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riak_kv_vnode.erl
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riak_kv_vnode.erl
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%% -------------------------------------------------------------------
%%
%% riak_kv_vnode: VNode Implementation
%%
%% 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
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing,
%% software distributed under the License is distributed on an
%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
%% KIND, either express or implied. See the License for the
%% specific language governing permissions and limitations
%% under the License.
%%
%% -------------------------------------------------------------------
-module(riak_kv_vnode).
-author('Kevin Smith <kevin@basho.com>').
-author('John Muellerleile <johnm@basho.com>').
-behaviour(riak_core_vnode).
%% API
-export([test_vnode/1, put/7]).
-export([start_vnode/1,
start_vnodes/1,
get/3,
del/3,
put/6,
local_get/2,
local_put/2,
local_put/3,
coord_put/6,
readrepair/6,
list_keys/4,
fold/3,
get_vclocks/2,
vnode_status/1,
ack_keys/1,
repair/1,
repair_status/1,
repair_filter/1,
hashtree_pid/1,
rehash/3,
request_hashtree_pid/1,
reformat_object/2]).
%% riak_core_vnode API
-export([init/1,
terminate/2,
handle_command/3,
handle_coverage/4,
is_empty/1,
delete/1,
handle_handoff_command/3,
handoff_starting/2,
handoff_cancelled/1,
handoff_finished/2,
handle_handoff_data/2,
encode_handoff_item/2,
handle_exit/3,
handle_info/2]).
-include_lib("riak_kv_vnode.hrl").
-include_lib("riak_kv_map_phase.hrl").
-include_lib("riak_core/include/riak_core_pb.hrl").
-ifdef(TEST).
-include_lib("eunit/include/eunit.hrl").
-export([put_merge/6]). %% For fsm_eqc_vnode
-endif.
-record(mrjob, {cachekey :: term(),
bkey :: term(),
reqid :: term(),
target :: pid()}).
-record(state, {idx :: partition(),
mod :: module(),
modstate :: term(),
mrjobs :: term(),
vnodeid :: undefined | binary(),
delete_mode :: keep | immediate | pos_integer(),
bucket_buf_size :: pos_integer(),
index_buf_size :: pos_integer(),
key_buf_size :: pos_integer(),
async_folding :: boolean(),
in_handoff = false :: boolean(),
hashtrees :: pid() }).
-type index_op() :: add | remove.
-type index_value() :: integer() | binary().
-type index() :: non_neg_integer().
-type state() :: #state{}.
-define(DEFAULT_HASHTREE_TOKENS, 90).
-record(putargs, {returnbody :: boolean(),
coord:: boolean(),
lww :: boolean(),
bkey :: {binary(), binary()},
robj :: term(),
index_specs=[] :: [{index_op(), binary(), index_value()}],
reqid :: non_neg_integer(),
bprops :: maybe_improper_list(),
starttime :: non_neg_integer(),
prunetime :: undefined| non_neg_integer(),
is_index=false :: boolean() %% set if the b/end supports indexes
}).
-spec maybe_create_hashtrees(state()) -> state().
maybe_create_hashtrees(State) ->
maybe_create_hashtrees(riak_kv_entropy_manager:enabled(), State).
-spec maybe_create_hashtrees(boolean(), state()) -> state().
maybe_create_hashtrees(false, State) ->
State;
maybe_create_hashtrees(true, State=#state{idx=Index}) ->
%% Only maintain a hashtree if a primary vnode
{ok, Ring} = riak_core_ring_manager:get_my_ring(),
case riak_core_ring:index_owner(Ring, Index) == node() of
false ->
State;
true ->
RP = riak_kv_util:responsible_preflists(Index),
case riak_kv_index_hashtree:start(Index, RP, self()) of
{ok, Trees} ->
monitor(process, Trees),
State#state{hashtrees=Trees};
Error ->
lager:info("riak_kv/~p: unable to start index_hashtree: ~p",
[Index, Error]),
erlang:send_after(1000, self(), retry_create_hashtree),
State#state{hashtrees=undefined}
end
end.
%% API
start_vnode(I) ->
riak_core_vnode_master:get_vnode_pid(I, riak_kv_vnode).
start_vnodes(IdxList) ->
riak_core_vnode_master:get_vnode_pid(IdxList, riak_kv_vnode).
test_vnode(I) ->
riak_core_vnode:start_link(riak_kv_vnode, I, infinity).
get(Preflist, BKey, ReqId) ->
%% Assuming this function is called from a FSM process
%% so self() == FSM pid
get(Preflist, BKey, ReqId, {fsm, undefined, self()}).
get(Preflist, BKey, ReqId, Sender) ->
Req = ?KV_GET_REQ{bkey=BKey,
req_id=ReqId},
riak_core_vnode_master:command(Preflist,
Req,
Sender,
riak_kv_vnode_master).
del(Preflist, BKey, ReqId) ->
riak_core_vnode_master:command(Preflist,
?KV_DELETE_REQ{bkey=BKey,
req_id=ReqId},
riak_kv_vnode_master).
