Remove availability of CQv1

Most of the v1 code is still around as it is needed
for conversion to v2. It will be removed at a later
time when conversion is no longer supported.

We don't shard the CQ property suite anymore:
there's only 1 case remaining.

Author: Loïc Hoguin

deps/rabbit/BUILD.bazel

@@ -322,8 +322,6 @@ rabbitmq_integration_suite(
 rabbitmq_integration_suite(
     name = "classic_queue_prop_SUITE",
     size = "large",
-    shard_count = 6,
-    sharding_method = "case",
     deps = [
         "@proper//:erlang_app",
     ],

deps/rabbit/priv/schema/rabbit.schema

@@ -2504,7 +2504,7 @@ end}.
 
 {translation, "rabbit.classic_queue_default_version",
     fun(Conf) ->
-        case cuttlefish:conf_get("classic_queue.default_version", Conf, 1) of
+        case cuttlefish:conf_get("classic_queue.default_version", Conf, 2) of
             1 -> 1;
             2 -> 2;
             _ -> cuttlefish:unset()

deps/rabbit/src/rabbit_amqqueue_process.erl

@@ -477,12 +477,8 @@ init_queue_mode(Mode, State = #q {backing_queue = BQ,
 
 init_queue_version(Version0, State = #q {backing_queue = BQ,
                                          backing_queue_state = BQS}) ->
-    %% When the version is undefined we use the default version 1.
-    %% We want to BQ:set_queue_version in all cases because a v2
-    %% policy might have been deleted, for example, and we want
-    %% the queue to go back to v1.
     Version = case Version0 of
-        undefined -> rabbit_misc:get_env(rabbit, classic_queue_default_version, 1);
+        undefined -> 2;
         _ -> Version0
     end,
     BQS1 = BQ:set_queue_version(Version, BQS),

deps/rabbit/src/rabbit_classic_queue_index_v2.erl

@@ -1078,7 +1078,7 @@ sync(State0 = #qi{ confirms = Confirms,
     end,
     State#qi{ confirms = sets:new([{version,2}]) }.
 
--spec needs_sync(state()) -> 'false'.
+-spec needs_sync(state()) -> 'false' | 'confirms'.
 
 needs_sync(State = #qi{ confirms = Confirms }) ->
     ?DEBUG("~0p", [State]),

deps/rabbit/src/rabbit_queue_index.erl

@@ -313,7 +313,9 @@ init_for_conversion(#resource{ virtual_host = VHost } = Name, OnSyncFun, OnSyncM
                          'undefined' | non_neg_integer(), qistate()}.
 
 recover(#resource{ virtual_host = VHost } = Name, Terms, MsgStoreRecovered,
-        ContainsCheckFun, OnSyncFun, OnSyncMsgFun, Context) ->
+        ContainsCheckFun, OnSyncFun, OnSyncMsgFun,
+        %% We only allow using this module when converting to v2.
+        convert) ->
     #{segment_entry_count := SegmentEntryCount} = rabbit_vhost:read_config(VHost),
     put(segment_entry_count, SegmentEntryCount),
     VHostDir = rabbit_vhost:msg_store_dir_path(VHost),
@@ -323,10 +325,10 @@ recover(#resource{ virtual_host = VHost } = Name, Terms, MsgStoreRecovered,
     CleanShutdown = Terms /= non_clean_shutdown,
     case CleanShutdown andalso MsgStoreRecovered of
         true  -> case proplists:get_value(segments, Terms, non_clean_shutdown) of
-                     non_clean_shutdown -> init_dirty(false, ContainsCheckFun, State1, Context);
+                     non_clean_shutdown -> init_dirty(false, ContainsCheckFun, State1);
                      RecoveredCounts    -> init_clean(RecoveredCounts, State1)
                  end;
-        false -> init_dirty(CleanShutdown, ContainsCheckFun, State1, Context)
+        false -> init_dirty(CleanShutdown, ContainsCheckFun, State1)
     end.
 
 -spec terminate(rabbit_types:vhost(), [any()], qistate()) -> qistate().
@@ -644,7 +646,7 @@ init_clean(RecoveredCounts, State) ->
 -define(RECOVER_BYTES, 2).
 -define(RECOVER_COUNTER_SIZE, 2).
 
