shell判斷hdfs檔案目錄是否存在
阿新 • • 發佈：2019-01-02
hadoop有提供相應的指令碼去驗證檔案目錄是否存在的：
-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.
測試的hdfs目錄中：
-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
檢驗昨天產生的目錄是否產生的shell指令碼：
yesterday=$(date -d '-1 day' '+%Y-%m-%d')
hadoop fs -test -e /user/hive/warehouse/yhd_gmv_month/ds=$yesterday
if [ $? -eq 0 ] ;then
echo 'exist'
else
echo 'Error! Directory is not exist'
fi驗證存在的輸出結果如下：
-bash-3.2$ 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