kocolosk commented on a change in pull request #1370: [5/5] Clustered Purge
Implementation
URL: https://github.com/apache/couchdb/pull/1370#discussion_r194942869
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File path: src/mem3/src/mem3_rep.erl
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@@ -169,20 +200,131 @@ find_source_seq_int(#doc{body={Props}}, SrcNode0,
TgtNode0, TgtUUID, TgtSeq) ->
end.
-repl(#acc{db = Db} = Acc0) ->
- erlang:put(io_priority, {internal_repl, couch_db:name(Db)}),
- #acc{seq=Seq} = Acc1 = calculate_start_seq(Acc0),
- case Seq >= couch_db:get_update_seq(Db) of
- true ->
- {ok, 0};
- false ->
- Fun = fun ?MODULE:changes_enumerator/2,
- {ok, Acc2} = couch_db:fold_changes(Db, Seq, Fun, Acc1),
- {ok, #acc{seq = LastSeq}} = replicate_batch(Acc2),
- {ok, couch_db:count_changes_since(Db, LastSeq)}
+repl(#acc{db = Db0} = Acc0) ->
+ erlang:put(io_priority, {internal_repl, couch_db:name(Db0)}),
+ Acc1 = calculate_start_seq(Acc0),
+ try
+ Acc3 = case config:get_boolean("mem3", "replicate_purges", false) of
+ true ->
+ Acc2 = pull_purges(Acc1),
+ push_purges(Acc2);
+ false ->
+ Acc1
+ end,
+ push_changes(Acc3)
+ catch
+ throw:{finished, Count} ->
+ {ok, Count}
end.
+pull_purges(#acc{} = Acc0) ->
+ #acc{
+ batch_size = Count,
+ seq = UpdateSeq,
+ target = Target
+ } = Acc0,
+ #shard{
+ node = TgtNode,
+ name = TgtDbName
+ } = Target,
+
+ with_src_db(Acc0, fun(Db) ->
Review comment:
So now every invocation of `repl/1` loops back through `couch_server` 3
times to open the database? Is that really necessary? I can see where you need
to reopen the DB after executing the purge requests that you pulled from the
target but otherwise I'd expect that the source DB is more easily preserved
across these calls.
Also it's a little weird now that `#acc.db` is set but is the wrong thing to
use.
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