%% Issue a put for the object to the preflist, expecting a reply
%% to an FSM.
put(Preflist, BKey, Obj, ReqId, StartTime, Options) when is_integer(StartTime) ->
put(Preflist, BKey, Obj, ReqId, StartTime, Options, {fsm, undefined, self()}).
put(Preflist, BKey, Obj, ReqId, StartTime, Options, Sender)
when is_integer(StartTime) ->
riak_core_vnode_master:command(Preflist,
?KV_PUT_REQ{
bkey = BKey,
object = Obj,
req_id = ReqId,
start_time = StartTime,
options = Options},
Sender,
riak_kv_vnode_master).
local_put(Index, Obj) ->
local_put(Index, Obj, []).
local_put(Index, Obj, Options) ->
BKey = {riak_object:bucket(Obj), riak_object:key(Obj)},
Ref = make_ref(),
ReqId = erlang:phash2(erlang:now()),
StartTime = riak_core_util:moment(),
Sender = {raw, Ref, self()},
put({Index, node()}, BKey, Obj, ReqId, StartTime, Options, Sender),
receive
{Ref, Reply} ->
Reply
end.
local_get(Index, BKey) ->
Ref = make_ref(),
ReqId = erlang:phash2(erlang:now()),
Sender = {raw, Ref, self()},
get({Index,node()}, BKey, ReqId, Sender),
receive
{Ref, {r, Result, Index, ReqId}} ->
Result;
{Ref, Reply} ->
{error, Reply}
end.
%% Issue a put for the object to the preflist, expecting a reply
%% to an FSM.
coord_put(IndexNode, BKey, Obj, ReqId, StartTime, Options) when is_integer(StartTime) ->
coord_put(IndexNode, BKey, Obj, ReqId, StartTime, Options, {fsm, undefined, self()}).
coord_put(IndexNode, BKey, Obj, ReqId, StartTime, Options, Sender)
when is_integer(StartTime) ->
riak_core_vnode_master:command(IndexNode,
?KV_PUT_REQ{
bkey = BKey,
object = Obj,
req_id = ReqId,
start_time = StartTime,
options = [coord | Options]},
Sender,
riak_kv_vnode_master).
%% Do a put without sending any replies
readrepair(Preflist, BKey, Obj, ReqId, StartTime, Options) ->
put(Preflist, BKey, Obj, ReqId, StartTime, [rr | Options], ignore).
list_keys(Preflist, ReqId, Caller, Bucket) ->
riak_core_vnode_master:command(Preflist,
#riak_kv_listkeys_req_v2{
bucket=Bucket,
req_id=ReqId,
caller=Caller},
ignore,
riak_kv_vnode_master).
fold(Preflist, Fun, Acc0) ->
riak_core_vnode_master:sync_spawn_command(Preflist,
?FOLD_REQ{
foldfun=Fun,
acc0=Acc0},
riak_kv_vnode_master).
get_vclocks(Preflist, BKeyList) ->
riak_core_vnode_master:sync_spawn_command(Preflist,
?KV_VCLOCK_REQ{bkeys=BKeyList},
riak_kv_vnode_master).
%% @doc Get status information about the node local vnodes.
-spec vnode_status([{partition(), pid()}]) -> [{atom(), term()}].
vnode_status(PrefLists) ->
ReqId = erlang:phash2({self(), os:timestamp()}),
%% Get the status of each vnode
riak_core_vnode_master:command(PrefLists,
?KV_VNODE_STATUS_REQ{},
{raw, ReqId, self()},
riak_kv_vnode_master),
wait_for_vnode_status_results(PrefLists, ReqId, []).
%% @doc Repair the given `Partition'.
-spec repair(partition()) ->
{ok, Pairs::[{partition(), node()}]} |
{down, Down::[{partition(), node()}]}.
repair(Partition) ->
Service = riak_kv,
MP = {riak_kv_vnode, Partition},
FilterModFun = {?MODULE, repair_filter},
riak_core_vnode_manager:repair(Service, MP, FilterModFun).
%% @doc Get the status of the repair process for the given `Partition'.
-spec repair_status(partition()) -> not_found | in_progress.
repair_status(Partition) ->
riak_core_vnode_manager:repair_status({riak_kv_vnode, Partition}).
%% @doc Given a `Target' partition generate a `Filter' fun to use
%% during partition repair.
