Optimize 1st-time pull by skipping deleted docs

Send "?active_only=true" as a _changes feed parameter when there's no "since" parameter, to tell SG 1.2+ to skip sending deleted (or removed) docs. This can speed up the initial pull quite a lot. Fixes #1052 (see also couchbase/sync_gateway#1503 )
couchbase · Jan 23, 2016 · eef3f86 · eef3f86
1 parent 9928d54
commit eef3f86
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/Source/ChangeTracker/CBLChangeTracker.m b/Source/ChangeTracker/CBLChangeTracker.m
@@ -107,6 +107,9 @@ - (NSString*) changesFeedPath {
         if ([seq isKindOfClass: [NSArray class]] || [seq isKindOfClass: [NSDictionary class]])
             seq = [CBLJSON stringWithJSONObject: seq options: 0 error: nil];
         [path appendFormat: @"&since=%@", CBLEscapeURLParam([seq description])];
+    } else {
+        // On first replication we can skip getting deleted docs. (SG enhancement in ver. 1.2)
+        [path appendString: @"&active_only=true"];
     }
     if (_limit > 0)
         [path appendFormat: @"&limit=%u", _limit];
@@ -162,6 +165,7 @@ - (NSData*) changesFeedPOSTBody {
     NSMutableDictionary* post = $mdict({@"feed", self.feed},
                                        {@"heartbeat", @(round(_heartbeat*1000.0))},
                                        {@"style", (_includeConflicts ? @"all_docs" : nil)},
+                                       {@"active_only", (since ? nil : @YES)},
                                        {@"since", since},
                                        {@"limit", (_limit > 0 ? @(_limit) : nil)},
                                        {@"filter", filterName},