Merge branch 'unstable' of github.com:antirez/redis into unstable

TODO

@@ -36,6 +36,8 @@ OPTIMIZATIONS
 * SORT: Don't copy the list into a vector when BY argument is constant.
 * Write the hash table size of every db in the dump, so that Redis can resize the hash table just one time when loading a big DB.
 * Read-only mode for slaves.
+* Redis big lists as linked lists of small ziplists?
+  Possibly a simple heuristic that join near nodes when some node gets smaller than the low_level, and split it into two if gets bigger than high_level.
 
 REPORTING
 =========

src/cluster.c

@@ -1193,11 +1193,13 @@ void clusterCommand(redisClient *c) {
             "cluster_slots_ok:%d\r\n"
             "cluster_slots_pfail:%d\r\n"
             "cluster_slots_fail:%d\r\n"
+            "cluster_known_nodes:%lu\r\n"
             , statestr[server.cluster.state],
             slots_assigned,
             slots_ok,
             slots_pfail,
-            slots_fail
+            slots_fail,
+            dictSize(server.cluster.nodes)
         );
         addReplySds(c,sdscatprintf(sdsempty(),"$%lu\r\n",
             (unsigned long)sdslen(info)));

src/redis-trib.rb

@@ -0,0 +1,98 @@
+#!/usr/bin/env ruby
+
+require 'rubygems'
+require 'redis'
+
+def xputs(s)
+    printf s
+    STDOUT.flush
+end
+
+class ClusterNode
+    def initialize(addr)
+        s = addr.split(":")
+        if s.length != 2
+            puts "Invalid node name #{node}"
+            exit 1
+        end
+        @host = s[0]
+        @port = s[1]
+    end
+
+    def to_s
+        "#{@host}:#{@port}"
+    end
+
+    def connect
+        xputs "Connecting to node #{self}: "
+        begin
+            @r = Redis.new(:host => @ost, :port => @port)
+            @r.ping
+        rescue
+            puts "ERROR"
+            puts "Sorry, can't connect to node #{self}"
+        end
+        puts "OK"
+    end
+
+    def assert_cluster
+        info = @r.info
+        if !info["cluster_enabled"] || info["cluster_enabled"].to_i == 0
+            puts "Error: 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'])
+            puts "Error: Node #{self} is not empty. Either the node already knows other nodes (check with nodes-info) or contains some key in database 0."
+            exit 1
+        end
+    end
+
+    def r
+        @r
+    end
+end
+
+class RedisTrib
+    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))
+           puts "Wrong number of arguments for specified sub command"
+           exit 1
+        end
+    end
+
+    def create_cluster
+        puts "Creating cluster"
+        ARGV[1..-1].each{|n|
+            node = ClusterNode.new(n)
+            node.connect
+            node.assert_cluster
+            node.assert_empty
+        }
+    end
+end
+
+COMMANDS={
+    "create-cluster" => ["create_cluster", -2]
+}
+
+# Sanity check
+if ARGV.length == 0
+    puts "Usage: redis-trib <command> <arguments ...>"
+    exit 1
+end
+
+rt = RedisTrib.new
+cmd_spec = COMMANDS[ARGV[0].downcase]
+if !cmd_spec
+    puts "Unknown redis-trib subcommand '#{ARGV[0]}'"
+    exit 1
+end
+rt.check_arity(cmd_spec[1],ARGV.length)
+
+# Dispatch
+rt.send(cmd_spec[0])

src/redis.c

@@ -1498,6 +1498,15 @@ sds genRedisInfoString(char *section) {
         }
     }
 
+    /* Clusetr */
+    if (allsections || defsections || !strcasecmp(section,"cluster")) {
+        if (sections++) info = sdscat(info,"\r\n");
+        info = sdscatprintf(info,
+        "# Cluster\r\n"
+        "cluster_enabled:%d\r\n",
+        server.cluster_enabled);
+    }
+
     /* Key space */
     if (allsections || defsections || !strcasecmp(section,"keyspace")) {
         if (sections++) info = sdscat(info,"\r\n");