首页 > 代码库 > 使用sqoop从mysql往hive中增量导数据shell脚本

使用sqoop从mysql往hive中增量导数据shell脚本

一:sqoop增量导入的两种方式

Incremental import arguments:

ArgumentDescription
--check-column (col)Specifies the column to be examined when determining which rows to import. (the column should not be of type CHAR/NCHAR/VARCHAR/VARNCHAR/ LONGVARCHAR/LONGNVARCHAR)
--incremental (mode)Specifies how Sqoop determines which rows are new. Legal values for mode include append and lastmodified.
--last-value (value)Specifies the maximum value of the check column from the previous import.

此处采用的--increamental append方式,这种方式需注意主键或split-colunm是递增,否则建议在关系表中增加一个createTime字段,采用lastmodified方式。

 

二:shell脚本

    

 1 #!/bin/sh 2 export SQOOP_HOME=/usr/share/sqoop-1.4.4 3 hostname="192.168.1.199" 4 user="root" 5 password="root" 6 database="test" 7 table="tags" 8 curr_max=0 9 10 function db_to_hive(){11 12     ${SQOOP_HOME}/bin/sqoop import --connect jdbc:mysql://${hostname}/${database} --username ${user} --password ${password}  --table ${table}   --split-by docid --hive-import --hive-table lan.ding  13  --fields-terminated-by \t --incremental  append  --check-column docid --last-value ${curr_max}   14     result=`mysql -h${hostname} -u${user} -p${password} ${database}<<EOF 15 select max(docid) from ${table};16 EOF`17 curr_max=`echo $result |awk {print $2}`18 }19 20 if [ $# -eq 0 ];then21     while true22     do23       db_to_hive24       sleep 12025     done26     exit27 fi

每隔2分钟,就往hive中增量导入数据。