-spec repair_filter(partition()) -> Filter::function().
repair_filter(Target) ->
{ok, Ring} = riak_core_ring_manager:get_my_ring(),
riak_core_repair:gen_filter(Target,
Ring,
bucket_nval_map(Ring),
default_object_nval(),
fun object_info/1).
-spec hashtree_pid(index()) -> {ok, pid()}.
hashtree_pid(Partition) ->
riak_core_vnode_master:sync_command({Partition, node()},
{hashtree_pid, node()},
riak_kv_vnode_master,
infinity).
%% Asynchronous version of {@link hashtree_pid/1} that sends a message back to
%% the calling process. Used by the {@link riak_kv_entropy_manager}.
-spec request_hashtree_pid(index()) -> ok.
request_hashtree_pid(Partition) ->
ReqId = {hashtree_pid, Partition},
riak_core_vnode_master:command({Partition, node()},
{hashtree_pid, node()},
{raw, ReqId, self()},
riak_kv_vnode_master).
%% Used by {@link riak_kv_exchange_fsm} to force a vnode to update the hashtree
%% for repaired keys. Typically, repairing keys will trigger read repair that
%% will update the AAE hash in the write path. However, if the AAE tree is
%% divergent from the KV data, it is possible that AAE will try to repair keys
%% that do not have divergent KV replicas. In that case, read repair is never
%% triggered. Always rehashing keys after any attempt at repair ensures that
%% AAE does not try to repair the same non-divergent keys over and over.
rehash(Preflist, Bucket, Key) ->
riak_core_vnode_master:command(Preflist,
{rehash, Bucket, Key},
ignore,
riak_kv_vnode_master).
-spec reformat_object(index(), {riak_object:bucket(), riak_object:key()}) ->
ok | {error, term()}.
reformat_object(Partition, BKey) ->
riak_core_vnode_master:sync_spawn_command({Partition, node()},
{reformat_object, BKey},
riak_kv_vnode_master).
%% VNode callbacks
init([Index]) ->
Mod = app_helper:get_env(riak_kv, storage_backend),
Configuration = app_helper:get_env(riak_kv),
BucketBufSize = app_helper:get_env(riak_kv, bucket_buffer_size, 1000),
IndexBufSize = app_helper:get_env(riak_kv, index_buffer_size, 100),
KeyBufSize = app_helper:get_env(riak_kv, key_buffer_size, 100),
WorkerPoolSize = app_helper:get_env(riak_kv, worker_pool_size, 10),
{ok, VId} = get_vnodeid(Index),
DeleteMode = app_helper:get_env(riak_kv, delete_mode, 3000),
AsyncFolding = app_helper:get_env(riak_kv, async_folds, true) == true,
case catch Mod:start(Index, Configuration) of
{ok, ModState} ->
%% Get the backend capabilities
State = #state{idx=Index,
async_folding=AsyncFolding,
mod=Mod,
modstate=ModState,
vnodeid=VId,
delete_mode=DeleteMode,
bucket_buf_size=BucketBufSize,
index_buf_size=IndexBufSize,
key_buf_size=KeyBufSize,
mrjobs=dict:new()},
case AsyncFolding of
true ->
%% Create worker pool initialization tuple
FoldWorkerPool = {pool, riak_kv_worker, WorkerPoolSize, []},
State2 = maybe_create_hashtrees(State),
{ok, State2, [FoldWorkerPool]};
false ->
{ok, State}
end;
{error, Reason} ->
lager:error("Failed to start ~p Reason: ~p",
[Mod, Reason]),
riak:stop("backend module failed to start."),
{error, Reason};
{'EXIT', Reason1} ->
lager:error("Failed to start ~p Reason: ~p",
[Mod, Reason1]),
riak:stop("backend module failed to start."),
{error, Reason1}
end.
