通过创建临时表合并hive小文件

#!/bin/bash
#set -x

DB=$1

#获取hive表定义
ret=$(hive -e "use ${DB};show tables;"|grep -v _es|grep -v _hb|grep -v importinfo)

for tem in $ret;
do
    echo ${tem}_tmp
    hive -e "use ${DB};drop table ${tem}_tmp"
    hive -e "use ${DB};create table ${tem}_tmp_1 as select * from ${tem}"
    hive -e "use ${DB};alter table ${tem} rename to ${tem}_tmp"
    hive -e "use ${DB};alter table ${tem}_tmp_1 rename to ${tem}"
done

impala-shell -q 'invalidate metadata' -i hslave1
#使用了impala所以要更新