Edit the ReplicaReplacement value of Seaweedfs's dat file.

rewrite_rp.py

import sys
import mmap

# usage:
# $ python3 rewrite_rp.py 1.dat 001

with open(sys.argv[1], 'rb+') as f:
    with mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_WRITE) as m:
        (curr_rp, new_rp) = (m[1], int(sys.argv[2]))
        print("{0:03d} -> {1:03d}".format(curr_rp, new_rp))
        m[1] = new_rp