Hadoop HDFS How to delete old files from HDFS

Question

I want to delete older files from hdfs, say files that are older than 10 days. If I had to do this in linux, I would do something like this:

find /path/to/directory/ -type f -mtime +10 -name '*.txt' -execdir rm -- {} \;

So how to do this for hdfs?

Answer 1

You can use commands like this:

hdfs dfs -ls /file/Path    |   tr -s " "    |    cut -d' ' -f6-8    |     grep "^[0-9]"    |    awk 'BEGIN{ MIN=14400; LAST=60*MIN; "date +%s" | getline NOW } { cmd="date -d'\''"$1" "$2"'\'' +%s"; cmd | getline WHEN; DIFF=NOW-WHEN; if(DIFF > LAST){ print "Deleting: "$3; system("hdfs dfs -rm -r "$3) }}'

Or you can use shell script:

today=`date +'%s'`
hdfs dfs -ls /file/Path/ | grep "^d" | while read line ; do
dir_date=$(echo ${line} | awk '{print $6}')
difference=$(( ( ${today} - $(date -d ${dir_date} +%s) ) / ( 24*60*60 ) ))
filePath=$(echo ${line} | awk '{print $8}')

if [ ${difference} -gt 10 ]; then
    hdfs dfs -rm -r $filePath
fi
done