diff options
Diffstat (limited to 'lib/mnesia')
| -rw-r--r-- | lib/mnesia/doc/src/mnesia.xml | 11 | ||||
| -rw-r--r-- | lib/mnesia/src/mnesia.erl | 2 | ||||
| -rw-r--r-- | lib/mnesia/src/mnesia_loader.erl | 35 | ||||
| -rw-r--r-- | lib/mnesia/src/mnesia_monitor.erl | 10 |
4 files changed, 53 insertions, 5 deletions
diff --git a/lib/mnesia/doc/src/mnesia.xml b/lib/mnesia/doc/src/mnesia.xml index 3484cd104a..33387a88f4 100644 --- a/lib/mnesia/doc/src/mnesia.xml +++ b/lib/mnesia/doc/src/mnesia.xml @@ -3045,6 +3045,17 @@ raise(Name, Amount) -> </p> </item> <item> + <p><c>-mnesia send_compressed Level</c> specifies the level of + compression to be used when copying a table from the local node to + another one. The default level is 0. + </p> + <p><c>Level</c> must be an integer in the interval [0, 9], with 0 + representing no compression and 9 representing maximum compression. + Before setting it to a non-zero value, make sure the remote nodes + understand this configuration. + </p> + </item> + <item> <p><c>-mnesia schema_location Loc</c> controls where Mnesia will look for its schema. The parameter <c>Loc</c> may be one of the following atoms: </p> diff --git a/lib/mnesia/src/mnesia.erl b/lib/mnesia/src/mnesia.erl index 9a630f18eb..c9599a1911 100644 --- a/lib/mnesia/src/mnesia.erl +++ b/lib/mnesia/src/mnesia.erl @@ -2200,6 +2200,7 @@ system_info2(transaction_log_writes) -> mnesia_dumper:get_log_writes(); system_info2(core_dir) -> mnesia_monitor:get_env(core_dir); system_info2(no_table_loaders) -> mnesia_monitor:get_env(no_table_loaders); system_info2(dc_dump_limit) -> mnesia_monitor:get_env(dc_dump_limit); +system_info2(send_compressed) -> mnesia_monitor:get_env(send_compressed); system_info2(Item) -> exit({badarg, Item}). @@ -2244,6 +2245,7 @@ system_info_items(yes) -> core_dir, no_table_loaders, dc_dump_limit, + send_compressed, version ]; system_info_items(no) -> diff --git a/lib/mnesia/src/mnesia_loader.erl b/lib/mnesia/src/mnesia_loader.erl index 77c317abc5..5657f6e299 100644 --- a/lib/mnesia/src/mnesia_loader.erl +++ b/lib/mnesia/src/mnesia_loader.erl @@ -438,6 +438,9 @@ make_table_fun(Pid, TabRec) -> get_data(Pid, TabRec) -> receive + {Pid, {more_z, CompressedRecs}} when is_binary(CompressedRecs) -> + Pid ! {TabRec, more}, + {zlib_uncompress(CompressedRecs), make_table_fun(Pid,TabRec)}; {Pid, {more, Recs}} -> Pid ! {TabRec, more}, {Recs, make_table_fun(Pid,TabRec)}; @@ -769,6 +772,27 @@ dets_bchunk(Tab, Chunk) -> %% Arrg Else -> Else end. +zlib_compress(Data, Level) -> + BinData = term_to_binary(Data), + Z = zlib:open(), + zlib:deflateInit(Z, Level), + Bs = zlib:deflate(Z, BinData, finish), + zlib:deflateEnd(Z), + zlib:close(Z), + list_to_binary(Bs). + +zlib_uncompress(Data) when is_binary(Data) -> + binary_to_term(zlib:uncompress(Data)). + +compression_level() -> + NoCompression = 0, + case ?catch_val(send_compressed) of + {'EXIT', _} -> + mnesia_lib:set(send_compressed, NoCompression), + NoCompression; + Val -> Val + end. + send_packet(N, Pid, _Chunk, '$end_of_table', OldNode) -> case OldNode of true -> ignore; %% Old nodes can't handle the new no_more @@ -779,8 +803,15 @@ send_packet(N, Pid, Chunk, {[], Cont}, OldNode) -> send_packet(N, Pid, Chunk, Chunk(Cont), OldNode); send_packet(N, Pid, Chunk, {Recs, Cont}, OldNode) when N < ?MAX_NOPACKETS -> case OldNode of - true -> Pid ! {self(), {more, [Recs]}}; %% Old need's wrapping list - false -> Pid ! {self(), {more, Recs}} + true -> + Pid ! {self(), {more, [Recs]}}; %% Old need's wrapping list + false -> + case compression_level() of + 0 -> + Pid ! {self(), {more, Recs}}; + Level -> + Pid ! {self(), {more_z, zlib_compress(Recs, Level)}} + end end, send_packet(N+1, Pid, Chunk, Chunk(Cont), OldNode); send_packet(_N, _Pid, _Chunk, DataState, _OldNode) -> diff --git a/lib/mnesia/src/mnesia_monitor.erl b/lib/mnesia/src/mnesia_monitor.erl index 05ae943e3b..b39ee92fa8 100644 --- a/lib/mnesia/src/mnesia_monitor.erl +++ b/lib/mnesia/src/mnesia_monitor.erl @@ -674,7 +674,8 @@ env() -> core_dir, pid_sort_order, no_table_loaders, - dc_dump_limit + dc_dump_limit, + send_compressed ]. default_env(access_module) -> @@ -717,7 +718,9 @@ default_env(pid_sort_order) -> default_env(no_table_loaders) -> 2; default_env(dc_dump_limit) -> - 4. + 4; +default_env(send_compressed) -> + 0. check_type(Env, Val) -> case catch do_check_type(Env, Val) of @@ -763,7 +766,8 @@ do_check_type(pid_sort_order, standard) -> standard; do_check_type(pid_sort_order, "standard") -> standard; do_check_type(pid_sort_order, _) -> false; do_check_type(no_table_loaders, N) when is_integer(N), N > 0 -> N; -do_check_type(dc_dump_limit,N) when is_number(N), N > 0 -> N. +do_check_type(dc_dump_limit,N) when is_number(N), N > 0 -> N; +do_check_type(send_compressed, L) when is_integer(L), L >= 0, L =< 9 -> L. bool(true) -> true; bool(false) -> false. |