Cluster: initial ability to import data from standalone instance.

This commit is contained in:
antirez 2014-05-10 17:59:31 +02:00
parent 71d0e7e0ea
commit 2a48bd4a37

View File

@ -988,6 +988,47 @@ class RedisTrib
}
end
def import_cluster_cmd(argv,opt)
source_addr = opt['from']
xputs ">>> Importing data from #{source_addr} to cluster #{argv[1]}"
# 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]
puts "Migrating #{k} to #{target}"
source.client.call(["migrate",target.info[:host],target.info[:port],k,0,1000])
}
end
end
def help_cluster_cmd(argv,opt)
show_help
exit 0
@ -1021,16 +1062,107 @@ class RedisTrib
end
# Enforce mandatory options
ALLOWED_OPTIONS[cmd].each {|option,val|
if !options[option] && val == :required
puts "Option '--#{option}' is required for subcommand '#{cmd}'"
exit 1
end
}
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
end
end
#################################################################################
# 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) % 16384
end
#################################################################################
# Definition of commands
#################################################################################
COMMANDS={
"create" => ["create_cluster_cmd", -2, "host1:port1 ... hostN:portN"],
"check" => ["check_cluster_cmd", 2, "host:port"],
@ -1040,12 +1172,14 @@ COMMANDS={
"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}
"add-node" => {"slave" => false, "master-id" => true},
"import" => {"from" => :required}
}
def show_help