.user_name = u.user_name
ORDER BY t.user_name;
正确地返回了HDFS中的文件。但是当我想运行以下命令时，我遇到了一个问题：
hadoop fs -ls /user/${username}这是错误：
username=$USER
hadoop fs -mkdir /user/${username}/project
hadoop fs -put ${inputfilespath}* /user/${username}/project/
mpJar=${rootPath}mp/src/mp.jar
mp_exec=mp
MR_HADOOPJAR=/opt/hadoop-1.2.1/hadoop-core-1.2.1.jar
MR_MANIFEST=${rootPath}mp/src/manifest.txt
echo "Compiling mp source code.."
javac -classpath $MR_HADOOPJAR ${rootPath}mp/src/*.java
echo "Creating mp jar.."
jar cvfm $mpJar $MR_MANIFEST ${rootPath}mp/src/*.class
export HADOOP_CLASSPATH=$mpJar
hadoop $mp_exec hdfs:/user/${username}/project
但是当我使用Usage: <input directory>
There is no files in this path: /user/mohebbi/project
Exception in thread "main" java.lang.NullPointerException
at mp.main(mp.java:24)
时，它显示文件在此目录中。 （hadoop fs -ls /user/mohebbi/project是用户名）。我很困惑，请帮助我。
另外，我尝试了mohebbi并遇到了同样的错误。
感谢