集群间 Hive 数据 迁移 问题
1、 从hive中导出数据至本地目录 insert overwrite local directory /export/tmp select * from test1 where create_time = 2013-11-25; 列数据之间默认以^A隔开。 2、将本地数据上传另一个集群的hdfs /home/q/hadoop-2.2.0/bin/hdfs dfs -put /export/tmp hd
1、 从hive中导出数据至本地目录 insert overwrite local directory '/export/tmp' select * from test1 where create_time = '2013-11-25'; 列数据之间默认以^A隔开。 2、将本地数据上传另一个集群的hdfs /home/q/hadoop-2.2.0/bin/hdfs dfs -put /export/tmp hdfs://host:port/tmp 3、将hdfs中的数据文件导入hive表中 hive -e "load data inpath '/tmp' into table test1;" 但某些表创建时,设置的以 '\t' 分割数据,在读取不到 '\t' 时,会将整行数据都导入第一列。 如果是hive-0.11.0版本,可以这样导出:hive> insert overwrite local directory '/export/tmp' hive> row format delimited hive> fields terminated by '\t' hive> select * from test1 where create_time = '2013-11-25';
如果是低版本的hive,只好将导出的数据文件中的^A,替换为'\t':
sed -i 's/^A/\t/g' filename
同时需要将隐藏的.filename.crc校验文件删除掉,不然在上传的过程中,Hadoop将通过FSInputChecker判断需要上传的文件是否存在进行校验的crc文件,即.filename.crc,如果存在crc文件,将会对其内容一致性进行校验,如果校验 失败,会报fs.FSInputChecker: Found checksum error,停止上传该文件,最终导致整个MR任务无法执行。

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