handle_command(?KV_PUT_REQ{bkey=BKey,
object=Object,
req_id=ReqId,
start_time=StartTime,
options=Options},
Sender, State=#state{idx=Idx}) ->
StartTS = os:timestamp(),
riak_core_vnode:reply(Sender, {w, Idx, ReqId}),
UpdState = do_put(Sender, BKey, Object, ReqId, StartTime, Options, State),
update_vnode_stats(vnode_put, Idx, StartTS),
{noreply, UpdState};
handle_command(?KV_GET_REQ{bkey=BKey,req_id=ReqId},Sender,State) ->
do_get(Sender, BKey, ReqId, State);
handle_command(#riak_kv_listkeys_req_v2{bucket=Input, req_id=ReqId, caller=Caller}, _Sender,
State=#state{async_folding=AsyncFolding,
key_buf_size=BufferSize,
mod=Mod,
modstate=ModState,
idx=Idx}) ->
case Input of
{filter, Bucket, Filter} ->
ok;
Bucket ->
Filter = none
end,
BufferMod = riak_kv_fold_buffer,
case Bucket of
'_' ->
{ok, Capabilities} = Mod:capabilities(ModState),
AsyncBackend = lists:member(async_fold, Capabilities),
case AsyncFolding andalso AsyncBackend of
true ->
Opts = [async_fold];
false ->
Opts = []
end,
BufferFun =
fun(Results) ->
UniqueResults = lists:usort(Results),
Caller ! {ReqId, {kl, Idx, UniqueResults}}
end,
FoldFun = fold_fun(buckets, BufferMod, Filter),
ModFun = fold_buckets;
_ ->
{ok, Capabilities} = Mod:capabilities(Bucket, ModState),
AsyncBackend = lists:member(async_fold, Capabilities),
case AsyncFolding andalso AsyncBackend of
true ->
Opts = [async_fold, {bucket, Bucket}];
false ->
Opts = [{bucket, Bucket}]
end,
BufferFun =
fun(Results) ->
Caller ! {ReqId, {kl, Idx, Results}}
end,
FoldFun = fold_fun(keys, BufferMod, Filter),
ModFun = fold_keys
end,
Buffer = BufferMod:new(BufferSize, BufferFun),
FinishFun =
fun(Buffer1) ->
riak_kv_fold_buffer:flush(Buffer1),
Caller ! {ReqId, Idx, done}
end,
case list(FoldFun, FinishFun, Mod, ModFun, ModState, Opts, Buffer) of
{async, AsyncWork} ->
{async, {fold, AsyncWork, FinishFun}, Caller, State};
_ ->
{noreply, State}
end;
handle_command(?KV_DELETE_REQ{bkey=BKey, req_id=ReqId}, _Sender, State) ->
do_delete(BKey, ReqId, State);
handle_command(?KV_VCLOCK_REQ{bkeys=BKeys}, _Sender, State) ->
{reply, do_get_vclocks(BKeys, State), State};
handle_command(?FOLD_REQ{foldfun=FoldFun, acc0=Acc0}, Sender, State) ->
%% The function in riak_core used for object folding expects the
%% bucket and key pair to be passed as the first parameter, but in
%% riak_kv the bucket and key have been separated. This function
%% wrapper is to address this mismatch.
FoldWrapper = fun(Bucket, Key, Value, Acc) ->
FoldFun({Bucket, Key}, Value, Acc)
end,
do_fold(FoldWrapper, Acc0, Sender, State);
%% entropy exchange commands
handle_command({hashtree_pid, Node}, _, State=#state{hashtrees=HT}) ->
%% Handle riak_core request forwarding during ownership handoff.
case node() of
Node ->
%% Following is necessary in cases where anti-entropy was enabled
%% after the vnode was already running
case HT of
undefined ->
State2 = maybe_create_hashtrees(State),
{reply, {ok, State2#state.hashtrees}, State2};
_ ->
{reply, {ok, HT}, State}
end;
_ ->
{reply, {error, wrong_node}, State}
end;
handle_command({rehash, Bucket, Key}, _, State=#state{mod=Mod, modstate=ModState}) ->
case do_get_binary({Bucket, Key}, Mod, ModState) of
{ok, Bin, _UpdModState} ->
update_hashtree(Bucket, Key, Bin, State);
_ ->
%% Make sure hashtree isn't tracking deleted data
riak_kv_index_hashtree:delete({Bucket, Key}, State#state.hashtrees)
end,
{noreply, State};
%% Commands originating from inside this vnode
handle_command({backend_callback, Ref, Msg}, _Sender,
State=#state{mod=Mod, modstate=ModState}) ->
