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shell判断hdfs文件目录是否存在

2014-08-27 20:47 483 查看
hadoop有提供相应的脚本去验证文件目录是否存在的：

-bash-3.2$ hadoop fs -help
...
-test -[defsz] <path>:	Answer various questions about <path>, with result via exit status.
		  -d  return 0 if <path> is a directory.
		  -e  return 0 if <path> exists.
		  -f  return 0 if <path> is a file.
		  -s  return 0 if file <path> is greater than zero bytes in size.
		  -z  return 0 if file <path> is zero bytes in size.
		else, return 1.


测试的hdfs目录中：

-bash-3.2$ hadoop fs -ls /user/hive/warehouse/yhd_gmv_month
Found 3 items
drwxr-xr-x   - deploy supergroup          0 2014-08-25 11:15 /user/hive/warehouse/yhd_gmv_month/ds=2014-08-24
drwxr-xr-x   - deploy supergroup          0 2014-08-26 13:02 /user/hive/warehouse/yhd_gmv_month/ds=2014-08-25
drwxr-xr-x   - deploy supergroup          0 2014-08-27 08:09 /user/hive/warehouse/yhd_gmv_month/ds=2014-08-26


检验昨天产生的目录是否产生的shell脚本：

yesterday=$(date -d '-1 day' '+%Y-%m-%d')
hadoop fs -test -e /user/hive/warehouse/yhd_gmv_month/ds=$yesterday
if [ $? -eq 0 ] ;then
	echo 'exist'
else
	echo 'Error! Directory is not exist'
fi


验证存在的输出结果如下：

-bash-3.2$ hadoop fs -test -e /user/hive/warehouse/yhd_gmv_month/ds=$yesterday
if [ $? -eq 0 ] ;then
	echo 'exist'
else
	echo 'Error! Directory is not exist Or Zero bytes in size'
fi
-bash-3.2$ if [ $? -eq 0 ] ;then
> echo 'exist'
> else
> echo 'Error! Directory is not exist Or Zero bytes in size'
> fi
exist
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