Hadoop Namenode backup solution

#!/bin/bash -l

# Backup the filesytem for hadoop
# Replace NAMENODE by your namenode IP or its lookup name

today=$(date +"%Y-%m-%d-%H%M")

cd /home/hdfs/backup/

wget http://NAMENODE:50070/getimage?getimage=1 -O fsimage -nv
if [ $? -eq 0 ]; then
    wget http://NAMENODE:50070/getimage?getedit=1 -O edits -nv
    if [ $? -eq 0 ]; then
        tar -zcf namenode-$today.tar.gz fsimage edits
        if [ $? -eq 0 ]; then
            # delete all backup up to 3days
            find -atime +3 -name 'namenode*' -exec rm {} \;
            rm fsimage
            rm edits
        fi
    else
        rm fsimage
        exit 4;
    fi
fi