我在sqoop 找到我的表的上限值时遇到问题。它必须是203，但它的结果为null ，因此查询（粗体）是错误的。
hduser@hduser:~$ sudo -u hdfs sqoop job --create testora -- import --connect jdbc:oracle:thin:@192.168.1.6:1521/DB --username SYSTEM -password Welcome123 --table employees --columns "emp_id,emp_name,emp_salary" --check-column "emp_id" --incremental "append" --last-value "200" --hive-table=oraemployees --hive-import --split-by "emp_id" --target-dir /user/hdfs/oraemployees;
13/04/15 17:35:46 WARN tool.BaseSqoopTool: Setting your password on the command-line is insecure. Consider using -P instead.
13/04/15 17:35:46 INFO tool.BaseSqoopTool: Using Hive-specific delimiters for output. You can override
13/04/15 17:35:46 INFO tool.BaseSqoopTool: delimiters with --fields-terminated-by, etc.
flutura@flutura:~$ sudo -u hdfs sqoop job --exec testora10
13/04/15 17:35:51 INFO manager.SqlManager: Using default fetchSize of 1000
13/04/15 17:35:51 INFO tool.CodeGenTool: Beginning code generation
13/04/15 17:35:52 INFO manager.OracleManager: Time zone has been set to GMT
13/04/15 17:35:52 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM employees t WHERE 1=0
13/04/15 17:35:52 INFO orm.CompilationManager: HADOOP_HOME is /usr/lib/hadoop
13/04/15 17:35:52 INFO orm.CompilationManager: Found hadoop core jar at: /usr/lib/hadoop/hadoop-core.jar
13/04/15 17:35:52 INFO orm.CompilationManager: Writing jar file: /tmp/sqoop-hdfs/compile/a85f9eb2e63c0150ce13f684dfab16ff/employees.jar
13/04/15 17:35:52 INFO tool.ImportTool: Incremental import based on column emp_id
13/04/15 17:35:52 INFO tool.ImportTool: **Lower bound value: 200**
13/04/15 17:35:52 INFO tool.ImportTool: **Upper bound value: null**
13/04/15 17:35:52 INFO mapreduce.ImportJobBase: Beginning import of employees
13/04/15 17:35:53 INFO db.DataDrivenDBInputFormat: BoundingValsQuery: **SELECT MIN(emp_id), MAX(emp_id) FROM employees WHERE ( emp_id > 200 AND emp_id IS NULL )**
13/04/15 17:35:53 INFO mapred.JobClient: Running job: job_201304151528_0010
13/04/15 17:35:54 INFO mapred.JobClient: map 0% reduce 0%
13/04/15 17:35:59 INFO mapred.JobClient: map 100% reduce 0%
13/04/15 17:35:59 INFO mapred.JobClient: Job complete: job_201304151528_0010
13/04/15 17:35:59 INFO mapred.JobClient: Counters: 15
13/04/15 17:35:59 INFO mapred.JobClient: Job Counters
13/04/15 17:35:59 INFO mapred.JobClient: SLOTS_MILLIS_MAPS=3881
13/04/15 17:35:59 INFO mapred.JobClient: Total time spent by all reduces waiting after reserving slots (ms)=0
13/04/15 17:35:59 INFO mapred.JobClient: Total time spent by all maps waiting after reserving slots (ms)=0
13/04/15 17:35:59 INFO mapred.JobClient: Launched map tasks=1
13/04/15 17:35:59 INFO mapred.JobClient: SLOTS_MILLIS_REDUCES=0
13/04/15 17:35:59 INFO mapred.JobClient: FileSystemCounters
13/04/15 17:35:59 INFO mapred.JobClient: HDFS_BYTES_READ=109
13/04/15 17:35:59 INFO mapred.JobClient: FILE_BYTES_WRITTEN=72408
13/04/15 17:35:59 INFO mapred.JobClient: Map-Reduce Framework
13/04/15 17:35:59 INFO mapred.JobClient: Map input records=0
13/04/15 17:35:59 INFO mapred.JobClient: Physical memory (bytes) snapshot=125415424
13/04/15 17:35:59 INFO mapred.JobClient: Spilled Records=0
13/04/15 17:35:59 INFO mapred.JobClient: CPU time spent (ms)=500
13/04/15 17:35:59 INFO mapred.JobClient: Total committed heap usage (bytes)=200998912
13/04/15 17:35:59 INFO mapred.JobClient: Virtual memory (bytes) snapshot=1019650048
13/04/15 17:35:59 INFO mapred.JobClient: Map output records=0
13/04/15 17:35:59 INFO mapred.JobClient: SPLIT_RAW_BYTES=109
13/04/15 17:35:59 INFO mapreduce.ImportJobBase: Transferred 0 bytes in 7.2782 seconds (0 bytes/sec)
13/04/15 17:35:59 INFO mapreduce.ImportJobBase: Retrieved 0 records.
13/04/15 17:36:00 INFO util.AppendUtils: Creating missing output directory - oraemployees10
13/04/15 17:36:00 INFO manager.OracleManager: Time zone has been set to GMT
13/04/15 17:36:00 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM employees t WHERE 1=0
13/04/15 17:36:00 ERROR sqoop.Sqoop: Got exception running Sqoop: java.lang.NullPointerException
java.lang.NullPointerException
at com.cloudera.sqoop.hive.TableDefWriter.getCreateTableStmt(TableDefWriter.java:177)
at com.cloudera.sqoop.hive.HiveImport.importTable(HiveImport.java:175)
at com.cloudera.sqoop.tool.ImportTool.importTable(ImportTool.java:394)
at com.cloudera.sqoop.tool.ImportTool.run(ImportTool.java:455)
at com.cloudera.sqoop.tool.JobTool.execJob(JobTool.java:233)
at com.cloudera.sqoop.tool.JobTool.run(JobTool.java:288)
at com.cloudera.sqoop.Sqoop.run(Sqoop.java:146)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at com.cloudera.sqoop.Sqoop.runSqoop(Sqoop.java:182)
at com.cloudera.sqoop.Sqoop.runTool(Sqoop.java:221)
at com.cloudera.sqoop.Sqoop.runTool(Sqoop.java:230)
at com.cloudera.sqoop.Sqoop.main(Sqoop.java:239)