Mod:callback(Ref, Msg, ModState),
{noreply, State};
handle_command({mapexec_error_noretry, JobId, Err}, _Sender, #state{mrjobs=Jobs}=State) ->
NewState = case dict:find(JobId, Jobs) of
{ok, Job} ->
Jobs1 = dict:erase(JobId, Jobs),
#mrjob{target=Target} = Job,
gen_fsm:send_event(Target, {mapexec_error_noretry, self(), Err}),
State#state{mrjobs=Jobs1};
error ->
State
end,
{noreply, NewState};
handle_command({mapexec_reply, JobId, Result}, _Sender, #state{mrjobs=Jobs}=State) ->
NewState = case dict:find(JobId, Jobs) of
{ok, Job} ->
Jobs1 = dict:erase(JobId, Jobs),
#mrjob{target=Target} = Job,
gen_fsm:send_event(Target, {mapexec_reply, Result, self()}),
State#state{mrjobs=Jobs1};
error ->
State
end,
{noreply, NewState};
handle_command(?KV_VNODE_STATUS_REQ{},
_Sender,
State=#state{idx=Index,
mod=Mod,
modstate=ModState}) ->
BackendStatus = {backend_status, Mod, Mod:status(ModState)},
VNodeStatus = [BackendStatus],
{reply, {vnode_status, Index, VNodeStatus}, State};
handle_command({reformat_object, BKey}, _Sender, State) ->
{Reply, UpdState} = do_reformat(BKey, State),
{reply, Reply, UpdState};
handle_command({fix_incorrect_index_entry, {done, ForUpgrade}}, _Sender,
State=#state{mod=Mod, modstate=ModState}) ->
case Mod:mark_indexes_fixed(ModState, ForUpgrade) of %% only defined for eleveldb backend
{ok, NewModState} ->
{reply, ok, State#state{modstate=NewModState}};
{error, _Reason} ->
{reply, error, State}
end;
handle_command({fix_incorrect_index_entry, Keys, ForUpgrade},
_Sender,
State=#state{mod=Mod,
modstate=ModState}) ->
Reply =
case Mod:fix_index(Keys, ForUpgrade, ModState) of
{ok, _UpModState} ->
ok;
{ignore, _UpModState} ->
ignore;
{error, Reason, _UpModState} ->
{error, Reason};
{reply, Totals, _UpModState} ->
Totals
end,
{reply, Reply, State};
handle_command({get_index_entries, Opts},
Sender,
State=#state{mod=Mod,
modstate=ModState0}) ->
ForUpgrade = not proplists:get_value(downgrade, Opts, false),
BufferSize = proplists:get_value(batch_size, Opts, 1),
{ok, Caps} = Mod:capabilities(ModState0),
case lists:member(index_reformat, Caps) of
true ->
ModState = Mod:set_legacy_indexes(ModState0, not ForUpgrade),
Status = Mod:fixed_index_status(ModState),
case {ForUpgrade, Status} of
{true, true} -> {reply, done, State};
{_, _} ->
BufferMod = riak_kv_fold_buffer,
ResultFun =
fun(Results) ->
% Send result batch and wait for acknowledgement
% before moving on (backpressure to avoid flooding caller).
BatchRef = make_ref(),
riak_core_vnode:reply(Sender, {self(), BatchRef, Results}),
Monitor = riak_core_vnode:monitor(Sender),
receive
{ack_keys, BatchRef} ->
erlang:demonitor(Monitor, [flush]);
{'DOWN', Monitor, process, _Pid, _Reason} ->
throw(index_reformat_client_died)
end
end,
Buffer = BufferMod:new(BufferSize, ResultFun),
FoldFun = fun(B, K, Buf) -> BufferMod:add({B, K}, Buf) end,
FinishFun =
fun(FinalBuffer) ->
BufferMod:flush(FinalBuffer),
riak_core_vnode:reply(Sender, done)
end,
FoldOpts = [{index, incorrect_format, ForUpgrade}, async_fold],
case list(FoldFun, FinishFun, Mod, fold_keys, ModState, FoldOpts, Buffer) of
{async, AsyncWork} ->
{async, {fold, AsyncWork, FinishFun}, Sender, State};
_ ->
{noreply, State}
end
end;
false ->
lager:error("Backend ~p does not support incorrect index query", [Mod]),
{reply, ignore, State}
end.
%% @doc Handle a coverage request.
%% More information about the specification for the ItemFilter
%% parameter can be found in the documentation for the
%% {@link riak_kv_coverage_filter} module.
