--- a/hgext/largefiles/overrides.py	Mon Jul 07 18:45:46 2014 +0900
+++ b/hgext/largefiles/overrides.py	Mon Jul 07 18:45:46 2014 +0900
@@ -992,20 +992,28 @@
 
     return result
 
-def _getoutgoings(repo, missing, addfunc):
+def _getoutgoings(repo, other, missing, addfunc):
     """get pairs of filename and largefile hash in outgoing revisions
     in 'missing'.
 
+    largefiles already existing on 'other' repository are ignored.
+
     'addfunc' is invoked with each unique pairs of filename and
     largefile hash value.
     """
     knowns = set()
+    lfhashes = set()
     def dedup(fn, lfhash):
         k = (fn, lfhash)
         if k not in knowns:
             knowns.add(k)
-            addfunc(fn, lfhash)
+            lfhashes.add(lfhash)
     lfutil.getlfilestoupload(repo, missing, dedup)
+    if lfhashes:
+        lfexists = basestore._openstore(repo, other).exists(lfhashes)
+        for fn, lfhash in knowns:
+            if not lfexists[lfhash]: # lfhash doesn't exist on "other"
+                addfunc(fn, lfhash)
 
 def outgoinghook(ui, repo, other, opts, missing):
     if opts.pop('large', None):
@@ -1027,7 +1035,7 @@
                 lfhashes.add(lfhash)
             def showhashes(fn):
                 pass
-        _getoutgoings(repo, missing, addfunc)
+        _getoutgoings(repo, other, missing, addfunc)
 
         if not toupload:
             ui.status(_('largefiles: no files to upload\n'))
@@ -1058,7 +1066,7 @@
         def addfunc(fn, lfhash):
             toupload.add(fn)
             lfhashes.add(lfhash)
-        _getoutgoings(repo, outgoing.missing, addfunc)
+        _getoutgoings(repo, peer, outgoing.missing, addfunc)
 
         if not toupload:
             # i18n: column positioning for "hg summary"

--- a/tests/test-largefiles-misc.t	Mon Jul 07 18:45:46 2014 +0900
+++ b/tests/test-largefiles-misc.t	Mon Jul 07 18:45:46 2014 +0900
@@ -589,6 +589,46 @@
       89e6c98d92887913cadf06b2adb97f26cde4849b
   
 
+Pusing revision #1 causes uploading entity 89e6c98d9288, which is
+shared also by largefiles b1, b2 in revision #2 and b in revision #5.
+
+Then, entity 89e6c98d9288 is not treated as "outgoing entity" at "hg
+summary" and "hg outgoing", even though files in outgoing revision #2
+and #5 refer it.
+
+  $ hg -R clone2 push -r 1 -q
+  $ hg -R clone2 summary --large
+  parent: 5:036794ea641c tip
+   #5: refer existing largefile entity again
+  branch: default
+  commit: (clean)
+  update: (current)
+  largefiles: 2 entities for 1 files to upload
+  $ hg -R clone2 outgoing --large -T "{rev}:{node|short}\n"
+  comparing with $TESTTMP/issue3651/src (glob)
+  searching for changes
+  2:6095d0695d70
+  3:7983dce246cc
+  4:233f12ada4ae
+  5:036794ea641c
+  largefiles to upload (2 entities):
+  b
+  
+  $ hg -R clone2 outgoing --large -T "{rev}:{node|short}\n" --debug
+  comparing with $TESTTMP/issue3651/src (glob)
+  query 1; heads
+  searching for changes
+  all remote heads known locally
+  2:6095d0695d70
+  3:7983dce246cc
+  4:233f12ada4ae
+  5:036794ea641c
+  largefiles to upload (2 entities):
+  b
+      13f9ed0898e315bf59dc2973fec52037b6f441a2
+      c801c9cfe94400963fcb683246217d5db77f9a9a
+  
+
   $ cd ..
 
 merge action 'd' for 'local renamed directory to d2/g' which has no filename

--- a/tests/test-largefiles.t	Mon Jul 07 18:45:46 2014 +0900
+++ b/tests/test-largefiles.t	Mon Jul 07 18:45:46 2014 +0900
@@ -680,9 +680,7 @@
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     this used to not notice the rm
   
-  largefiles to upload (2 entities):
-  foo
-  large
+  largefiles to upload (1 entities):
   large8
   
   $ cd ../a