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我已经使用 --as-sequencefile 选项将一个表从 MySql 导入到 HDFS 中。然后，我创建了一个带有 STORED AS SEQUENCEFILE 子句和 LOCATION 子句的 Hive 表，它指向 Sqoop 导入的序列文件所在的 HDFS 位置。

Sqoop 导入命令：

sqoop import --connect jdbc:mysql://sandbox.hortonworks.com:3306/hirw --username root --password hadoop --table stocks -m 2 --as-sequencefile  --target-dir /user/root/output/hirw/sqoopimport/stocks_seq --delete-target-dir

Hive 表创建

CREATE TABLE stocks_sqoop_seq (id int, symbol string, name string, trade_date date, close_price float, volume int, update_time timestamp)  STORED AS SEQUENCEFILE LOCATION '/user/root/output/hirw/sqoopimport/stocks_seq';

当我现在尝试查询表时，它失败并出现异常

Failed with exception java.io.IOException:java.lang.RuntimeException: java.io.IOException: WritableName can't load class: stocks

我错过了什么吗

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1 回答 1

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您还必须声明输入和输出格式。像这样创建表：

CREATE TABLE stocks_sqoop_seq (
  id int, symbol string, 
  name string, trade_date date, 
  close_price float, volume int, 
  update_time timestamp)  
STORED AS SEQUENCEFILE 
STORED AS INPUTFORMAT 'org.apache.hadoop.mapred.SequenceFileInputFormat'
OUTPUTFORMAT 'org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat'
LOCATION '/user/root/output/hirw/sqoopimport/stocks_seq'\;
于 2016-06-06T08:44:35.893 回答