我正在开发一个java程序。
java程序将数据从hive导出到mysql。
首先，我写代码

ProcessBuilder pb = new ProcessBuilder("sqoop-export", "export", 
         "--connect",               "jdbc:mysql://localhost/mydb", 
         "--hadoop-home",    "/home/yoonhok/development/hadoop-1.1.1", 
         "--table",                    "mytable", 
         "--export-dir",            "/user/hive/warehouse/tbl_2", 
         "--username",            "yoonhok", 
         "--password",            "1234");

try {
    Process p = pb.start();
    if (p.waitFor() != 0) {
        System.out.println("Error: sqoop-export failed.");
        return false;
    }
} catch (IOException e) {
    e.printStackTrace();
} catch (InterruptedException e) {
    e.printStackTrace();
}

它工作得很好。
但是我学会了在java中使用sqoop的新方法。
sqoop还不支持客户端api。
所以我添加了sqoop lib并编写了sqoop.run（）
其次，我用新的方法重新编写代码。

String[] str = {"export", 
     "--connect",               "jdbc:mysql://localhost/mydb", 
     "--hadoop-home",    "/home/yoonhok/development/hadoop-1.1.1", 
     "--table",                    "mytable", 
     "--export-dir",            "/user/hive/warehouse/tbl_2", 
     "--username",            "yoonhok", 
     "--password",            "1234"
};

if (Sqoop.runTool(str) == 1) {
     System.out.println("Error: sqoop-export failed.");
     return false;
}

但它不跑。
我错了。。。。。。

13/02/14 16:17:09 WARN tool.BaseSqoopTool: Setting your password on the command-line is insecure. Consider using -P instead. 
13/02/14 17:43:12 WARN sqoop.ConnFactory: $SQOOP_CONF_DIR has not been set in the environment. Cannot check for additional configuration.
13/02/14 16:17:09 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset. 
13/02/14 16:17:09 INFO tool.CodeGenTool: Beginning code generation 
13/02/14 16:17:09 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `tbl_2` AS t LIMIT 1 
13/02/14 16:17:09 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `tbl_2` AS t LIMIT 1 
13/02/14 16:17:09 INFO orm.CompilationManager: HADOOP_HOME is /home/yoonhok/development/hadoop-1.1.1 
Note: /tmp/sqoop-yoonhok/compile/45dd1a113123726796a4ed4ce10c9110/tbl_2.java uses or overrides a deprecated API. 
Note: Recompile with -Xlint:deprecation for details. 
13/02/14 16:17:10 INFO orm.CompilationManager: Writing jar file: /tmp/sqoop-yoonhok/compile/45dd1a113123726796a4ed4ce10c9110/tbl_2.jar 
13/02/14 16:17:10 INFO mapreduce.ExportJobBase: Beginning export of tbl_2 
13/02/14 16:17:10 WARN mapreduce.ExportJobBase: Input path file:/user/hive/warehouse/tbl_2 does not exist 
13/02/14 16:17:11 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable 
13/02/14 16:17:11 INFO mapred.JobClient: Cleaning up the staging area file:/tmp/hadoop-yoonhok/mapred/staging/yoonhok314601126/.staging/job_local_0001 
13/02/14 16:17:11 ERROR security.UserGroupInformation: PriviledgedActionException as:yoonhok cause:org.apache.hadoop.mapreduce.lib.input.InvalidInputException: Input path does not exist: file:/user/hive/warehouse/tbl_2 
13/02/14 16:17:11 ERROR tool.ExportTool: Encountered IOException running export job: org.apache.hadoop.mapreduce.lib.input.InvalidInputException: Input path does not exist: file:/user/hive/warehouse/tbl_2

我看见了 $SQOOP_CONF_DIR has not been set in the environment. 所以我补充说
sqoop\u conf\u dir=/home/yoonhok/development/sqoop-1.4.2.bin\u hadoop-1.0.0/conf
在
/etc/环境
再试一次，但是错误。。。

13/02/14 16:17:09 WARN tool.BaseSqoopTool: Setting your password on the command-line is insecure. Consider using -P instead. 
13/02/14 16:17:09 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset. 
13/02/14 16:17:09 INFO tool.CodeGenTool: Beginning code generation 
13/02/14 16:17:09 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `tbl_2` AS t LIMIT 1 
13/02/14 16:17:09 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `tbl_2` AS t LIMIT 1 
13/02/14 16:17:09 INFO orm.CompilationManager: HADOOP_HOME is /home/yoonhok/development/hadoop-1.1.1 
Note: /tmp/sqoop-yoonhok/compile/45dd1a113123726796a4ed4ce10c9110/tbl_2.java uses or overrides a deprecated API. 
Note: Recompile with -Xlint:deprecation for details. 
13/02/14 16:17:10 INFO orm.CompilationManager: Writing jar file: /tmp/sqoop-yoonhok/compile/45dd1a113123726796a4ed4ce10c9110/tbl_2.jar 
13/02/14 16:17:10 INFO mapreduce.ExportJobBase: Beginning export of tbl_2 
13/02/14 16:17:10 WARN mapreduce.ExportJobBase: Input path file:/user/hive/warehouse/tbl_2 does not exist 
13/02/14 16:17:11 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable 
13/02/14 16:17:11 INFO mapred.JobClient: Cleaning up the staging area file:/tmp/hadoop-yoonhok/mapred/staging/yoonhok314601126/.staging/job_local_0001 
13/02/14 16:17:11 ERROR security.UserGroupInformation: PriviledgedActionException as:yoonhok cause:org.apache.hadoop.mapreduce.lib.input.InvalidInputException: Input path does not exist: file:/user/hive/warehouse/tbl_2 
13/02/14 16:17:11 ERROR tool.ExportTool: Encountered IOException running export job: org.apache.hadoop.mapreduce.lib.input.InvalidInputException: Input path does not exist: file:/user/hive/warehouse/tbl_2

我认为出口是个问题。
我使用“/user/hive/warehouse/tbl\u 2”。
当我运行“hadoopfs-ls/user/hive/warehouse/”时，表“tbl2”就存在了。
我认为
“输入路径不存在：文件：/user/hive/warehouse/tbl\u 2”不正常。
“输入路径不存在：hdfs:/user/hive/warehouse/tbl\u 2”正常。
但我不知道该怎么修。
在我得到提示之前。
我编辑了“导出目录”

--export-dir   hdfs://localhost:9000/user/hive/warehouse/tbl_2

但是。。。这是个错误。。。t、 t型

13/02/15 15:17:20 WARN tool.BaseSqoopTool: Setting your password on the command-line is insecure. Consider using -P instead.
13/02/15 15:17:20 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset.
13/02/15 15:17:20 INFO tool.CodeGenTool: Beginning code generation
13/02/15 15:17:20 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `tbl_2` AS t LIMIT 1
13/02/15 15:17:20 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `tbl_2` AS t LIMIT 1
13/02/15 15:17:20 INFO orm.CompilationManager: HADOOP_HOME is /home/yoonhok/development/hadoop-1.1.1/libexec/..
Note: /tmp/sqoop-yoonhok/compile/697590ee9b90c022fb8518b8a6f1d86b/tbl_2.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
13/02/15 15:17:22 INFO orm.CompilationManager: Writing jar file: /tmp/sqoop-yoonhok/compile/697590ee9b90c022fb8518b8a6f1d86b/tbl_2.jar
13/02/15 15:17:22 INFO mapreduce.ExportJobBase: Beginning export of tbl_2
13/02/15 15:17:22 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
13/02/15 15:17:23 INFO input.FileInputFormat: Total input paths to process : 1
13/02/15 15:17:23 INFO input.FileInputFormat: Total input paths to process : 1
13/02/15 15:17:23 INFO mapred.JobClient: Cleaning up the staging area file:/tmp/hadoop-yoonhok/mapred/staging/yoonhok922915382/.staging/job_local_0001
13/02/15 15:17:23 ERROR security.UserGroupInformation: PriviledgedActionException as:yoonhok cause:java.io.FileNotFoundException: File /user/hive/warehouse/tbl_2/000000_0 does not exist.
13/02/15 15:17:23 ERROR tool.ExportTool: Encountered IOException running export job: java.io.FileNotFoundException: File /user/hive/warehouse/tbl_2/000000_0 does not exist.

当我检查hdfs时，

hadoop fs -ls /user/hive/warehouse/tbl_2

或

hadoop fs -ls hdfs://localhost:9000/user/hive/warehouse/tbl_2

文件不存在。
-rw-r--r--1 yoonhok超群14029022 2013-02-15 12:16/user/hive/warehouse/tbl\u 2/000000\u 0
我在终端中尝试shell命令

sqoop-export --connect jdbc:mysql://localhost/detector --table tbl_2 --export-dir hdfs://localhost:9000/user/hive/warehouse/tbl_2 --username yoonhok --password 1234

这是工作。
有什么问题吗？
我不知道。
你能帮我吗？