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Reintroduce riak metadata extraction

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The full riak metadata had been stripped from the Ledger update for
performance reasons.  However, the full metadata is required in order to
save a GET before a PUT.  Therefore we want to do isolated testing on
this change to establish the relative cost value in that cost saving.
This commit is contained in:
martinsumner 2016-12-14 10:27:11 +00:00
parent bc5190a9bd
commit f4e2e274e0
1 changed files with 45 additions and 9 deletions
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54
src/leveled_codec.erl
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@ -363,8 +363,8 @@ build_metadata_object(PrimaryKey, MD) ->
{Tag, _Bucket, _Key, null} = PrimaryKey,
case Tag of
?RIAK_TAG ->
{SibCount, Vclock, _Hash, _Size} = MD,
riak_metadata_to_binary(Vclock, SibCount);
{SibData, Vclock, _Hash, _Size} = MD,
riak_metadata_to_binary(Vclock, SibData);
?STD_TAG ->
MD
end.
@ -373,24 +373,60 @@ build_metadata_object(PrimaryKey, MD) ->
riak_extract_metadata(delete, Size) ->
{delete, null, null, Size};
riak_extract_metadata(ObjBin, Size) ->
{Vclock, SibCount} = riak_metadata_from_binary(ObjBin),
{SibCount, Vclock, erlang:phash2(ObjBin), Size}.
{Vclock, SibData} = riak_metadata_from_binary(ObjBin),
{SibData, Vclock, erlang:phash2(ObjBin), Size}.
%% <<?MAGIC:8/integer, ?V1_VERS:8/integer, VclockLen:32/integer,
%%% VclockBin/binary, SibCount:32/integer, SibsBin/binary>>.
riak_metadata_to_binary(Vclock, SibCount) ->
riak_metadata_to_binary(Vclock, SibData) ->
VclockBin = term_to_binary(Vclock),
VclockLen = byte_size(VclockBin),
% <<?MAGIC:8/integer, ?V1_VERS:8/integer, VclockLen:32/integer,
% VclockBin:VclockLen/binary, SibData:32/integer>>.
SibCount = length(SibData),
SibsBin = slimbin_contents(SibData),
<<?MAGIC:8/integer, ?V1_VERS:8/integer, VclockLen:32/integer,
VclockBin:VclockLen/binary, SibCount:32/integer>>.
VclockBin:VclockLen/binary, SibCount:32/integer, SibsBin/binary>>.
riak_metadata_from_binary(V1Binary) ->
<<?MAGIC:8/integer, ?V1_VERS:8/integer, VclockLen:32/integer,
Rest/binary>> = V1Binary,
<<VclockBin:VclockLen/binary, SibCount:32/integer, _Rest/binary>> = Rest,
{binary_to_term(VclockBin), SibCount}.
% Just grab the Sibling count and not the full metadata
% <<VclockBin:VclockLen/binary, SibCount:32/integer, _Rest/binary>> = Rest,
% {binary_to_term(VclockBin), SibCount}.
<<VclockBin:VclockLen/binary, SibCount:32/integer, SibsBin/binary>> = Rest,
SibMetaBinList =
case SibCount of
0 ->
[];
SC when is_integer(SC) ->
get_metadata_from_siblings(SibsBin, SibCount, [])
end,
{binary_to_term(VclockBin), SibMetaBinList}.
% Fixes the value length for each sibling to be zero, and so includes no value
slimbin_content(MetaBin) ->
MetaLen = byte_size(MetaBin),
<<0:32/integer, MetaLen:32/integer, MetaBin:MetaLen/binary>>.
slimbin_contents(SibMetaBinList) ->
F = fun(MetaBin, Acc) ->
<<Acc/binary, (slimbin_content(MetaBin))/binary>>
end,
lists:foldl(F, <<>>, SibMetaBinList).
get_metadata_from_siblings(<<>>, 0, SibMetaBinList) ->
SibMetaBinList;
get_metadata_from_siblings(<<ValLen:32/integer, Rest0/binary>>,
SibCount,
SibMetaBinList) ->
<<_ValBin:ValLen/binary, MetaLen:32/integer, Rest1/binary>> = Rest0,
<<MetaBin:MetaLen/binary, Rest2/binary>> = Rest1,
get_metadata_from_siblings(Rest2,
SibCount - 1,
[MetaBin|SibMetaBinList]).