hadoop的Linux操作

初学hadoop之linux系统操作的hdfs的常用命令

Hadoop之HDFS文件操作

Hadoop fs命令详解

官网doc

sudo su - hdfs：免密，以hdfs账户登陆。可操作hdfs文件

logout

sudo su - root

hadoop fs -ls /

rm -rf  目录名

sh dvm_auto_hive_ci_test.sh 2017-11-22 2017-11-22 criteo

hadoop fs -get  /report/dvm_test/script/bashScript

ls -l ：查看文件权限

chmod 777mm.txt：修改文件权限

cat criteo.log:查看文件

 sh dvm_auto_hive_criteoTransaction_test.sh -d "2017-11-22" -P "criteoTransaction" --input-folder "/report/dvm_test/naa" --hdfs-script "/report/dvm_test/script/etl"

hadoop fs -rmdir /tmp/out/report/dvm_test/naa/TransactionCriteo/2017/11

hadoop jar "/usr/hdp/2.6.2.0-205/hadoop-mapreduce/hadoop-streaming-2.7.3.2.6.2.0-205.jar" -input "/report/dvm_test/naa/TransactionCriteo/2017/11/22" -output "/tmp/out/report/dvm_test/naa/TransactionCriteo/2017/11/22" -mapper "python /report/dvm_test/script/etl/TransactionCriteo_naa_map.py" -reducer NONE

truncate table table_name;

DROP TABLE [IF EXISTS] table_name;

ALTER TABLE myTable DROP IF EXISTS PARTITION
(date>='date1' and date<='date2');

ALTER TABLE myTable DROP IF EXISTS PARTITION
(date>='date1' && date<='date2');

ALTER TABLE myTable DROP IF EXISTS PARTITION
(date between 'date1' and 'date2');

update partition：

ALTER TABLE logs PARTITION(year = 2012, month = 12, day = 18) 
SET LOCATION 'hdfs://user/darcy/logs/2012/12/18';




drop a partition：

ALTER TABLE logs DROP IF EXISTS PARTITION(year = 2012, month = 12, day = 18);



 I implemented a workaround for this issue using some shell scripts, like for instance:

for y in {2011..2014} 
do 
  for m in {01..12}
  do 
    echo -n "ALTER TABLE reporting.frontend DROP IF EXISTS PARTITION (year=0000,month=00,day=00,hour=00)" 
    for d in {01..31}
    do 
      for h in {01..23}
      do 
        echo -n ", PARTITION (year=$y,month=$m,day=$d,hour=$h)" 
      done
    done
    echo ";"
  done
done > drop_partitions_v1.hql

The resulting .hql file can be simply executed by using the hive (or beeline) -f option.

Obviously the loops should be able to generate the range you want to drop, which might be nontrivial. In the worst case you will need to use several such shell scripts in order to drop the desired range of dates.

Further, please note that in my case the partitions had four keys (year, month, day, hour). If your dates/partitions are coded as strings (not a good idea in my opinion), you will have to 'build' your target string out of the variables y, m, d and h in the shell script, and plot the string inside the echo command. By the way, the dummy partition (containing only 0s) is just there in order to write easily by means of 3-4 loops the whole 'ALTER TABLE' command, which has a special syntax.