handle_coverage(?KV_LISTBUCKETS_REQ{item_filter=ItemFilter},
_FilterVNodes,
Sender,
State=#state{async_folding=AsyncFolding,
bucket_buf_size=BufferSize,
mod=Mod,
modstate=ModState}) ->
%% Construct the filter function
Filter = riak_kv_coverage_filter:build_filter(all, ItemFilter, undefined),
BufferMod = riak_kv_fold_buffer,
Buffer = BufferMod:new(BufferSize, result_fun(Sender)),
FoldFun = fold_fun(buckets, BufferMod, Filter),
FinishFun = finish_fun(BufferMod, Sender),
{ok, Capabilities} = Mod:capabilities(ModState),
AsyncBackend = lists:member(async_fold, Capabilities),
case AsyncFolding andalso AsyncBackend of
true ->
Opts = [async_fold];
false ->
Opts = []
end,
case list(FoldFun, FinishFun, Mod, fold_buckets, ModState, Opts, Buffer) of
{async, AsyncWork} ->
{async, {fold, AsyncWork, FinishFun}, Sender, State};
_ ->
{noreply, State}
end;
handle_coverage(#riak_kv_listkeys_req_v3{bucket=Bucket,
item_filter=ItemFilter},
FilterVNodes, Sender, State) ->
%% v3 == no backpressure
ResultFun = result_fun(Bucket, Sender),
Opts = [{bucket, Bucket}],
handle_coverage_keyfold(Bucket, ItemFilter, ResultFun,
FilterVNodes, Sender, Opts, State);
handle_coverage(?KV_LISTKEYS_REQ{bucket=Bucket,
item_filter=ItemFilter},
FilterVNodes, Sender, State) ->
%% v4 == ack-based backpressure
ResultFun = result_fun_ack(Bucket, Sender),
Opts = [{bucket, Bucket}],
handle_coverage_keyfold(Bucket, ItemFilter, ResultFun,
FilterVNodes, Sender, Opts, State);
handle_coverage(#riak_kv_index_req_v1{bucket=Bucket,
item_filter=ItemFilter,
qry=Query},
FilterVNodes, Sender, State) ->
%% v1 == no backpressure
handle_coverage_index(Bucket, ItemFilter, Query,
FilterVNodes, Sender, State, fun result_fun/2);
handle_coverage(?KV_INDEX_REQ{bucket=Bucket,
item_filter=ItemFilter,
qry=Query},
FilterVNodes, Sender, State) ->
%% v2 = ack-based backpressure
handle_coverage_index(Bucket, ItemFilter, Query,
FilterVNodes, Sender, State, fun result_fun_ack/2).
handle_coverage_index(Bucket, ItemFilter, Query,
FilterVNodes, Sender,
State=#state{mod=Mod,
modstate=ModState},
ResultFunFun) ->
{ok, Capabilities} = Mod:capabilities(Bucket, ModState),
IndexBackend = lists:member(indexes, Capabilities),
case IndexBackend of
true ->
%% Update stats...
riak_kv_stat:update(vnode_index_read),
ResultFun = ResultFunFun(Bucket, Sender),
Opts = [{index, Bucket, Query},
{bucket, Bucket}],
handle_coverage_keyfold(Bucket, ItemFilter, ResultFun,
FilterVNodes, Sender, Opts, State);
false ->
{reply, {error, {indexes_not_supported, Mod}}, State}
end.
%% Convenience for handling both v3 and v4 coverage-based key fold operations
handle_coverage_keyfold(Bucket, ItemFilter, ResultFun,
FilterVNodes, Sender, Opts0,
State=#state{async_folding=AsyncFolding,
idx=Index,
key_buf_size=BufferSize,
mod=Mod,
modstate=ModState}) ->
%% Construct the filter function
FilterVNode = proplists:get_value(Index, FilterVNodes),
Filter = riak_kv_coverage_filter:build_filter(Bucket, ItemFilter, FilterVNode),
BufferMod = riak_kv_fold_buffer,
Buffer = BufferMod:new(BufferSize, ResultFun),
FoldFun = fold_fun(keys, BufferMod, Filter),
FinishFun = finish_fun(BufferMod, Sender),
{ok, Capabilities} = Mod:capabilities(Bucket, ModState),
AsyncBackend = lists:member(async_fold, Capabilities),
case AsyncFolding andalso AsyncBackend of
true ->
Opts = [async_fold | Opts0];
false ->
Opts = Opts0
end,
case list(FoldFun, FinishFun, Mod, fold_keys, ModState, Opts, Buffer) of
{async, AsyncWork} ->
{async, {fold, AsyncWork, FinishFun}, Sender, State};
_ ->
{noreply, State}
end.
%% While in handoff, vnodes have the option of returning {forward, State}
%% which will cause riak_core to forward the request to the handoff target
%% node. For riak_kv, we issue a put locally as well as forward it in case
%% the vnode has already handed off the previous version. All other requests
%% are handled locally and not forwarded since the relevant data may not have
%% yet been handed off to the target node. Since we do not forward deletes it
%% is possible that we do not clear a tombstone that was already handed off.
