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Merging 1.7.1 [JIRA: RIAK-1921] #201

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Oct 17, 2014
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136 changes: 136 additions & 0 deletions priv/scripts/downgrade_bitcask.erl
Original file line number Diff line number Diff line change
@@ -0,0 +1,136 @@
% Run this script to downgrade Bitcask files from the format
% introduced in Riak 2.0 to the format used in Riak 1.4
% Run it by calling escript on it and pointing it to a data
% directory after stopping the Riak node.
% The script will recursively find all Bitcask files under that
% directory and reformat them.
% $ escript downgrade_bitcask.erl /my/riak/data/bitcask
-module(downgrade_bitcask).
-mode(compile).
-export([main/1]).

-define(HEADER_SIZE, 14).
-record(entry, { crc, tstamp, keysz, valsz, key, val}).

main([DataDir]) ->
downgrade_if_dir(DataDir).

maybe_downgrade_file(F) ->
is_bitcask_file(F) andalso downgrade_file(F).

downgrade_if_dir(Dir) ->
case filelib:is_dir(Dir) of
true ->
downgrade_dir(Dir);
false ->
ok
end.

downgrade_dir(Dir) ->
{ok, Children0} = file:list_dir(Dir),
Children = [filename:join(Dir, Child) || Child <- Children0],
case is_bitcask_dir(Dir) of
false ->
[downgrade_if_dir(Child) || Child <- Children];
true ->
[maybe_downgrade_file(Child) || Child <- Children]
end.

is_bitcask_file(Filename0) ->
Filename = filename:basename(Filename0),
Match = re:run(Filename, "^\\d+\\.bitcask\\.data$"),
nomatch =/= Match.

is_bitcask_dir(Dir) ->
case filelib:is_dir(Dir) of
false ->
false;
true ->
{ok, Files} = file:list_dir(Dir),
lists:any(fun is_bitcask_file/1, Files)
end.

read_entry(F) ->
case file:read(F, ?HEADER_SIZE) of
{ok, <<CRC:32,Tstamp:32,KeySz:16,ValueSz:32>>} ->
case file:read(F, KeySz+ValueSz) of
{ok, <<Key:KeySz/bytes, Value:ValueSz/bytes>>} ->
% io:format("K: ~p, V: ~p\n", [Key, Value]),
{ok, #entry{crc=CRC, tstamp=Tstamp, keysz=KeySz, valsz=ValueSz,
key=Key, val=Value}};
_ ->
error
end;
eof ->
eof;
_ ->
io:format("Error reading entry\n"),
error
end.

downgrade_file(F) ->
Dir = filename:dirname(F),
NewF = F ++ ".new",
HintFile = filename:join(Dir, filename:basename(F, ".data")++".hint"),
NewHF = HintFile ++ ".new",
io:format("Downgrading file ~s\n", [F]),
{ok, Fi} = file:open(F, [read, raw, binary]),
{ok, Fo} = file:open(NewF, [write, raw, binary]),
{ok, Fh} = file:open(NewHF, [write, raw, binary]),
ok = convert_file(Fi, Fo, Fh, 0, 0, fun tx_pre_20/1),
ok = file:close(Fi),
ok = file:close(Fo),
ok = file:close(Fh),
HintBak = HintFile ++ ".bak",
FBak = F ++ ".bak",
ok = file:rename(HintFile, HintBak),
ok = file:rename(F, FBak),
ok = file:rename(NewF, F),
ok = file:rename(NewHF, HintFile),
ok = file:delete(HintBak),
ok = file:delete(FBak),
ok.

convert_file(Fi, Fo, Fh, Ofs, Crc, Tx) ->
case read_entry(Fi) of
{ok, Entry} ->
NewEntry = Tx(Entry),
Sz = write_entry(Fo, NewEntry),
NewCrc = write_hint_entry(Fh, Ofs, Sz, Crc, NewEntry),
convert_file(Fi, Fo, Fh, Ofs+Sz, NewCrc, Tx);
eof ->
write_hint_entry(Fh, 16#ffffFFFFffffFFFF, Crc, 0,
#entry{key= <<>>, tstamp=0}),
% io:format("Finished reading file\n", []),
ok;
_ ->
io:format(standard_error, "Error reading file\n", []),
error
end.

write_hint_entry(F, Ofs, Sz, Crc, #entry{key=Key, tstamp=Tstamp}) ->
KeySz = size(Key),
Hint = [<<Tstamp:32, KeySz:16, Sz:32, Ofs:64>>, Key],
ok = file:write(F, Hint),
erlang:crc32(Crc, Hint).

write_entry(F, #entry {key=Key, val=Value, tstamp=Tstamp}) ->
KeySz = size(Key),
ValueSz = size(Value),
Bytes0 = [<<Tstamp:32>>, <<KeySz:16>>, <<ValueSz:32>>, Key, Value],
Bytes = [<<(erlang:crc32(Bytes0)):32>> | Bytes0],
ok = file:write(F, Bytes),
iolist_size(Bytes).

tx_pre_20(Entry =
#entry{key= <<2, BucketSz:16, Bucket:BucketSz/binary,
Key/binary>>}) ->
OldKey=term_to_binary({Bucket, Key}),
% io:format("Converted B/K ~s/~s\n", [Bucket, Key]),
tx_pre_20(Entry#entry{key=OldKey, keysz=size(OldKey)});
tx_pre_20(Entry=
#entry{val= <<"bitcask_tombstone2", _/binary>>}) ->
NewVal = <<"bitcask_tombstone">>,
Entry#entry{val=NewVal, valsz=size(NewVal)};
tx_pre_20(Entry) ->
Entry.
2 changes: 1 addition & 1 deletion rebar.config
Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@

{deps, [
{meck, "0.8.1", {git, "git://github.com/basho/meck.git", {tag, "0.8.1"}}},
{cuttlefish, ".*", {git, "git://github.com/basho/cuttlefish.git", {tag, "2.0.0"}}}
{cuttlefish, ".*", {git, "git://github.com/basho/cuttlefish.git", {branch, "develop"}}}
]}.

{port_env,
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