The redis-migrator from yankov

Redis 2.6 supports MIGRATE

Probably too early as long as 2.6 is in RC. So this is a place holder issue.
Redis 2.6 supports the MIGRATE command that allows to atomically migrate a key between two servers without the need to know the type of the key.
from the docs:

Atomically transfer a key from a source Redis instance to a destination Redis instance. On success the key is deleted from the original instance and is guaranteed to exist in the target instance.

Usage :

MIGRATE host port key destination-db timeout

keys * can't work with huge of DB

I had tried use redis-migrator to split a large DB, there have more than 20,000,000 keys in Redis.

In this line, I saw that use keys(*) to get all of the keys from Redis, that can't work, because it will timeout.

ERR wrong number of arguments for 'migrate' command

require 'redis_migrator'

old_redis_hosts = ["redis://127.0.0.1:6379"]
new_redis_hosts = ["redis://127.0.0.1:6380", "redis://127.0.0.1:6381", "redis://127.0.0.1:6382", "redis://127.0.0.1:6383", "redis://127.0.0.1:6384"]

migrator = Redis::Migrator.new(old_redis_hosts, new_redis_hosts)
migrator.run

Redis 2.8.8
Ruby 2.0.0
redis-rb 3.0.4

/usr/local/lib/ruby/gems/2.0.0/gems/redis-3.0.4/lib/redis/pipeline.rb:126:in `value': ERR wrong number of arguments for 'migrate' command (Redis::CommandError)
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis-3.0.4/lib/redis/pipeline.rb:118:in `_set'
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis-3.0.4/lib/redis/pipeline.rb:64:in `block in finish'
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis-3.0.4/lib/redis/pipeline.rb:63:in `each'
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis-3.0.4/lib/redis/pipeline.rb:63:in `each_with_index'
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis-3.0.4/lib/redis/pipeline.rb:63:in `each'
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis-3.0.4/lib/redis/pipeline.rb:63:in `map'
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis-3.0.4/lib/redis/pipeline.rb:63:in `finish'
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis-3.0.4/lib/redis/client.rb:121:in `block in call_pipeline'
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis-3.0.4/lib/redis/client.rb:243:in `with_reconnect'
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis-3.0.4/lib/redis/client.rb:119:in `call_pipeline'
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis-3.0.4/lib/redis.rb:2031:in `block in pipelined'
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis-3.0.4/lib/redis.rb:36:in `block in synchronize'
    from /usr/local/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis-3.0.4/lib/redis.rb:36:in `synchronize'
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis-3.0.4/lib/redis.rb:2027:in `pipelined'
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis_migrator-0.1.1/lib/redis_migrator/redis_native_migrator.rb:21:in `block in migrate'
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis_migrator-0.1.1/lib/redis_migrator/redis_native_migrator.rb:20:in `each'
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis_migrator-0.1.1/lib/redis_migrator/redis_native_migrator.rb:20:in `migrate'
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis_migrator-0.1.1/lib/redis_migrator.rb:53:in `migrate_keys'
    from /usr/local/lib/ruby/gems/2.0.0/gems/redis_migrator-0.1.1/lib/redis_migrator.rb:68:in `block (2 levels) in run'

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redis-migrator's Issues

Redis 2.6 supports MIGRATE

keys * can't work with huge of DB

ERR wrong number of arguments for 'migrate' command

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