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%% -------------------------------------------------------------------
%% riak_handoff_sender: send a partition's data via TCP-based handoff
%% Copyright (c) 2007-2010 Basho Technologies, Inc. All Rights Reserved.
%% This file is provided to you under the Apache License,
%% Version 2.0 (the "License"); you may not use this file
%% except in compliance with the License. You may obtain
%% a copy of the License at
%% Unless required by applicable law or agreed to in writing,
%% software distributed under the License is distributed on an
%% KIND, either express or implied. See the License for the
%% specific language governing permissions and limitations
%% under the License.
%% -------------------------------------------------------------------
%% @doc send a partition's data via TCP-based handoff
-define(ACK_COUNT, 1000).
start_link(TargetNode, Module, Partition) ->
Self = self(),
Pid = spawn_link(fun()->start_fold(TargetNode, Module,Partition, Self) end),
{ok, Pid}.
start_fold(TargetNode, Module, Partition, ParentPid) ->
error_logger:info_msg("Starting handoff of partition ~p ~p to ~p~n",
[Module, Partition, TargetNode]),
[_Name,Host] = string:tokens(atom_to_list(TargetNode), "@"),
{ok, Port} = get_handoff_port(TargetNode),
{ok, Socket} = gen_tcp:connect(Host, Port,
{packet, 4},
{active, false}], 15000),
%% Piggyback the sync command from previous releases to send
%% the vnode type across. If talking to older nodes they'll
%% just do a sync, newer nodes will decode the module name.
%% After 0.12.0 the calls can be switched to use PT_MSG_SYNC
VMaster = list_to_atom(atom_to_list(Module) ++ "_master"),
ModBin = atom_to_binary(Module, utf8),
Msg = <<?PT_MSG_OLDSYNC:8,ModBin/binary>>,
ok = gen_tcp:send(Socket, Msg),
{ok,[?PT_MSG_OLDSYNC|<<"sync">>]} = gen_tcp:recv(Socket, 0),
M = <<?PT_MSG_INIT:8,Partition:160/integer>>,
ok = gen_tcp:send(Socket, M),
StartFoldTime = now(),
{Socket,ParentPid,Module,_Ack,SentCount} =
riak_core_vnode_master:sync_command({Partition, node()},
foldfun=fun visit_item/3,
VMaster, infinity),
EndFoldTime = now(),
error_logger:info_msg("Handoff of partition ~p ~p to ~p completed: sent ~p objects in ~.2f seconds",
[Module, Partition, TargetNode, SentCount,
timer:now_diff(EndFoldTime, StartFoldTime) / 1000000]),
gen_fsm:send_event(ParentPid, handoff_complete)
%% Socket will be closed when this process exits
Err:Reason ->
error_logger:error_msg("Handoff sender ~p ~p failed ~p:~p\n",
[Module, Partition, Err,Reason])
visit_item(K, V, {Socket, ParentPid, Module, ?ACK_COUNT, Total}) ->
M = <<?PT_MSG_OLDSYNC:8,"sync">>,
ok = gen_tcp:send(Socket, M),
{ok,[?PT_MSG_OLDSYNC|<<"sync">>]} = gen_tcp:recv(Socket, 0),
visit_item(K, V, {Socket, ParentPid, Module, 0, Total});
visit_item(K, V, {Socket, ParentPid, Module, Ack, Total}) ->
BinObj = Module:encode_handoff_item(K, V),
M = <<?PT_MSG_OBJ:8,BinObj/binary>>,
ok = gen_tcp:send(Socket, M),
{Socket, ParentPid, Module, Ack+1, Total+1}.
get_handoff_port(Node) when is_atom(Node) ->
case catch(gen_server2:call({riak_core_handoff_listener, Node}, handoff_port, infinity)) of
{'EXIT', _} ->
%% Check old location from previous release
gen_server2:call({riak_kv_handoff_listener, Node}, handoff_port, infinity);
Other -> Other
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