Question

我想将数据从Mysql导入到HDFS Sqoop2

我的表格似乎是

CREATE TABLE `campaign` (
  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `name` varchar(128) NOT NULL,
   PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

我创建了2个链接

sqoop:000> show link
+----+-------+--------------+------------------------+---------+
| Id | Name  | Connector Id |     Connector Name     | Enabled |
+----+-------+--------------+------------------------+---------+
| 2  | hdfs  | 3            | hdfs-connector         | true    |
| 7  | mysql | 1            | generic-jdbc-connector | true    |
+----+-------+--------------+------------------------+---------+

我用

创造了工作

Table SQL statement: SELECT id, name FROM campaign WHERE ${CONDITIONS}

我也试过这个sql语句 - 它也没有工作

Table SQL statement: SELECT cast(id as UNSIGNED INTEGER) id, name FROM campaign WHERE ${CONDITIONS}

我的工作看起来像：

sqoop:000> show job
+----+-----------------+----------------+--------------+---------+
| Id |      Name       | From Connector | To Connector | Enabled |
+----+-----------------+----------------+--------------+---------+
| 4  | campaign_import | 1              | 3            | true    |
+----+-----------------+----------------+--------------+---------+

我已成功完成这项工作

sqoop:000> start job -j 4

然后我在我的映射器上发现错误

引起：java.lang.ClassCastException：java.math.BigInteger不能在
转换为java.lang.Long

错误的全文如下

Error: org.apache.sqoop.common.SqoopException: MAPRED_EXEC_0017:Error occurs during extractor run at org.apache.sqoop.job.mr.SqoopMapper.run(SqoopMapper.java:99) at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:793) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341) at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1917) at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158) Caused by: java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.lang.Long at org.apache.sqoop.connector.common.SqoopIDFUtils.toCSVFixedPoint(SqoopIDFUtils.java:133) at org.apache.sqoop.connector.common.SqoopIDFUtils.toCSV(SqoopIDFUtils.java:588) at org.apache.sqoop.connector.idf.CSVIntermediateDataFormat.toCSV(CSVIntermediateDataFormat.java:116) at org.apache.sqoop.connector.idf.CSVIntermediateDataFormat.setObjectData(CSVIntermediateDataFormat.java:87) at org.apache.sqoop.job.mr.SqoopMapper$SqoopMapDataWriter.writeArrayRecord(SqoopMapper.java:125) at org.apache.sqoop.connector.jdbc.GenericJdbcExtractor.extract(GenericJdbcExtractor.java:96) at org.apache.sqoop.connector.jdbc.GenericJdbcExtractor.extract(GenericJdbcExtractor.java:38) at org.apache.sqoop.job.mr.SqoopMapper.run(SqoopMapper.java:95) ... 7 more

id类型（bigint）看起来像campaign表中的问题，但我不知道如何在不更改此字段类型的情况下修复它：）

也许，有人有任何想法吗？

Answer 1

当我将Table SQL语句更改为

时，它对我有用

SELECT cast(id as SIGNED INTEGER) id, name FROM campaign WHERE ${CONDITIONS}

我仔细观察并看到了

1）使用表SQL语句：SELECT id, name FROM campaign WHERE ${CONDITIONS}我发现了错误：

引起：java.lang.ClassCastException：java.math.BigInteger不能被强制转换为java.lang.Long

2）使用表SQL语句：SELECT cast(id as UNSIGNED INTEGER) id, name FROM campaign WHERE ${CONDITIONS}我发现了错误：

引起：java.lang.ClassCastException：java.lang.Long无法强制转换到java.lang.Integer

问题在于投射，我需要将BIGINT投射到SIGNED INTEGER

Sqoop2无法使用＆＃34从mysql导入到hdfs;引起：java.lang.ClassCastException：java.math.BigInteger无法强制转换为java.lang.Long＆＃34;

1 个答案: