一.准备工作
1.准备一个redis，删除目录下的，dump.rdb文件，并修改他的配置文件：redis.windows.conf
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1.修改端口：我设置为 port 70012.放开配置： cluster-enabled yes cluster-config-file nodes-7001.conf //名称可自改 cluster-node-timeout 15000 |
将这个redis复制5份，并修改相应配置，将端口设置为：7001,7002,7003,7004,7005,7006
2.配置ruby环境、redis的ruby驱动redis.gem以及创建redis集群的工具redis-trib.rb。
（1）下载redis安装文件：http://download.redis.io/releases/，我们下载zip格式redis-x64-3.2.1版本。
（2）下载ruby安装文件：http://dl.bintray.com/oneclick/rubyinstaller/rubyinstaller-2.2.4-x64.exe
（3）下载ruby环境下redis的驱动：https://rubygems.org/gems/redis/versions/3.2.2，考虑到兼容性，这里下载的是3.2.2版本。
下载：https://rubygems.org/downloads/redis-3.2.2.gem
（4）下载redis官方提供的创建redis集群的ruby脚本文件redis-trib.rb；（我自己下载的，在文章最后，自用）
3.将所有redis文件和redis-trib.rb放在一个redis目录下：
二.启动redis群
1.在redis-trib.rb目录下输入:后面会出现选项，选yes即可；
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redis-trib.rb create --replicas 0 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005 127.0.0.1:7006 |
三.出现问题
1.缺少redis库:
解决方法：gem install redis （安装redis库）
2.插槽15被占用，解决方法：打开每一个服务器，执行flushall、flushdb、cluster reset指令：到每个redis目录下修改：
四.资源
redis-trib.rb：将他复制到文本上并修改文本名称即可：
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#!/usr/bin/env ruby # todo (temporary here, we'll move this into the github issues once# redis-trib initial implementation is completed).## - 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 condition 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' clusterhashslots = 16384migratedefaulttimeout = 60000migratedefaultpipeline = 10rebalancedefaultthreshold = 2 $verbose = false def xputs(s) case s[0..2] when ">>>" color="29;1" when "[er" color="31;1" when "[wa" color="31;1" when "[ok" color="32" when "[fa","***" color="33" else color=nil end color = nil if env['term'] != "xterm" print "\033[#{color}m" if color print s print "\033[0m" if color print "\n"end class clusternode def initialize(addr) s = addr.split(":") if s.length < 2 puts "invalid ip or port (given as #{addr}) - use ip:port format" exit 1 end port = s.pop # removes port from split array ip = s.join(":") # if s.length > 1 here, it's ipv6, so restore address @r = nil @info = {} @info[:host] = ip @info[:port] = port @info[:slots] = {} @info[:migrating] = {} @info[:importing] = {} @info[:replicate] = false @dirty = false # true if we need to flush slots info into node. @friends = [] end def friends @friends end def slots @info[:slots] end def has_flag?(flag) @info[:flags].index(flag) end def to_s "#{@info[:host]}:#{@info[:port]}" end def connect(o={}) return if @r print "connecting to node #{self}: " if $verbose stdout.flush begin @r = redis.new(:host => @info[:host], :port => @info[:port], :timeout => 60) @r.ping rescue xputs "[err] sorry, can't connect to node #{self}" exit 1 if o[:abort] @r = nil end xputs "ok" if $verbose end def assert_cluster info = @r.info if !info["cluster_enabled"] || info["cluster_enabled"].to_i == 0 xputs "[err] node #{self} is not configured as a cluster node." exit 1 end end def assert_empty if !(@r.cluster("info").split("\r\n").index("cluster_known_nodes:1")) || (@r.info['db0']) xputs "[err] node #{self} is not empty. either the node already knows other nodes (check with cluster nodes) or contains some key in database 0." exit 1 end end def load_info(o={}) self.connect nodes = @r.cluster("nodes").split("\n") nodes.each{|n| # name addr flags role ping_sent ping_recv link_status slots split = n.split name,addr,flags,master_id,ping_sent,ping_recv,config_epoch,link_status = split[0..6] slots = split[8..-1] info = { :name => name, :addr => addr, :flags => flags.split(","), :replicate => master_id, :ping_sent => ping_sent.to_i, :ping_recv => ping_recv.to_i, :link_status => link_status } info[:replicate] = false if master_id == "-" if info[:flags].index("myself") @info = @info.merge(info) @info[:slots] = {} slots.each{|s| if s[0..0] == '[' if s.index("->-") # migrating slot,dst = s[1..-1].split("->-") @info[:migrating][slot.to_i] = dst elsif s.index("-<-") # importing slot,src = s[1..-1].split("-<-") @info[:importing][slot.to_i] = src end elsif s.index("-") start,stop = s.split("-") self.add_slots((start.to_i)..(stop.to_i)) else self.add_slots((s.to_i)..(s.to_i)) end } if slots @dirty = false @r.cluster("info").split("\n").each{|e| k,v=e.split(":") k = k.to_sym v.chop! if k != :cluster_state @info[k] = v.to_i else @info[k] = v end } elsif o[:getfriends] @friends << info end } end def add_slots(slots) slots.each{|s| @info[:slots][s] = :new } @dirty = true end def set_as_replica(node_id) @info[:replicate] = node_id @dirty = true end def flush_node_config return if !@dirty if @info[:replicate] begin @r.cluster("replicate",@info[:replicate]) rescue # if the cluster did not already joined it is possible that # the slave does not know the master node yet. so on errors # we return asap leaving the dirty flag set, to flush the # config later. return end else new = [] @info[:slots].each{|s,val| if val == :new new << s @info[:slots][s] = true end } @r.cluster("addslots",*new) end @dirty = false end def info_string # we want to display the hash slots assigned to this node # as ranges, like in: "1-5,8-9,20-25,30" # # note: this could be easily written without side effects, # we use 'slots' just to split the computation into steps. # first step: we want an increasing array of integers # for instance: [1,2,3,4,5,8,9,20,21,22,23,24,25,30] slots = @info[:slots].keys.sort # as we want to aggregate adjacent slots we convert all the # slot integers into ranges (with just one element) # so we have something like [1..1,2..2, ... and so forth. slots.map!{|x| x..x} # finally we group ranges with adjacent elements. slots = slots.reduce([]) {|a,b| if !a.empty? && b.first == (a[-1].last)+1 a[0..-2] + [(a[-1].first)..(b.last)] else a + [b] end } # now our task is easy, we just convert ranges with just one # element into a number, and a real range into a start-end format. # finally we join the array using the comma as separator. slots = slots.map{|x| x.count == 1 ? x.first.to_s : "#{x.first}-#{x.last}" }.join(",") role = self.has_flag?("master") ? "m" : "s" if self.info[:replicate] and @dirty is = "s: #{self.info[:name]} #{self.to_s}" else is = "#{role}: #{self.info[:name]} #{self.to_s}\n"+ " slots:#{slots} (#{self.slots.length} slots) "+ "#{(self.info[:flags]-["myself"]).join(",")}" end if self.info[:replicate] is += "\n replicates #{info[:replicate]}" elsif self.has_flag?("master") && self.info[:replicas] is += "\n #{info[:replicas].length} additional replica(s)" end is end # return a single string representing nodes and associated slots. # todo: remove slaves from config when slaves will be handled # by redis cluster. def get_config_signature config = [] @r.cluster("nodes").each_line{|l| s = l.split slots = s[8..-1].select {|x| x[0..0] != "["} next if slots.length == 0 config << s[0]+":"+(slots.sort.join(",")) } config.sort.join("|") end def info @info end def is_dirty? @dirty end def r @r endend class redistrib def initialize @nodes = [] @fix = false @errors = [] @timeout = migratedefaulttimeout end def check_arity(req_args, num_args) if ((req_args > 0 and num_args != req_args) || (req_args < 0 and num_args < req_args.abs)) xputs "[err] wrong number of arguments for specified sub command" exit 1 end end def add_node(node) @nodes << node end def reset_nodes @nodes = [] end def cluster_error(msg) @errors << msg xputs msg end # return the node with the specified id or nil. def get_node_by_name(name) @nodes.each{|n| return n if n.info[:name] == name.downcase } return nil end # like get_node_by_name but the specified name can be just the first # part of the node id as long as the prefix in unique across the # cluster. def get_node_by_abbreviated_name(name) l = name.length candidates = [] @nodes.each{|n| if n.info[:name][0...l] == name.downcase candidates << n end } return nil if candidates.length != 1 candidates[0] end # this function returns the master that has the least number of replicas # in the cluster. if there are multiple masters with the same smaller # number of replicas, one at random is returned. def get_master_with_least_replicas masters = @nodes.select{|n| n.has_flag? "master"} sorted = masters.sort{|a,b| a.info[:replicas].length <=> b.info[:replicas].length } sorted[0] end def check_cluster(opt={}) xputs ">>> performing cluster check (using node #{@nodes[0]})" show_nodes if !opt[:quiet] check_config_consistency check_open_slots check_slots_coverage end def show_cluster_info masters = 0 keys = 0 @nodes.each{|n| if n.has_flag?("master") puts "#{n} (#{n.info[:name][0...8]}...) -> #{n.r.dbsize} keys | #{n.slots.length} slots | "+ "#{n.info[:replicas].length} slaves." masters += 1 keys += n.r.dbsize end } xputs "[ok] #{keys} keys in #{masters} masters." keys_per_slot = sprintf("%.2f",keys/16384.0) puts "#{keys_per_slot} keys per slot on average." end # merge slots of every known node. if the resulting slots are equal # to clusterhashslots, then all slots are served. def covered_slots slots = {} @nodes.each{|n| slots = slots.merge(n.slots) } slots end def check_slots_coverage xputs ">>> check slots coverage..." slots = covered_slots if slots.length == clusterhashslots xputs "[ok] all #{clusterhashslots} slots covered." else cluster_error \ "[err] not all #{clusterhashslots} slots are covered by nodes." fix_slots_coverage if @fix end end def check_open_slots xputs ">>> check for open slots..." open_slots = [] @nodes.each{|n| if n.info[:migrating].size > 0 cluster_error \ "[warning] node #{n} has slots in migrating state (#{n.info[:migrating].keys.join(",")})." open_slots += n.info[:migrating].keys end if n.info[:importing].size > 0 cluster_error \ "[warning] node #{n} has slots in importing state (#{n.info[:importing].keys.join(",")})." open_slots += n.info[:importing].keys end } open_slots.uniq! if open_slots.length > 0 xputs "[warning] the following slots are open: #{open_slots.join(",")}" end if @fix open_slots.each{|slot| fix_open_slot slot} end end def nodes_with_keys_in_slot(slot) nodes = [] @nodes.each{|n| next if n.has_flag?("slave") nodes << n if n.r.cluster("getkeysinslot",slot,1).length > 0 } nodes end def fix_slots_coverage not_covered = (0...clusterhashslots).to_a - covered_slots.keys xputs ">>> fixing slots coverage..." xputs "list of not covered slots: " + not_covered.join(",") # for every slot, take action depending on the actual condition: # 1) no node has keys for this slot. # 2) a single node has keys for this slot. # 3) multiple nodes have keys for this slot. slots = {} not_covered.each{|slot| nodes = nodes_with_keys_in_slot(slot) slots[slot] = nodes xputs "slot #{slot} has keys in #{nodes.length} nodes: #{nodes.join(", ")}" } none = slots.select {|k,v| v.length == 0} single = slots.select {|k,v| v.length == 1} multi = slots.select {|k,v| v.length > 1} # handle case "1": keys in no node. if none.length > 0 xputs "the folowing uncovered slots have no keys across the cluster:" xputs none.keys.join(",") yes_or_die "fix these slots by covering with a random node?" none.each{|slot,nodes| node = @nodes.sample xputs ">>> covering slot #{slot} with #{node}" node.r.cluster("addslots",slot) } end # handle case "2": keys only in one node. if single.length > 0 xputs "the folowing uncovered slots have keys in just one node:" puts single.keys.join(",") yes_or_die "fix these slots by covering with those nodes?" single.each{|slot,nodes| xputs ">>> covering slot #{slot} with #{nodes[0]}" nodes[0].r.cluster("addslots",slot) } end # handle case "3": keys in multiple nodes. if multi.length > 0 xputs "the folowing uncovered slots have keys in multiple nodes:" xputs multi.keys.join(",") yes_or_die "fix these slots by moving keys into a single node?" multi.each{|slot,nodes| target = get_node_with_most_keys_in_slot(nodes,slot) xputs ">>> covering slot #{slot} moving keys to #{target}" target.r.cluster('addslots',slot) target.r.cluster('setslot',slot,'stable') nodes.each{|src| next if src == target # set the source node in 'importing' state (even if we will # actually migrate keys away) in order to avoid receiving # redirections for migrate. src.r.cluster('setslot',slot,'importing',target.info[:name]) move_slot(src,target,slot,:dots=>true,:fix=>true,:cold=>true) src.r.cluster('setslot',slot,'stable') } } end end # return the owner of the specified slot def get_slot_owners(slot) owners = [] @nodes.each{|n| next if n.has_flag?("slave") n.slots.each{|s,_| owners << n if s == slot } } owners end # return the node, among 'nodes' with the greatest number of keys # in the specified slot. def get_node_with_most_keys_in_slot(nodes,slot) best = nil best_numkeys = 0 @nodes.each{|n| next if n.has_flag?("slave") numkeys = n.r.cluster("countkeysinslot",slot) if numkeys > best_numkeys || best == nil best = n best_numkeys = numkeys end } return best end # slot 'slot' was found to be in importing or migrating state in one or # more nodes. this function fixes this condition by migrating keys where # it seems more sensible. def fix_open_slot(slot) puts ">>> fixing open slot #{slot}" # try to obtain the current slot owner, according to the current # nodes configuration. owners = get_slot_owners(slot) owner = owners[0] if owners.length == 1 migrating = [] importing = [] @nodes.each{|n| next if n.has_flag? "slave" if n.info[:migrating][slot] migrating << n elsif n.info[:importing][slot] importing << n elsif n.r.cluster("countkeysinslot",slot) > 0 && n != owner xputs "*** found keys about slot #{slot} in node #{n}!" importing << n end } puts "set as migrating in: #{migrating.join(",")}" puts "set as importing in: #{importing.join(",")}" # if there is no slot owner, set as owner the slot with the biggest # number of keys, among the set of migrating / importing nodes. if !owner xputs ">>> nobody claims ownership, selecting an owner..." owner = get_node_with_most_keys_in_slot(@nodes,slot) # if we still don't have an owner, we can't fix it. if !owner xputs "[err] can't select a slot owner. impossible to fix." exit 1 end # use addslots to assign the slot. puts "*** configuring #{owner} as the slot owner" owner.r.cluster("setslot",slot,"stable") owner.r.cluster("addslots",slot) # make sure this information will propagate. not strictly needed # since there is no past owner, so all the other nodes will accept # whatever epoch this node will claim the slot with. owner.r.cluster("bumpepoch") # remove the owner from the list of migrating/importing # nodes. migrating.delete(owner) importing.delete(owner) end # if there are multiple owners of the slot, we need to fix it # so that a single node is the owner and all the other nodes # are in importing state. later the fix can be handled by one # of the base cases above. # # note that this case also covers multiple nodes having the slot # in migrating state, since migrating is a valid state only for # slot owners. if owners.length > 1 owner = get_node_with_most_keys_in_slot(owners,slot) owners.each{|n| next if n == owner n.r.cluster('delslots',slot) n.r.cluster('setslot',slot,'importing',owner.info[:name]) importing.delete(n) # avoid duplciates importing << n } owner.r.cluster('bumpepoch') end # case 1: the slot is in migrating state in one slot, and in # importing state in 1 slot. that's trivial to address. if migrating.length == 1 && importing.length == 1 move_slot(migrating[0],importing[0],slot,:dots=>true,:fix=>true) # case 2: there are multiple nodes that claim the slot as importing, # they probably got keys about the slot after a restart so opened # the slot. in this case we just move all the keys to the owner # according to the configuration. elsif migrating.length == 0 && importing.length > 0 xputs ">>> moving all the #{slot} slot keys to its owner #{owner}" importing.each {|node| next if node == owner move_slot(node,owner,slot,:dots=>true,:fix=>true,:cold=>true) xputs ">>> setting #{slot} as stable in #{node}" node.r.cluster("setslot",slot,"stable") } # case 3: there are no slots claiming to be in importing state, but # there is a migrating node that actually don't have any key. we # can just close the slot, probably a reshard interrupted in the middle. elsif importing.length == 0 && migrating.length == 1 && migrating[0].r.cluster("getkeysinslot",slot,10).length == 0 migrating[0].r.cluster("setslot",slot,"stable") else xputs "[err] sorry, redis-trib can't fix this slot yet (work in progress). slot is set as migrating in #{migrating.join(",")}, as importing in #{importing.join(",")}, owner is #{owner}" end end # check if all the nodes agree about the cluster configuration def check_config_consistency if !is_config_consistent? cluster_error "[err] nodes don't agree about configuration!" else xputs "[ok] all nodes agree about slots configuration." end end def is_config_consistent? signatures=[] @nodes.each{|n| signatures << n.get_config_signature } return signatures.uniq.length == 1 end def wait_cluster_join print "waiting for the cluster to join" while !is_config_consistent? print "." stdout.flush sleep 1 end print "\n" end def alloc_slots nodes_count = @nodes.length masters_count = @nodes.length / (@replicas+1) masters = [] # the first step is to split instances by ip. this is useful as # we'll try to allocate master nodes in different physical machines # (as much as possible) and to allocate slaves of a given master in # different physical machines as well. # # this code assumes just that if the ip is different, than it is more # likely that the instance is running in a different physical host # or at least a different virtual machine. ips = {} @nodes.each{|n| ips[n.info[:host]] = [] if !ips[n.info[:host]] ips[n.info[:host]] << n } # select master instances puts "using #{masters_count} masters:" interleaved = [] stop = false while not stop do # take one node from each ip until we run out of nodes # across every ip. ips.each do |ip,nodes| if nodes.empty? # if this ip has no remaining nodes, check for termination if interleaved.length == nodes_count # stop when 'interleaved' has accumulated all nodes stop = true next end else # else, move one node from this ip to 'interleaved' interleaved.push nodes.shift end end end masters = interleaved.slice!(0, masters_count) nodes_count -= masters.length masters.each{|m| puts m} # alloc slots on masters slots_per_node = clusterhashslots.to_f / masters_count first = 0 cursor = 0.0 masters.each_with_index{|n,masternum| last = (cursor+slots_per_node-1).round if last > clusterhashslots || masternum == masters.length-1 last = clusterhashslots-1 end last = first if last < first # min step is 1. n.add_slots first..last first = last+1 cursor += slots_per_node } # select n replicas for every master. # we try to split the replicas among all the ips with spare nodes # trying to avoid the host where the master is running, if possible. # # note we loop two times. the first loop assigns the requested # number of replicas to each master. the second loop assigns any # remaining instances as extra replicas to masters. some masters # may end up with more than their requested number of replicas, but # all nodes will be used. assignment_verbose = false [:requested,:unused].each do |assign| masters.each do |m| assigned_replicas = 0 while assigned_replicas < @replicas break if nodes_count == 0 if assignment_verbose if assign == :requested puts "requesting total of #{@replicas} replicas " \ "(#{assigned_replicas} replicas assigned " \ "so far with #{nodes_count} total remaining)." elsif assign == :unused puts "assigning extra instance to replication " \ "role too (#{nodes_count} remaining)." end end # return the first node not matching our current master node = interleaved.find{|n| n.info[:host] != m.info[:host]} # if we found a node, use it as a best-first match. # otherwise, we didn't find a node on a different ip, so we # go ahead and use a same-ip replica. if node slave = node interleaved.delete node else slave = interleaved.shift end slave.set_as_replica(m.info[:name]) nodes_count -= 1 assigned_replicas += 1 puts "adding replica #{slave} to #{m}" # if we are in the "assign extra nodes" loop, # we want to assign one extra replica to each # master before repeating masters. # this break lets us assign extra replicas to masters # in a round-robin way. break if assign == :unused end end end end def flush_nodes_config @nodes.each{|n| n.flush_node_config } end def show_nodes @nodes.each{|n| xputs n.info_string } end # redis cluster config epoch collision resolution code is able to eventually # set a different epoch to each node after a new cluster is created, but # it is slow compared to assign a progressive config epoch to each node # before joining the cluster. however we do just a best-effort try here # since if we fail is not a problem. def assign_config_epoch config_epoch = 1 @nodes.each{|n| begin n.r.cluster("set-config-epoch",config_epoch) rescue end config_epoch += 1 } end def join_cluster # we use a brute force approach to make sure the node will meet # each other, that is, sending cluster meet messages to all the nodes # about the very same node. # thanks to gossip this information should propagate across all the # cluster in a matter of seconds. first = false @nodes.each{|n| if !first then first = n.info; next; end # skip the first node n.r.cluster("meet",first[:host],first[:port]) } end def yes_or_die(msg) print "#{msg} (type 'yes' to accept): " stdout.flush if !(stdin.gets.chomp.downcase == "yes") xputs "*** aborting..." exit 1 end end def load_cluster_info_from_node(nodeaddr) node = clusternode.new(nodeaddr) node.connect(:abort => true) node.assert_cluster node.load_info(:getfriends => true) add_node(node) node.friends.each{|f| next if f[:flags].index("noaddr") || f[:flags].index("disconnected") || f[:flags].index("fail") fnode = clusternode.new(f[:addr]) fnode.connect() next if !fnode.r begin fnode.load_info() add_node(fnode) rescue => e xputs "[err] unable to load info for node #{fnode}" end } populate_nodes_replicas_info end # this function is called by load_cluster_info_from_node in order to # add additional information to every node as a list of replicas. def populate_nodes_replicas_info # start adding the new field to every node. @nodes.each{|n| n.info[:replicas] = [] } # populate the replicas field using the replicate field of slave # nodes. @nodes.each{|n| if n.info[:replicate] master = get_node_by_name(n.info[:replicate]) if !master xputs "*** warning: #{n} claims to be slave of unknown node id #{n.info[:replicate]}." else master.info[:replicas] << n end end } end # given a list of source nodes return a "resharding plan" # with what slots to move in order to move "numslots" slots to another # instance. def compute_reshard_table(sources,numslots) moved = [] # sort from bigger to smaller instance, for two reasons: # 1) if we take less slots than instances it is better to start # getting from the biggest instances. # 2) we take one slot more from the first instance in the case of not # perfect divisibility. like we have 3 nodes and need to get 10 # slots, we take 4 from the first, and 3 from the rest. so the # biggest is always the first. sources = sources.sort{|a,b| b.slots.length <=> a.slots.length} source_tot_slots = sources.inject(0) {|sum,source| sum+source.slots.length } sources.each_with_index{|s,i| # every node will provide a number of slots proportional to the # slots it has assigned. n = (numslots.to_f/source_tot_slots*s.slots.length) if i == 0 n = n.ceil else n = n.floor end s.slots.keys.sort[(0...n)].each{|slot| if moved.length < numslots moved << {:source => s, :slot => slot} end } } return moved end def show_reshard_table(table) table.each{|e| puts " moving slot #{e[:slot]} from #{e[:source].info[:name]}" } end # move slots between source and target nodes using migrate. # # options: # :verbose -- print a dot for every moved key. # :fix -- we are moving in the context of a fix. use replace. # :cold -- move keys without opening slots / reconfiguring the nodes. # :update -- update nodes.info[:slots] for source/target nodes. # :quiet -- don't print info messages. def move_slot(source,target,slot,o={}) o = {:pipeline => migratedefaultpipeline}.merge(o) # we start marking the slot as importing in the destination node, # 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. if !o[:quiet] print "moving slot #{slot} from #{source} to #{target}: " stdout.flush end if !o[:cold] target.r.cluster("setslot",slot,"importing",source.info[:name]) source.r.cluster("setslot",slot,"migrating",target.info[:name]) end # migrate all the keys from source to target using the migrate command while true keys = source.r.cluster("getkeysinslot",slot,o[:pipeline]) break if keys.length == 0 begin source.r.client.call(["migrate",target.info[:host],target.info[:port],"",0,@timeout,:keys,*keys]) rescue => e if o[:fix] && e.to_s =~ /busykey/ xputs "*** target key exists. replacing it for fix." source.r.client.call(["migrate",target.info[:host],target.info[:port],"",0,@timeout,:replace,:keys,*keys]) else puts "" xputs "[err] calling migrate: #{e}" exit 1 end end print "."*keys.length if o[:dots] stdout.flush end puts if !o[:quiet] # set the new node as the owner of the slot in all the known nodes. if !o[:cold] @nodes.each{|n| next if n.has_flag?("slave") n.r.cluster("setslot",slot,"node",target.info[:name]) } end # update the node logical config if o[:update] then source.info[:slots].delete(slot) target.info[:slots][slot] = true end end # redis-trib subcommands implementations. def check_cluster_cmd(argv,opt) load_cluster_info_from_node(argv[0]) check_cluster end def info_cluster_cmd(argv,opt) load_cluster_info_from_node(argv[0]) show_cluster_info end def rebalance_cluster_cmd(argv,opt) opt = { 'pipeline' => migratedefaultpipeline, 'threshold' => rebalancedefaultthreshold }.merge(opt) # load nodes info before parsing options, otherwise we can't # handle --weight. load_cluster_info_from_node(argv[0]) # options parsing threshold = opt['threshold'].to_i autoweights = opt['auto-weights'] weights = {} opt['weight'].each{|w| fields = w.split("=") node = get_node_by_abbreviated_name(fields[0]) if !node || !node.has_flag?("master") puts "*** no such master node #{fields[0]}" exit 1 end weights[node.info[:name]] = fields[1].to_f } if opt['weight'] useempty = opt['use-empty-masters'] # assign a weight to each node, and compute the total cluster weight. total_weight = 0 nodes_involved = 0 @nodes.each{|n| if n.has_flag?("master") next if !useempty && n.slots.length == 0 n.info[:w] = weights[n.info[:name]] ? weights[n.info[:name]] : 1 total_weight += n.info[:w] nodes_involved += 1 end } # check cluster, only proceed if it looks sane. check_cluster(:quiet => true) if @errors.length != 0 puts "*** please fix your cluster problems before rebalancing" exit 1 end # calculate the slots balance for each node. it's the number of # slots the node should lose (if positive) or gain (if negative) # in order to be balanced. threshold = opt['threshold'].to_f threshold_reached = false @nodes.each{|n| if n.has_flag?("master") next if !n.info[:w] expected = ((clusterhashslots.to_f / total_weight) * n.info[:w]).to_i n.info[:balance] = n.slots.length - expected # compute the percentage of difference between the # expected number of slots and the real one, to see # if it's over the threshold specified by the user. over_threshold = false if threshold > 0 if n.slots.length > 0 err_perc = (100-(100.0*expected/n.slots.length)).abs over_threshold = true if err_perc > threshold elsif expected > 0 over_threshold = true end end threshold_reached = true if over_threshold end } if !threshold_reached xputs "*** no rebalancing needed! all nodes are within the #{threshold}% threshold." return end # only consider nodes we want to change sn = @nodes.select{|n| n.has_flag?("master") && n.info[:w] } # because of rounding, it is possible that the balance of all nodes # summed does not give 0. make sure that nodes that have to provide # slots are always matched by nodes receiving slots. total_balance = sn.map{|x| x.info[:balance]}.reduce{|a,b| a+b} while total_balance > 0 sn.each{|n| if n.info[:balance] < 0 && total_balance > 0 n.info[:balance] -= 1 total_balance -= 1 end } end # sort nodes by their slots balance. sn = sn.sort{|a,b| a.info[:balance] <=> b.info[:balance] } xputs ">>> rebalancing across #{nodes_involved} nodes. total weight = #{total_weight}" if $verbose sn.each{|n| puts "#{n} balance is #{n.info[:balance]} slots" } end # now we have at the start of the 'sn' array nodes that should get # slots, at the end nodes that must give slots. # we take two indexes, one at the start, and one at the end, # incrementing or decrementing the indexes accordingly til we # find nodes that need to get/provide slots. dst_idx = 0 src_idx = sn.length - 1 while dst_idx < src_idx dst = sn[dst_idx] src = sn[src_idx] numslots = [dst.info[:balance],src.info[:balance]].map{|n| n.abs }.min if numslots > 0 puts "moving #{numslots} slots from #{src} to #{dst}" # actaully move the slots. reshard_table = compute_reshard_table([src],numslots) if reshard_table.length != numslots xputs "*** assertio failed: reshard table != number of slots" exit 1 end if opt['simulate'] print "#"*reshard_table.length else reshard_table.each{|e| move_slot(e[:source],dst,e[:slot], :quiet=>true, :dots=>false, :update=>true, :pipeline=>opt['pipeline']) print "#" stdout.flush } end puts end # update nodes balance. dst.info[:balance] += numslots src.info[:balance] -= numslots dst_idx += 1 if dst.info[:balance] == 0 src_idx -= 1 if src.info[:balance] == 0 end end def fix_cluster_cmd(argv,opt) @fix = true @timeout = opt['timeout'].to_i if opt['timeout'] load_cluster_info_from_node(argv[0]) check_cluster end def reshard_cluster_cmd(argv,opt) opt = {'pipeline' => migratedefaultpipeline}.merge(opt) load_cluster_info_from_node(argv[0]) check_cluster if @errors.length != 0 puts "*** please fix your cluster problems before resharding" exit 1 end @timeout = opt['timeout'].to_i if opt['timeout'].to_i # get number of slots if opt['slots'] numslots = opt['slots'].to_i else numslots = 0 while numslots <= 0 or numslots > clusterhashslots print "how many slots do you want to move (from 1 to #{clusterhashslots})? " numslots = stdin.gets.to_i end end # get the target instance if opt['to'] target = get_node_by_name(opt['to']) if !target || target.has_flag?("slave") xputs "*** the specified node is not known or not a master, please retry." exit 1 end else target = nil while not target print "what is the receiving node id? " target = get_node_by_name(stdin.gets.chop) if !target || target.has_flag?("slave") xputs "*** the specified node is not known or not a master, please retry." target = nil end end end # get the source instances sources = [] if opt['from'] opt['from'].split(',').each{|node_id| if node_id == "all" sources = "all" break end src = get_node_by_name(node_id) if !src || src.has_flag?("slave") xputs "*** the specified node is not known or is not a master, please retry." exit 1 end sources << src } else xputs "please enter all the source node ids." xputs " type 'all' to use all the nodes as source nodes for the hash slots." xputs " type 'done' once you entered all the source nodes ids." while true print "source node ##{sources.length+1}:" line = stdin.gets.chop src = get_node_by_name(line) if line == "done" break elsif line == "all" sources = "all" break elsif !src || src.has_flag?("slave") xputs "*** the specified node is not known or is not a master, please retry." elsif src.info[:name] == target.info[:name] xputs "*** it is not possible to use the target node as source node." else sources << src end end end if sources.length == 0 puts "*** no source nodes given, operation aborted" exit 1 end # handle soures == all. if sources == "all" sources = [] @nodes.each{|n| next if n.info[:name] == target.info[:name] next if n.has_flag?("slave") sources << n } end # check if the destination node is the same of any source nodes. if sources.index(target) xputs "*** target node is also listed among the source nodes!" exit 1 end puts "\nready to move #{numslots} slots." puts " source nodes:" sources.each{|s| puts " "+s.info_string} puts " destination node:" puts " #{target.info_string}" reshard_table = compute_reshard_table(sources,numslots) puts " resharding plan:" show_reshard_table(reshard_table) if !opt['yes'] print "do you want to proceed with the proposed reshard plan (yes/no)? " yesno = stdin.gets.chop exit(1) if (yesno != "yes") end reshard_table.each{|e| move_slot(e[:source],target,e[:slot], :dots=>true, :pipeline=>opt['pipeline']) } end # this is an helper function for create_cluster_cmd that verifies if # the number of nodes and the specified replicas have a valid configuration # where there are at least three master nodes and enough replicas per node. def check_create_parameters masters = @nodes.length/(@replicas+1) if masters < 3 puts "*** error: invalid configuration for cluster creation." puts "*** redis cluster requires at least 3 master nodes." puts "*** this is not possible with #{@nodes.length} nodes and #{@replicas} replicas per node." puts "*** at least #{3*(@replicas+1)} nodes are required." exit 1 end end def create_cluster_cmd(argv,opt) opt = {'replicas' => 0}.merge(opt) @replicas = opt['replicas'].to_i xputs ">>> creating cluster" argv[0..