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fixed a few problems with redis-trib resharding.

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antirez 2011-10-01 01:31:46 +02:00
parent a0189bbe75
commit 7112580cb3
1 changed files with 28 additions and 10 deletions
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38
src/redis-trib.rb
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@ -1,11 +1,25 @@
#!/usr/bin/env ruby
# TODO (temporary here, we'll move this into the Github issues once redis-trib initial
# implementation is complted).
# TODO (temporary here, we'll move this into the Github issues once
# redis-trib initial implementation is complted).
#
# - Make sure that if the rehashing fails in the middle redis-trib will try to recover.
# - When redis-trib performs a cluster check, if it detects a slot move in progress it
# should prompt the user to continue the move from where it stopped.
# - Make sure that if the rehashing fails in the middle redis-trib will try
# to recover.
# - When redis-trib performs a cluster check, if it detects a slot move in
# progress it should prompt the user to continue the move from where it
# stopped.
# - Gracefully handle Ctrl+C in move_slot to prompt the user if really stop
# while rehashing, and performing the best cleanup possible if the user
# forces the quit.
# - When doing "fix" set a global Fix to true, and prompt the user to
# fix the problem if automatically fixable every time there is something
# to fix. For instance:
# 1) If there is a node that pretend to receive a slot, or to migrate a
# slot, but has no entries in that slot, fix it.
# 2) If there is a node having keys in slots that are not owned by it
# fix this condiiton moving the entries in the same node.
# 3) Perform more possibly slow tests about the state of the cluster.
# 4) When aborted slot migration is detected, fix it.
require 'rubygems'
require 'redis'
@ -81,7 +95,9 @@ class ClusterNode
nodes = @r.cluster("nodes").split("\n")
nodes.each{|n|
# name addr flags role ping_sent ping_recv link_status slots
name,addr,flags,role,ping_sent,ping_recv,link_status,slots = n.split(" ")
split = n.split
name,addr,flags,role,ping_sent,ping_recv,link_status = split[0..6]
slots = split[7..-1]
info = {
:name => name,
:addr => addr,
@ -94,8 +110,10 @@ class ClusterNode
if info[:flags].index("myself")
@info = @info.merge(info)
@info[:slots] = {}
slots.split(",").each{|s|
if s.index("-")
slots.each{|s|
if s[0..0] == '['
# Fixme: for now skipping migration entries
elsif s.index("-")
start,stop = s.split("-")
self.add_slots((start.to_i)..(stop.to_i))
else
@ -171,7 +189,7 @@ class ClusterNode
x.count == 1 ? x.first.to_s : "#{x.first}-#{x.last}"
}.join(",")
"[#{@info[:cluster_state].upcase}] #{self.info[:name]} #{self.to_s.ljust(25)} slots:#{slots}"
"[#{@info[:cluster_state].upcase}] #{self.info[:name]} #{self.to_s} slots:#{slots} (#{self.slots.length} slots)"
end
def info
@ -330,7 +348,7 @@ class RedisTrib
# and the slot as migrating in the target host. Note that the order of
# the operations is important, as otherwise a client may be redirected to
# the target node that does not yet know it is importing this slot.
print "Moving slot #{slot}: "; STDOUT.flush
print "Moving slot #{slot} from #{source.info_string}: "; STDOUT.flush
target.r.cluster("setslot",slot,"importing",source.info[:name])
source.r.cluster("setslot",slot,"migrating",source.info[:name])
# Migrate all the keys from source to target using the MIGRATE command