hive等常用语句

1.查看hadoop任务

yarn application -list |grep 用户名yarn application -kill application_1443009203033_86621

2.liunx nohup命令

nohup ./label_driver.sh > /home/disk4/bi/driver_label/label_driver20150325.log  2>&1 &nohup ./testpass.sh > logs/testpass_20150323.log  2>&1 &

3.hive添加字段

ALTER TABLE label_driver_z add columns(total_miss_cnt int comment '累积爽约订单数');

4.hive修改表分隔方式、修改空值描述符

ALTER TABLE city SET SERDEPROPERTIES ('field.delim' = '\t');ALTER TABLE city SET SERDEPROPERTIES('serialization.format' = '\t');ALTER TABLE city SET SERDEPROPERTIES('serialization.null.format' = '');ALTER TABLE dm_market_acti_reg_d CHANGE dt dt int COMMENT '业务日期' FIRST boci;ALTER TABLE employee RENAME TO emp;ALTER TABLE dm_market_boci_first_call_d add COLUMNS (dt int comment '业务日期');ALTER TABLE dw_customer add COLUMNS (ord_succ_d int comment '当日完成订单数');

5.hive查看函数的用法

desc function extended add_months;

6.hive查看表存储实际路径

desc extended ods_order partition(dt=20151010);

7.hive insert语法

insert OVERWRITE table test_an select 11111111111,'a' from label_driver_basic limit 1;mysql -uhive -p'xiaojukeji' -hhdp999.qq -P3306 --default-character-set=utf8 test

8.不开启优化

set hive.fetch.task.conversion=minimal,moreset hive.exec.parallel=true;

9.查看使用的分区

explain dependency query_str

10.删除文件

hadoop fs -rmr /user/rd/bi_dm/dm_tag_pass_ord_tot_d;dfs -rmr /user/rd/bi_dm/app_driver_ord_distri_d;

11.hive选择执行引擎

set hive.execution.engine=tez,spark,mrset mapred.reduce.tasks=20;

12.手机号码正则表达式

'^1[35847][0-9]{9}$'

13.查找某个文件

find . -name app_tag_pass1_info.sh

14.COALESCE( value1,value2,… )

17.hive删除分区

ALTER TABLE login DROP IF EXISTS PARTITION (dt='2008-08-08');

19.hive下载目录

http://archive.apache.org/dist/hive/

20.压缩命令

tar -cvf /tmp/etc.tar /etc

21.改变文件目录权限

chown -R xiaoju  /home/disk1/tagol-data/weather/chgrp -R xiaoju  /home/disk1/tagol-data/weather/

22.启动langley

nohup /data/xiaoju/langley/srv/bin/langley_srv 9001 /data1 &

23.取文本第及列数据

cat test|awk '{print $2}'awk '{print $1}' dw_pass_tagol_a_20150708.csv > tagol.csv