hadoop-replication written flow
w:net write
r :net read(correspond to net write)
wl:write locally,ie. fs write
cost time:t4-t0=1 client w+2 DN w+ 1 DN wl~3w + 1wl ~ 1wl (assume disk write is bottle neck)
w:net write
r :net read(correspond to net write)
wl:write locally,ie. fs write
cost time:t4-t0=1 client w+2 DN w+ 1 DN wl~3w + 1wl ~ 1wl (assume disk write is bottle neck)