%% This is benign as the tombstone will eventually be re-deleted.
handle_handoff_command(Req=?KV_PUT_REQ{}, Sender, State) ->
{noreply, NewState} = handle_command(Req, Sender, State),
{forward, NewState};
%% Handle all unspecified cases locally without forwarding
handle_handoff_command(Req, Sender, State) ->
handle_command(Req, Sender, State).
handoff_starting(_TargetNode, State) ->
{true, State#state{in_handoff=true}}.
handoff_cancelled(State) ->
{ok, State#state{in_handoff=false}}.
handoff_finished(_TargetNode, State) ->
{ok, State}.
handle_handoff_data(BinObj, State) ->
PBObj = riak_core_pb:decode_riakobject_pb(zlib:unzip(BinObj)),
{B, K} = BKey = {PBObj#riakobject_pb.bucket,PBObj#riakobject_pb.key},
case do_diffobj_put(BKey, riak_object:from_binary(B, K, PBObj#riakobject_pb.val), State) of
{ok, UpdModState} ->
{reply, ok, State#state{modstate=UpdModState}};
{error, Reason, UpdModState} ->
{reply, {error, Reason}, State#state{modstate=UpdModState}};
Err ->
{reply, {error, Err}, State}
end.
encode_handoff_item({B, K}, V) ->
%% before sending data to another node change binary version
%% to one supported by the cluster. This way we don't send
%% unsupported formats to old nodes
ObjFmt = riak_core_capability:get({riak_kv, object_format}, v0),
Val = riak_object:to_binary_version(ObjFmt, B, K, V),
zlib:zip(riak_core_pb:encode_riakobject_pb(
#riakobject_pb{bucket=B, key=K, val=Val})).
is_empty(State=#state{mod=Mod, modstate=ModState}) ->
{Mod:is_empty(ModState), State}.
delete(State=#state{idx=Index,mod=Mod, modstate=ModState}) ->
%% clear vnodeid first, if drop removes data but fails
%% want to err on the side of creating a new vnodeid
{ok, cleared} = clear_vnodeid(Index),
case Mod:drop(ModState) of
{ok, UpdModState} ->
ok;
{error, Reason, UpdModState} ->
lager:error("Failed to drop ~p. Reason: ~p~n", [Mod, Reason]),
ok
end,
case State#state.hashtrees of
undefined ->
ok;
HT ->
riak_kv_index_hashtree:destroy(HT)
end,
{ok, State#state{modstate=UpdModState,vnodeid=undefined,hashtrees=undefined}}.
terminate(_Reason, #state{mod=Mod, modstate=ModState}) ->
Mod:stop(ModState),
ok.
handle_info(retry_create_hashtree, State=#state{hashtrees=undefined}) ->
State2 = maybe_create_hashtrees(State),
case State2#state.hashtrees of
undefined ->
ok;
_ ->
lager:info("riak_kv/~p: successfully started index_hashtree on retry",
[State#state.idx])
end,
{ok, State2};
handle_info(retry_create_hashtree, State) ->
{ok, State};
handle_info({'DOWN', _, _, Pid, _}, State=#state{hashtrees=Pid}) ->
State2 = State#state{hashtrees=undefined},
State3 = maybe_create_hashtrees(State2),
{ok, State3};
handle_info({'DOWN', _, _, _, _}, State) ->
{ok, State};
handle_info({final_delete, BKey, RObjHash}, State = #state{mod=Mod, modstate=ModState}) ->
UpdState = case do_get_term(BKey, Mod, ModState) of
{ok, RObj} ->
case delete_hash(RObj) of
RObjHash ->
do_backend_delete(BKey, RObj, State);
_ ->
State
end;
_ ->
State
end,
{ok, UpdState}.
handle_exit(_Pid, Reason, State) ->
%% A linked processes has died so the vnode
%% process should take appropriate action here.
%% The default behavior is to crash the vnode
%% process so that it can be respawned
%% by riak_core_vnode_master to prevent
%% messages from stacking up on the process message
%% queue and never being processed.
lager:error("Linked process exited. Reason: ~p", [Reason]),
{stop, linked_process_crash, State}.
%% @private
%% upon receipt of a client-initiated put
do_put(Sender, {Bucket,_Key}=BKey, RObj, ReqID, StartTime, Options, State) ->
case proplists:get_value(bucket_props, Options) of
undefined ->
{ok,Ring} = riak_core_ring_manager:get_my_ring(),
BProps = riak_core_bucket:get_bucket(Bucket, Ring);
BProps ->
BProps
end,
case proplists:get_value(rr, Options, false) of
true ->
PruneTime = undefined;
false ->
PruneTime = StartTime
end,
Coord = proplists:get_value(coord, Options, false),
PutArgs = #putargs{returnbody=proplists:get_value(returnbody,Options,false) orelse Coord,
coord=Coord,
lww=proplists:get_value(last_write_wins, BProps, false),
bkey=BKey,
robj=RObj,
reqid=ReqID,
bprops=BProps,
starttime=StartTime,
prunetime=PruneTime},
{PrepPutRes, UpdPutArgs} = prepare_put(State, PutArgs),
{Reply, UpdState} = perform_put(PrepPutRes, State, UpdPutArgs),
riak_core_vnode:reply(Sender, Reply),
update_index_write_stats(UpdPutArgs#putargs.is_index, UpdPutArgs#putargs.index_specs),
UpdState.
do_backend_delete(BKey, RObj, State = #state{mod = Mod, modstate = ModState}) ->
%% object is a tombstone or all siblings are tombstones
%% Calculate the index specs to remove...
