Bugfix for rare race between just-finished repair and flapping ending
Fix for today: We are going to game the system. We know that
C100 is going to be checking authorship relative to P_current's
UPI's tail. Therefore, we're just going to set it here.
Why??? Because we have been using this projection safely for
the entire flapping period! ... The only other way I see is to
allow C100 to carve out an exception if the repair finished
PLUS author_server check fails PLUS if we came from here, but
that feels a bit fragile to me: if some code factoring happens
in projection_transition_is_saneprojection_transition_is_sane()
or elsewhere that causes the author_server check to be
something-other-than-the-final-thing-checked, then such a
refactoring would likely cause an even harder bug to find &
fix. Conditions tested: 5 FLUs plus alternating partitions of:
[
[{a,b}], [], [{a,b}], [], [{a,b}], [], [{a,b}], [], [{a,b}], [],
[{b,a},{d,e}],
[{a,b}], [], [{a,b}], [], [{a,b}], [], [{a,b}], [], [{a,b}], []
].
This commit is contained in:
Scott Lystig Fritchie
parent
54b5014446
commit
96ca7b7082
1 changed files with 49 additions and 31 deletions
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@ -966,7 +966,9 @@ react_to_env_A30(Retries, P_latest, LatestUnanimousP, _ReadExtra,
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?REACT({a30, ?LINE, DbgX}),
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{P_newprop3#projection_v1{dbg=DbgX,
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inner=P_inner2}, S_i};
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_ ->
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{_, P_newprop3_flap_count} ->
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?REACT({a30, ?LINE,[{newprop3_flap_count,P_newprop3_flap_count},
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{flap_limit, FlapLimit}]}),
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{P_newprop3, S3}
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end,
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@ -1019,6 +1021,8 @@ react_to_env_A30(Retries, P_latest, LatestUnanimousP, _ReadExtra,
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if MoveFromInnerToNorm_p orelse Kicker_p ->
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ClauseInfo = [{inner_kicker, Kicker_p},
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{inner_kicker2, {Latest_authors_flap_count_current,
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Latest_authors_flap_count_latest}},
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{move_from_inner, MoveFromInnerToNorm_p}],
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?REACT({a30, ?LINE, ClauseInfo}),
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%% %% 2015-04-14: YEAH, this appears to work!
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@ -1075,13 +1079,24 @@ react_to_env_A30(Retries, P_latest, LatestUnanimousP, _ReadExtra,
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%% transition safety check, and so all 5 spin in an infinite loop,
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%% cool!
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%%
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%% Fix for today: Send a signal (through a new func arg) to C100
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%% that we're moving from inner to outer. If the
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%% 'expected_author2' error is the only sanity check that fails at
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%% C100, then that's OK, because: 1. We've lost track of the
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%% author, so we can't satisfy the check 100% of the time. (We
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%% have the option of picking the
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%% Fix for today: We are going to game the system. We know that
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%% C100 is going to be checking authorship relative to P_current's
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%% UPI's tail. Therefore, we're just going to set it here.
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%% Why??? Because we have been using this projection safely for
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%% the entire flapping period! ... The only other way I see is to
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%% allow C100 to carve out an exception if the repair finished
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%% PLUS author_server check fails PLUS if we came from here, but
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%% that feels a bit fragile to me: if some code factoring happens
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%% in projection_transition_is_saneprojection_transition_is_sane()
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%% or elsewhere that causes the author_server check to be
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%% something-other-than-the-final-thing-checked, then such a
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%% refactoring would likely cause an even harder bug to find &
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%% fix. Conditions tested: 5 FLUs plus alternating partitions of:
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%% [
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%% [{a,b}], [], [{a,b}], [], [{a,b}], [], [{a,b}], [], [{a,b}], [],
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%% [{b,a},{d,e}],
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%% [{a,b}], [], [{a,b}], [], [{a,b}], [], [{a,b}], [], [{a,b}], []
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%% ].