-1].each{|n| node = clusternode.new(n) node.connect(:abort => true) node.assert_cluster node.load_info node.assert_empty add_node(node) } check_create_parameters xputs ">>> performing hash slots allocation on #{@nodes.length} nodes..." alloc_slots show_nodes yes_or_die "can i set the above configuration?" flush_nodes_config xputs ">>> nodes configuration updated" xputs ">>> assign a different config epoch to each node" assign_config_epoch xputs ">>> sending cluster meet messages to join the cluster" join_cluster # give one second for the join to start, in order to avoid that # wait_cluster_join will find all the nodes agree about the config as # they are still empty with unassigned slots. sleep 1 wait_cluster_join flush_nodes_config # useful for the replicas check_cluster end def addnode_cluster_cmd(argv,opt) xputs ">>> adding node #{argv[0]} to cluster #{argv[1]}" # check the existing cluster load_cluster_info_from_node(argv[1]) check_cluster # if --master-id was specified, try to resolve it now so that we # abort before starting with the node configuration. if opt['slave'] if opt['master-id'] master = get_node_by_name(opt['master-id']) if !master xputs "[err] no such master id #{opt['master-id']}" end else master = get_master_with_least_replicas xputs "automatically selected master #{master}" end end # add the new node new = clusternode.new(argv[0]) new.connect(:abort => true) new.assert_cluster new.load_info new.assert_empty first = @nodes.first.info add_node(new) # send cluster meet command to the new node xputs ">>> send cluster meet to node #{new} to make it join the cluster." new.r.cluster("meet",first[:host],first[:port]) # additional configuration is needed if the node is added as # a slave. if opt['slave'] wait_cluster_join xputs ">>> configure node as replica of #{master}." new.r.cluster("replicate",master.info[:name]) end xputs "[ok] new node added correctly." end def delnode_cluster_cmd(argv,opt) id = argv[1].downcase xputs ">>> removing node #{id} from cluster #{argv[0]}" # load cluster information load_cluster_info_from_node(argv[0]) # check if the node exists and is not empty node = get_node_by_name(id) if !node xputs "[err] no such node id #{id}" exit 1 end if node.slots.length != 0 xputs "[err] node #{node} is not empty! reshard data away and try again." exit 1 end # send cluster forget to all the nodes but the node to remove xputs ">>> sending cluster forget messages to the cluster..." @nodes.each{|n| next if n == node if n.info[:replicate] && n.info[:replicate].downcase == id # reconfigure the slave to replicate with some other node master = get_master_with_least_replicas xputs ">>> #{n} as replica of #{master}" n.r.cluster("replicate",master.info[:name]) end n.r.cluster("forget",argv[1]) } # finally shutdown the node xputs ">>> shutdown the node." node.r.shutdown end def set_timeout_cluster_cmd(argv,opt) timeout = argv[1].to_i if timeout < 100 puts "setting a node timeout of less than 100 milliseconds is a bad idea." exit 1 end # load cluster information load_cluster_info_from_node(argv[0]) ok_count = 0 err_count = 0 # send cluster forget to all the nodes but the node to remove xputs ">>> reconfiguring node timeout in every cluster node..." @nodes.each{|n| begin n.r.config("set","cluster-node-timeout",timeout) n.r.config("rewrite") ok_count += 1 xputs "*** new timeout set for #{n}" rescue => e puts "err setting node-timeot for #{n}: #{e}" err_count += 1 end } xputs ">>> new node timeout set. #{ok_count} ok, #{err_count} err." end def call_cluster_cmd(argv,opt) cmd = argv[1..-1] cmd[0] = cmd[0].upcase # load cluster information load_cluster_info_from_node(argv[0]) xputs ">>> calling #{cmd.join(" ")}" @nodes.each{|n| begin res = n.r.send(*cmd) puts "#{n}: #{res}" rescue => e puts "#{n}: #{e}" end } end def import_cluster_cmd(argv,opt) source_addr = opt['from'] xputs ">>> importing data from #{source_addr} to cluster #{argv[1]}" use_copy = opt['copy'] use_replace = opt['replace'] # check the existing cluster. load_cluster_info_from_node(argv[0]) check_cluster # connect to the source node. xputs ">>> connecting to the source redis instance" src_host,src_port = source_addr.split(":") source = redis.new(:host =>src_host, :port =>src_port) if source.info['cluster_enabled'].to_i == 1 xputs "[err] the source node should not be a cluster node." end xputs "*** importing #{source.dbsize} keys from db 0" # build a slot -> node map slots = {} @nodes.each{|n| n.slots.each{|s,_| slots[s] = n } } # use scan to iterate over the keys, migrating to the # right node as needed. cursor = nil while cursor != 0 cursor,keys = source.scan(cursor, :count => 1000) cursor = cursor.to_i keys.each{|k| # migrate keys using the migrate command. slot = key_to_slot(k) target = slots[slot] print "migrating #{k} to #{target}: " stdout.flush begin cmd = ["migrate",target.info[:host],target.info[:port],k,0,@timeout] cmd << :copy if use_copy cmd << :replace if use_replace source.client.call(cmd) rescue => e puts e else puts "ok" end } end end def help_cluster_cmd(argv,opt) show_help exit 0 end # parse the options for the specific command "cmd". # returns an hash populate with option => value pairs, and the index of # the first non-option argument in argv. def parse_options(cmd) idx = 1 ; # current index into argv options={} while idx < argv.length && argv[idx][0..1] == '--' if argv[idx][0..1] == "--" option = argv[idx][2..-1] idx += 1 # --verbose is a global option if option == "verbose" $verbose = true next end if allowed_options[cmd] == nil || allowed_options[cmd][option] == nil puts "unknown option '#{option}' for command '#{cmd}'" exit 1 end if allowed_options[cmd][option] != false value = argv[idx] idx += 1 else value = true end # if the option is set to [], it's a multiple arguments # option. we just queue every new value into an array. if allowed_options[cmd][option] == [] options[option] = [] if !options[option] options[option] << value else options[option] = value end else # remaining arguments are not options. break end end # enforce mandatory options if allowed_options[cmd] allowed_options[cmd].each {|option,val| if !options[option] && val == :required puts "option '--#{option}' is required "+ \ "for subcommand '#{cmd}'" exit 1 end } end return options,idx endend ################################################################################## libraries## we try to don't depend on external libs since this is a critical part# of redis cluster.