diff --git a/mercurial/changelog.py b/mercurial/changelog.py
--- a/mercurial/changelog.py
+++ b/mercurial/changelog.py
@@ -443,12 +443,13 @@
         self._filteredrevs = val
         self._filteredrevs_hashcache = {}
 
+    def _write_docket(self, tr):
+        if not self._delayed:
+            super(changelog, self)._write_docket(tr)
+
     def delayupdate(self, tr):
         """delay visibility of index updates to other readers"""
-        if self._docket is not None:
-            return
-
-        if not self._delayed:
+        if self._docket is None and not self._delayed:
             if len(self) == 0:
                 self._divert = True
                 if self._realopener.exists(self._indexfile + b'.a'):
@@ -468,7 +469,9 @@
         self._delayed = False
         self.opener = self._realopener
         # move redirected index data back into place
-        if self._divert:
+        if self._docket is not None:
+            self._write_docket(tr)
+        elif self._divert:
             assert not self._delaybuf
             tmpname = self._indexfile + b".a"
             nfile = self.opener.open(tmpname)
diff --git a/mercurial/configitems.py b/mercurial/configitems.py
--- a/mercurial/configitems.py
+++ b/mercurial/configitems.py
@@ -1150,7 +1150,6 @@
 )
 # "out of experimental" todo list.
 #
-# * properly hide uncommitted content to other process
 # * expose transaction content hooks during pre-commit validation
 # * include management of a persistent nodemap in the main docket
 # * enforce a "no-truncate" policy for mmap safety
diff --git a/mercurial/revlog.py b/mercurial/revlog.py
--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -2096,7 +2096,7 @@
                     try:
                         yield
                         if self._docket is not None:
-                            self._docket.write(transaction)
+                            self._write_docket(transaction)
                     finally:
                         self._writinghandles = None
                 finally:
@@ -2105,6 +2105,15 @@
                 if dfh is not None:
                     dfh.close()
 
+    def _write_docket(self, transaction):
+        """write the current docket on disk
+
+        Exist as a method to help changelog to implement transaction logic
+
+        We could also imagine using the same transaction logic for all revlog
+        since docket are cheap."""
+        self._docket.write(transaction)
+
     def addrevision(
         self,
         text,
@@ -3187,18 +3196,6 @@
             # Nothing to generate or remove
             return
 
-        # changelog implement some "delayed" writing mechanism that assume that
-        # all index data is writen in append mode and is therefor incompatible
-        # with the seeked write done in this method. The use of such "delayed"
-        # writing will soon be removed for revlog version that support side
-        # data, so for now, we only keep this simple assert to highlight the
-        # situation.
-        delayed = getattr(self, '_delayed', False)
-        diverted = getattr(self, '_divert', False)
-        if delayed and not diverted:
-            msg = "cannot rewrite_sidedata of a delayed revlog"
-            raise error.ProgrammingError(msg)
-
         new_entries = []
         # append the new sidedata
         with self._writing(transaction):
diff --git a/tests/test-transaction-safety.t b/tests/test-transaction-safety.t
--- a/tests/test-transaction-safety.t
+++ b/tests/test-transaction-safety.t
@@ -46,13 +46,13 @@
   $ cat << EOF > script/external.sh
   > #!/bin/sh
   > $RUNTESTDIR/testlib/wait-on-file 5 $HG_TEST_FILE_EXT_UNLOCK $HG_TEST_FILE_EXT_WAITING
-  > hg log --rev 'tip' -T 'external: {rev} {desc}\n' > $TESTTMP/output/external.out
+  > hg log --rev 'tip' -T 'external: {rev} {desc}\n' > $TESTTMP/output/external.out 2>/dev/null
   > touch $HG_TEST_FILE_EXT_DONE
   > EOF
   $ chmod +x script/external.sh
   $ cat << EOF > script/internal.sh
   > #!/bin/sh
-  > hg log --rev 'tip' -T 'internal: {rev} {desc}\n' > $TESTTMP/output/internal.out
+  > hg log --rev 'tip' -T 'internal: {rev} {desc}\n' > $TESTTMP/output/internal.out 2>/dev/null
   > $RUNTESTDIR/testlib/wait-on-file 5 $HG_TEST_FILE_EXT_DONE $HG_TEST_FILE_EXT_UNLOCK
   > EOF
   $ chmod +x script/internal.sh
@@ -123,9 +123,9 @@
 
   $ make_one_commit first
   pre-commit: -1 
-  external: -1  (revlogv1 !)
-  external: 0 first (revlogv2 known-bad-output !)
-  internal: 0 first
+  external: -1 
+  internal: 0 first (revlogv1 !)
+  internal: -1  (revlogv2 known-bad-output !)
   post-tr:  0 first
 
 #if revlogv1
@@ -149,9 +149,9 @@
 
   $ make_one_commit second
   pre-commit: 0 first
-  external: 0 first (revlogv1 !)
-  external: 1 second (revlogv2 known-bad-output !)
-  internal: 1 second
+  external: 0 first
+  internal: 1 second (revlogv1 !)
+  internal: 0 first (revlogv2 known-bad-output !)
   post-tr:  1 second
 
 #if revlogv1
@@ -176,9 +176,9 @@
   $ make_one_pull 3
   pre-commit: 1 second
   warning: repository is unrelated
-  external: 1 second (revlogv1 !)
-  external: 5 r3 (revlogv2 known-bad-output !)
-  internal: 5 r3
+  external: 1 second
+  internal: 5 r3 (revlogv1 !)
+  internal: 1 second (revlogv2 known-bad-output !)
   post-tr:  5 r3
 
 #if revlogv1
@@ -202,9 +202,9 @@
 
   $ make_one_pull 400
   pre-commit: 5 r3
-  external: 5 r3 (revlogv1 !)
-  external: 402 r400 (revlogv2 known-bad-output !)
-  internal: 402 r400
+  external: 5 r3
+  internal: 402 r400 (revlogv1 !)
+  internal: 5 r3 (revlogv2 known-bad-output !)
   post-tr:  402 r400
 
 #if revlogv1
@@ -228,9 +228,9 @@
 
   $ make_one_commit third
   pre-commit: 402 r400
-  external: 402 r400 (revlogv1 !)
-  external: 403 third (revlogv2 known-bad-output !)
-  internal: 403 third
+  external: 402 r400
+  internal: 403 third (revlogv1 !)
+  internal: 402 r400 (revlogv2 known-bad-output !)
   post-tr:  403 third
 
 #if revlogv1
@@ -255,9 +255,9 @@
 
   $ make_one_pull tip
   pre-commit: 403 third
-  external: 403 third (revlogv1 !)
-  external: 503 r500 (revlogv2 known-bad-output !)
-  internal: 503 r500
+  external: 403 third
+  internal: 503 r500 (revlogv1 !)
+  internal: 403 third (revlogv2 known-bad-output !)
   post-tr:  503 r500
 
 #if revlogv1