Delete files older than 10days on HDFS

Question

Is there a way to delete files older than 10 days on HDFS?

In Linux I would use:

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


        

Answer 1

I attempted to implement the accepted solution above.

Unfortunately, it only partially worked for me. I ran into 3 real world problems.

First, hdfs didn't have enough RAM to load up and print all the files.

Second, even when hdfs could print all the files awk could only handle ~8300 records before it broke.

Third, the performance was abysmal. When implemented it was deleting ~10 files per minute. This wasn't useful because I was generating ~240 files per minute.

So my final solution was this:

tmpfile=$(mktemp)
HADOOP_CLIENT_OPTS="-Xmx2g" hdfs dfs -ls /path/to/directory    |   tr -s " "    |    cut -d' ' -f6-8    |     grep "^[0-9]"    |    awk 'BEGIN{ MIN=35*24*60; LAST=60*MIN; "date +%s" | getline NOW } { cmd="date -d'\''"$1" "$2"'\'' +%s"; cmd | getline WHEN; DIFF=NOW-WHEN; if(DIFF > LAST){ print $3}}; close(cmd);' > $tmpfile
hdfs dfs -rm -r $(cat $tmpfile)
rm "$tmpfile"

I don't know if there are additional limits on this solution but it handles 50,000+ records in a timely fashion.

EDIT: Interestingly, I ran into this issue again and on the remove, I had to batch my deletes as hdfs rm statement couldn't take more than ~32,000 inputs.

Answer 2

Yes, you can try with HdfsFindTool:

hadoop jar /opt/cloudera/parcels/CDH/lib/solr/contrib/mr/search-mr-job.jar \
  org.apache.solr.hadoop.HdfsFindTool \
  -find /pathhodir -mtime +10 -name ^.*\.txt$ \
  | xargs hdfs dfs -rm -r -skipTrash

Answer 3

hdfs dfs -ls -t /file/Path|awk -v dateA="$date" '{if ($6" "$7 < {target_date}) {print ($8)}}'|xargs -I% hdfs dfs -rm "%" /file/Path

Answer 4

Solution 1: Using multiple commands as answered by daemon12

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) }}'

Solution 2: Using 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

Answer 5

How about this:

hdfs dfs -ls /tmp    |   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) }}'

A detailed description is here.