Module: Fairy::RomaInterface

Defined in:
lib/fairy/client/roma.rb

Constant Summary collapse

DUMP_KEY_PREFIX = 
'__dump_by_fairy__'
DEFAULT_HASH_NAME = 
'roma'
DEFAULT_FORMAT = 
[5, 7]

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#dump_id ⇒ Object (readonly)

Returns the value of attribute dump_id.



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# File 'lib/fairy/client/roma.rb', line 10

def dump_id
  @dump_id
end

#dump_key ⇒ Object (readonly)

Returns the value of attribute dump_key.



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# File 'lib/fairy/client/roma.rb', line 10

def dump_key
  @dump_key
end

Instance Method Details

#roma(addr_port, opts = {}) ⇒ Object

input data from ROMA

ex)

require 'fairy'

fairy = Fairy::Fairy.new
f0 = fairy.roma(
  'fairy-xm01_11211',
  :format=>[5,7,1],
  :select=>%{|k,v,t| v.to_i >= 500 && v.to_i < 600},
  :map=>%{|k,v,t| [k.sub(/^key-/, ''), v, v.to_i, Time.at(t).strftime('%Y-%m-%d %H:%M:%S')]},
  :nice=>20
)
f1 = f0.map(%{|*ary| ary.join(",")})
f1.output('./roma_test.out')

available options are:

:hash     name of destination hash. '*' means all hashes (defalut='roma')
:format   fields of CSV. specify by Array (default=[5, 7])
          available fields:
            0: virtual node ID
            1: last modified time (UNIX timestamp)
            2: logical clock
            3: expire time
            4: key length
            5: key
            6: value length
            7: value
:select   block source to select particular records
:map      block source to apply to each records
:nice     priority of process (LOW 20 <--> -20 HIGH)



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# File 'lib/fairy/client/roma.rb', line 45

def roma(addr_port, opts={})
  addr_port = [addr_port] if addr_port.kind_of?(String)

  require 'roma/client/export/rdump'

  @@roma_dump_serial_no ||= 0
  @@roma_dump_serial_no += 1
  @dump_id = "#{`hostname`.chomp}_#{Time.now.strftime("%y%m%d%H%M%S")}_#{$$}_#{@@roma_dump_serial_no}"
  @dump_key = DUMP_KEY_PREFIX+dump_id
  dumpinfo = Roma::Client::Export::RomaDump.dump(dump_key, dump_id, addr_port)

  ##############################################
  # structure of dumpinfo
  # {
  #   "hostname1_port1" => "STARTED path"
  #   "hostname1_port2" => "STARTED path"
  #   "hostname2_port1" => "STARTED path"
  #   ...
  # }
  ##############################################

  uris = []
  dumpinfo.each{|host_port, stat_path|
    m = host_port.match(/\A(.*)_\d+\z/)
    host = m[1]
    m2 = stat_path.match(/\A\S+\s+(.*)\z/)
    path = m2[1]
    uris << 'file://'+host+path
  }

  f0 = exec(uris)

  if opts[:hash]
    self.def_pool_variable(:dest_hash, opts[:hash])
  else
    self.def_pool_variable(:dest_hash, DEFAULT_HASH_NAME)
  end

  if opts[:nice]
    self.def_pool_variable(:nice, opts[:nice])
  else
    self.def_pool_variable(:nice, 0)
  end

  f1 = f0.mapf(%q{|uri|
    dumpfiles = Dir.glob(URI(uri).path+"/#{@dest_hash}/*.dump")
    dumpfiles
  }, :BEGIN => %q{
    require 'uri'
    @dest_hash = @Pool.dest_hash
    system("renice #{@Pool.nice} #{$$}") unless @Pool.nice.zero?
  })

  if opts[:format]
    self.def_pool_variable(:format, opts[:format])
  else
    self.def_pool_variable(:format, DEFAULT_FORMAT)
  end

  if opts[:select]
    src = add_proc_src(opts[:select])
    eval(src)  # syntax check
    self.def_pool_variable(:select, src)
  else
    self.def_pool_variable(:select, '')
  end

  if opts[:map]
    src = add_proc_src(opts[:map])
    eval(src)  # syntax check
    self.def_pool_variable(:map, src)
  else
    self.def_pool_variable(:map, '')
  end

  f2 = f1.mapf(%q{|dumpf|
    records = []
    File.open(dumpf, 'rb'){|io|
      Roma::Client::Export::RomaDump.load(io) {|*rec|
        rec_formatted = @format.inject([]){|res, idx| res << rec[idx]}
        next if @select && [email protected](*rec_formatted)
        if @map
          records << @map.call(rec_formatted)
        else
          records << rec_formatted
        end
      }
    }
    records
  }, :N => 1, :BEGIN => %q{
    require 'roma/client/export/rdump'
    @format = @Pool.format.dc_deep_copy
    @select = eval(@Pool.select) unless @Pool.select.empty?
    @map = eval(@Pool.map) unless @Pool.map.empty?
  })

  f2  
end