-init_dirty(CleanShutdown, ContainsCheckFun, State, Context) ->
+init_dirty(CleanShutdown, ContainsCheckFun, State) ->
     %% Recover the journal completely. This will also load segments
     %% which have entries in the journal and remove duplicates. The
     %% counts will correctly reflect the combination of the segment
@@ -679,84 +681,7 @@ init_dirty(CleanShutdown, ContainsCheckFun, State, Context) ->
     %% recovery fails with a crash.
     State2 = flush_journal(State1 #qistate { segments = Segments1,
                                              dirty_count = DirtyCount }),
-    case Context of
-        convert ->
-            {Count, Bytes, State2};
-        main ->
-            %% We try to see if there are segment files from the v2 index.
-            case rabbit_file:wildcard(".*\\.qi", Dir) of
-                %% We are recovering a dirty queue that was using the v2 index or in
-                %% the process of converting from v2 to v1.
-                [_|_] ->
-                    #resource{virtual_host = VHost, name = QName} = State2#qistate.queue_name,
-                    rabbit_log:info("Queue ~ts in vhost ~ts recovered ~b total messages before resuming convert",
-                                    [QName, VHost, Count]),
-                    CountersRef = counters:new(?RECOVER_COUNTER_SIZE, []),
-                    State3 = recover_index_v2_dirty(State2, ContainsCheckFun, CountersRef),
-                    {Count + counters:get(CountersRef, ?RECOVER_COUNT),
-                     Bytes + counters:get(CountersRef, ?RECOVER_BYTES),
-                     State3};
-                %% Otherwise keep default values.
-                [] ->
-                    {Count, Bytes, State2}
-            end
-    end.
-
-recover_index_v2_dirty(State0 = #qistate { queue_name = Name,
-                                           on_sync = OnSyncFun,
-                                           on_sync_msg = OnSyncMsgFun },
-                       ContainsCheckFun, CountersRef) ->
-    #resource{virtual_host = VHost, name = QName} = Name,
-    rabbit_log:info("Converting queue ~ts in vhost ~ts from v2 to v1 after unclean shutdown", [QName, VHost]),
-    %% We cannot use the counts/bytes because some messages may be in both
-    %% the v1 and v2 indexes after a crash.
-    {_, _, V2State} = rabbit_classic_queue_index_v2:recover(Name, non_clean_shutdown, true,
-                                                            ContainsCheckFun, OnSyncFun, OnSyncMsgFun,
-                                                            convert),
-    State = recover_index_v2_common(State0, V2State, CountersRef),
-    rabbit_log:info("Queue ~ts in vhost ~ts converted ~b total messages from v2 to v1",
-                    [QName, VHost, counters:get(CountersRef, ?RECOVER_COUNT)]),
-    State.
-
-%% At this point all messages are persistent because transient messages
-%% were dropped during the v2 index recovery.
-recover_index_v2_common(State0 = #qistate { queue_name = Name, dir = Dir },
-                        V2State, CountersRef) ->
-    %% Use a temporary per-queue store state to read embedded messages.
-    StoreState0 = rabbit_classic_queue_store_v2:init(Name),
-    %% Go through the v2 index and publish messages to v1 index.
-    {LoSeqId, HiSeqId, _} = rabbit_classic_queue_index_v2:bounds(V2State),
-    %% When resuming after a crash we need to double check the messages that are both
-    %% in the v1 and v2 index (effectively the messages below the upper bound of the
-    %% v1 index that are about to be written to it).
-    {_, V1HiSeqId, _} = bounds(State0),
-    SkipFun = fun
-        (SeqId, FunState0) when SeqId < V1HiSeqId ->
-            case read(SeqId, SeqId + 1, FunState0) of
-                %% Message already exists, skip.
-                {[_], FunState} ->
-                    {skip, FunState};
-                %% Message doesn't exist, write.
-                {[], FunState} ->
-                    {write, FunState}
-            end;
-        %% Message is out of bounds of the v1 index.
-        (_, FunState) ->
-            {write, FunState}
-    end,
-    %% We use a common function also used with conversion on policy change.
-    {State1, _StoreState} = rabbit_variable_queue:convert_from_v2_to_v1_loop(Name, State0, V2State, StoreState0,
-                                                                            {CountersRef, ?RECOVER_COUNT, ?RECOVER_BYTES},
-                                                                            LoSeqId, HiSeqId, SkipFun),
-    %% Delete any remaining v2 index files.
-    OldFiles = rabbit_file:wildcard(".*\\.qi", Dir)
-            ++ rabbit_file:wildcard(".*\\.qs", Dir),
-    _ = [rabbit_file:delete(filename:join(Dir, F)) || F <- OldFiles],
-    %% Ensure that everything in the v1 index is written to disk.
-    State = flush(State1),
-    %% Clean up all the garbage that we have surely been creating.
-    garbage_collect(),
-    State.
+    {Count, Bytes, State2}.
 
 terminate(State = #qistate { journal_handle = JournalHdl,
                              segments = Segments }) ->