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%%
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%% TODO: Perhaps that quickest author should consult all of the
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%% other private stores, check their inner, and if there is a
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@ -1092,18 +1107,26 @@ react_to_env_A30(Retries, P_latest, LatestUnanimousP, _ReadExtra,
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P_inner2A = inner_projection_or_self(P_current),
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ResetEpoch = P_newprop10#projection_v1.epoch_number,
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ResetAuthor = P_current#projection_v1.author_server,
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ClauseInfo2 = [{old_author, P_inner2A#projection_v1.author_server},
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ResetAuthor = case P_current#projection_v1.upi of
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[] ->
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%% Drat, fall back to current's author.
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P_current#projection_v1.author_server;
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_ ->
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lists:last(P_current#projection_v1.upi)
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end,
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ClauseInfo2 = [{move_from_inner_to_outer, true},
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{old_author, P_inner2A#projection_v1.author_server},
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{reset_author, ResetAuthor},
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{reset_epoch, ResetEpoch}],
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P_inner2B =
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machi_projection:update_checksum(
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P_inner2A#projection_v1{epoch_number=ResetEpoch,
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author_server=ResetAuthor,
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dbg=ClauseInfo++ClauseInfo2},
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dbg=ClauseInfo++ClauseInfo2}),
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ReactI = [{inner2b,machi_projection:make_summary(P_inner2B)}],
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?REACT({a30, ?LINE, ReactI}),
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io:format(user, "HEE30 ~w ~w ~w\n", [S#ch_mgr.name, self(), lists:reverse(get(react))]), timer:sleep(100),
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react_to_env_C100(P_inner2B, P_latest, reset_loop_maybe, S);
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io:format(user, "HEE30 ~w ~w ~P\n", [S#ch_mgr.name, self(), get(react), 250]), timer:sleep(100),
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react_to_env_C100(P_inner2B, P_latest, S);
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true ->
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?REACT({a30, ?LINE, []}),
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react_to_env_A40(Retries, P_newprop10, P_latest,
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@ -1281,7 +1304,7 @@ react_to_env_B10(Retries, P_newprop, P_latest, LatestUnanimousP,
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]}),
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put(b10_hack, false),
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react_to_env_C100(P_newprop, P_latest, undefined, S);
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react_to_env_C100(P_newprop, P_latest, S);
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P_newprop_flap_count >= FlapLimit ->
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%% I am flapping ... what else do I do?
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@ -1374,7 +1397,7 @@ react_to_env_B10(Retries, P_newprop, P_latest, LatestUnanimousP,
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react_to_env_C300(P_newprop, P_latest, S)
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end.
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react_to_env_C100(P_newprop, P_latest, PerhapsReset,
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react_to_env_C100(P_newprop, P_latest,
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#ch_mgr{name=MyName, proj=P_current}=S) ->
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?REACT(c100),
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@ -1395,20 +1418,15 @@ react_to_env_C100(P_newprop, P_latest, PerhapsReset,
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erase(perhaps_reset_loop),
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react_to_env_C110(P_latest, S);
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_AnyOtherReturnValue ->
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io:format(user, "RESETLOOP: ~p ~w ~P", [MyName, get(perhaps_reset_loop), get(react), 70]),
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if PerhapsReset == reset_loop_maybe ->
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case get(perhaps_reset_loop) of
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undefined ->
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put(perhaps_reset_loop, 1);
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X when X > 10 ->
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X when X > 15 ->
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Msg = lists:flatten(
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io_lib:format("~P", [get(react), 200])),
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io_lib:format("~P", [get(react), 300])),
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exit({not_supposed_to_happen, ?MODULE, ?LINE, Msg});
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X ->
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put(perhaps_reset_loop, X+1)
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end;
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PerhapsReset == undefined ->
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ok
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end,
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%% P_latest is not sane.
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%% By process of elimination, P_newprop is best,
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