################################################################################# # this is the crc16 algorithm used by redis cluster to hash keys.# implementation according to ccitt standards.## this is actually the xmodem crc 16 algorithm, using the# following parameters:## name : "xmodem", also known as "zmodem", "crc-16/acorn"# width : 16 bit# poly : 1021 (that is actually x^16 + x^12 + x^5 + 1)# initialization : 0000# reflect input byte : false# reflect output crc : false# xor constant to output crc : 0000# output for "123456789" : 31c3 module redisclustercrc16 def redisclustercrc16.crc16(bytes) crc = 0 bytes.each_byte{|b| crc = ((crc<<8) & 0xffff) ^ xmodemcrc16lookup[((crc>>8)^b) & 0xff] } crc end private xmodemcrc16lookup = [ 0x0000,0x1021,0x2042,0x3063,0x4084,0x50a5,0x60c6,0x70e7, 0x8108,0x9129,0xa14a,0xb16b,0xc18c,0xd1ad,0xe1ce,0xf1ef, 0x1231,0x0210,0x3273,0x2252,0x52b5,0x4294,0x72f7,0x62d6, 0x9339,0x8318,0xb37b,0xa35a,0xd3bd,0xc39c,0xf3ff,0xe3de, 0x2462,0x3443,0x0420,0x1401,0x64e6,0x74c7,0x44a4,0x5485, 0xa56a,0xb54b,0x8528,0x9509,0xe5ee,0xf5cf,0xc5ac,0xd58d, 0x3653,0x2672,0x1611,0x0630,0x76d7,0x66f6,0x5695,0x46b4, 0xb75b,0xa77a,0x9719,0x8738,0xf7df,0xe7fe,0xd79d,0xc7bc, 0x48c4,0x58e5,0x6886,0x78a7,0x0840,0x1861,0x2802,0x3823, 0xc9cc,0xd9ed,0xe98e,0xf9af,0x8948,0x9969,0xa90a,0xb92b, 0x5af5,0x4ad4,0x7ab7,0x6a96,0x1a71,0x0a50,0x3a33,0x2a12, 0xdbfd,0xcbdc,0xfbbf,0xeb9e,0x9b79,0x8b58,0xbb3b,0xab1a, 0x6ca6,0x7c87,0x4ce4,0x5cc5,0x2c22,0x3c03,0x0c60,0x1c41, 0xedae,0xfd8f,0xcdec,0xddcd,0xad2a,0xbd0b,0x8d68,0x9d49, 0x7e97,0x6eb6,0x5ed5,0x4ef4,0x3e13,0x2e32,0x1e51,0x0e70, 0xff9f,0xefbe,0xdfdd,0xcffc,0xbf1b,0xaf3a,0x9f59,0x8f78, 0x9188,0x81a9,0xb1ca,0xa1eb,0xd10c,0xc12d,0xf14e,0xe16f, 0x1080,0x00a1,0x30c2,0x20e3,0x5004,0x4025,0x7046,0x6067, 0x83b9,0x9398,0xa3fb,0xb3da,0xc33d,0xd31c,0xe37f,0xf35e, 0x02b1,0x1290,0x22f3,0x32d2,0x4235,0x5214,0x6277,0x7256, 0xb5ea,0xa5cb,0x95a8,0x8589,0xf56e,0xe54f,0xd52c,0xc50d, 0x34e2,0x24c3,0x14a0,0x0481,0x7466,0x6447,0x5424,0x4405, 0xa7db,0xb7fa,0x8799,0x97b8,0xe75f,0xf77e,0xc71d,0xd73c, 0x26d3,0x36f2,0x0691,0x16b0,0x6657,0x7676,0x4615,0x5634, 0xd94c,0xc96d,0xf90e,0xe92f,0x99c8,0x89e9,0xb98a,0xa9ab, 0x5844,0x4865,0x7806,0x6827,0x18c0,0x08e1,0x3882,0x28a3, 0xcb7d,0xdb5c,0xeb3f,0xfb1e,0x8bf9,0x9bd8,0xabbb,0xbb9a, 0x4a75,0x5a54,0x6a37,0x7a16,0x0af1,0x1ad0,0x2ab3,0x3a92, 0xfd2e,0xed0f,0xdd6c,0xcd4d,0xbdaa,0xad8b,0x9de8,0x8dc9, 0x7c26,0x6c07,0x5c64,0x4c45,0x3ca2,0x2c83,0x1ce0,0x0cc1, 0xef1f,0xff3e,0xcf5d,0xdf7c,0xaf9b,0xbfba,0x8fd9,0x9ff8, 0x6e17,0x7e36,0x4e55,0x5e74,0x2e93,0x3eb2,0x0ed1,0x1ef0 ]end # turn a key name into the corrisponding redis cluster slot.def key_to_slot(key) # only hash what is inside {...} if there is such a pattern in the key. # note that the specification requires the content that is between # the first { and the first } after the first {. if we found {} without # nothing in the middle, the whole key is hashed as usually. s = key.index "{" if s e = key.index "}",s+1 if e && e != s+1 key = key[s+1..e-1] end end redisclustercrc16.crc16(key) % 16384end ################################################################################## definition of commands################################################################################# commands={ "create" => ["create_cluster_cmd", -2, "host1:port1 ... hostn:portn"], "check" => ["check_cluster_cmd", 2, "host:port"], "info" => ["info_cluster_cmd", 2, "host:port"], "fix" => ["fix_cluster_cmd", 2, "host:port"], "reshard" => ["reshard_cluster_cmd", 2, "host:port"], "rebalance" => ["rebalance_cluster_cmd", -2, "host:port"], "add-node" => ["addnode_cluster_cmd", 3, "new_host:new_port existing_host:existing_port"], "del-node" => ["delnode_cluster_cmd", 3, "host:port node_id"], "set-timeout" => ["set_timeout_cluster_cmd", 3, "host:port milliseconds"], "call" => ["call_cluster_cmd", -3, "host:port command arg arg .. arg"], "import" => ["import_cluster_cmd", 2, "host:port"], "help" => ["help_cluster_cmd", 1, "(show this help)"]} allowed_options={ "create" => {"replicas" => true}, "add-node" => {"slave" => false, "master-id" => true}, "import" => {"from" => :required, "copy" => false, "replace" => false}, "reshard" => {"from" => true, "to" => true, "slots" => true, "yes" => false, "timeout" => true, "pipeline" => true}, "rebalance" => {"weight" => [], "auto-weights" => false, "use-empty-masters" => false, "timeout" => true, "simulate" => false, "pipeline" => true, "threshold" => true}, "fix" => {"timeout" => migratedefaulttimeout},} def show_help puts "usage: redis-trib <command> <options> <arguments ...>\n\n" commands.each{|k,v| o = "" puts " #{k.ljust(15)} #{v[2]}" if allowed_options[k] allowed_options[k].each{|optname,has_arg| puts " --#{optname}" + (has_arg ? " <arg>" : "") } end } puts "\nfor check, fix, reshard, del-node, set-timeout you can specify the host and port of any working node in the cluster.\n"end # sanity checkif argv.length == 0 show_help exit 1end rt = redistrib.newcmd_spec = commands[argv[0].downcase]if !cmd_spec puts "unknown redis-trib subcommand '#{argv[0]}'" exit 1end # parse optionscmd_options,first_non_option = rt.parse_options(argv[0].downcase)rt.check_arity(cmd_spec[1],argv.length-(first_non_option-1)) # dispatchrt.send(cmd_spec[0],argv[first_non_option..-1],cmd_options) |
总结
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原文链接：https://blog.csdn.net/zys15256630193/article/details/109091746