%% JDM: This should just be a tombstone by this point, but better
%% safe than sorry.
IndexSpecs = riak_object:diff_index_specs(undefined, RObj),
%% Do the delete...
{Bucket, Key} = BKey,
case Mod:delete(Bucket, Key, IndexSpecs, ModState) of
{ok, UpdModState} ->
riak_kv_index_hashtree:delete(BKey, State#state.hashtrees),
update_index_delete_stats(IndexSpecs),
State#state{modstate = UpdModState};
{error, _Reason, UpdModState} ->
State#state{modstate = UpdModState}
end.
%% Compute a hash of the deleted object
delete_hash(RObj) ->
erlang:phash2(RObj, 4294967296).
prepare_put(State=#state{vnodeid=VId,
mod=Mod,
modstate=ModState},
PutArgs=#putargs{bkey={Bucket, _Key},
lww=LWW,
coord=Coord,
robj=RObj,
starttime=StartTime}) ->
%% Can we avoid reading the existing object? If this is not an
%% index backend, and the bucket is set to last-write-wins, then
%% no need to incur additional get. Otherwise, we need to read the
%% old object to know how the indexes have changed.
{ok, Capabilities} = Mod:capabilities(Bucket, ModState),
IndexBackend = lists:member(indexes, Capabilities),
case LWW andalso not IndexBackend of
true ->
ObjToStore =
case Coord of
true ->
riak_object:increment_vclock(RObj, VId, StartTime);
false ->
RObj
end,
{{true, ObjToStore}, PutArgs#putargs{is_index = false}};
false ->
prepare_put(State, PutArgs, IndexBackend)
end.
prepare_put(#state{idx=Idx,
vnodeid=VId,
mod=Mod,
modstate=ModState},
PutArgs=#putargs{bkey={Bucket, Key},
robj=RObj,
bprops=BProps,
coord=Coord,
lww=LWW,
starttime=StartTime,
prunetime=PruneTime},
IndexBackend) ->
GetReply =
case Mod:get(Bucket, Key, ModState) of
{error, not_found, _UpdModState} ->
ok;
% NOTE: bad_crc is NOT an official backend response. It is
% specific to bitcask currently and handling it may be changed soon.
% A standard set of responses will be agreed on
% https://github.com/basho/riak_kv/issues/496
{error, bad_crc, _UpdModState} ->
lager:info("Bad CRC detected while reading Partition=~p, Bucket=~p, Key=~p", [Idx, Bucket, Key]),
ok;
{ok, GetVal, _UpdModState} ->
{ok, GetVal}
end,
case GetReply of
ok ->
case IndexBackend of
true ->
IndexSpecs = riak_object:index_specs(RObj);
false ->
IndexSpecs = []
end,
ObjToStore = case Coord of
true ->
riak_object:increment_vclock(RObj, VId, StartTime);
false ->
RObj
end,
{{true, ObjToStore}, PutArgs#putargs{index_specs=IndexSpecs, is_index=IndexBackend}};
{ok, Val} ->
OldObj = object_from_binary(Bucket, Key, Val),
case put_merge(Coord, LWW, OldObj, RObj, VId, StartTime) of
{oldobj, OldObj1} ->
{{false, OldObj1}, PutArgs};
{newobj, NewObj} ->
VC = riak_object:vclock(NewObj),
AMObj = enforce_allow_mult(NewObj, BProps),
case IndexBackend of
true ->
IndexSpecs =
riak_object:diff_index_specs(AMObj,
OldObj);
false ->
IndexSpecs = []
end,
case PruneTime of
undefined ->
ObjToStore = AMObj;
_ ->
ObjToStore =
riak_object:set_vclock(AMObj,
vclock:prune(VC,
PruneTime,
BProps))
end,
{{true, ObjToStore},
PutArgs#putargs{index_specs=IndexSpecs, is_index=IndexBackend}}
end
end.
perform_put({false, Obj},
#state{idx=Idx}=State,
#putargs{returnbody=true,
reqid=ReqID}) ->
{{dw, Idx, Obj, ReqID}, State};
perform_put({false, _Obj},
#state{idx=Idx}=State,
#putargs{returnbody=false,
reqid=ReqId}) ->
{{dw, Idx, ReqId}, State};
perform_put({true, Obj},
#state{idx=Idx,
mod=Mod,
modstate=ModState}=State,
#putargs{returnbody=RB,
bkey={Bucket, Key},