diff tests/test-bundle.t @ 14164:cb98fed52495

discovery: add new set-based discovery

Adds a new discovery method based on repeatedly sampling the still
undecided subset of the local node graph to determine the set of nodes
common to both the client and the server.

For small differences between client and server, it uses about the same
or slightly fewer roundtrips than the old tree-based discovery. For
larger differences, it typically reduces the number of roundtrips
drastically (from 150 to 4, for instance).

The old discovery code now lives in treediscovery.py, the new code is
in setdiscovery.py.

Still missing is a hook for extensions to contribute nodes to the
initial sample. For instance, Augie's remotebranches could contribute
the last known state of the server's heads.

Credits for the actual sampler and computing common heads instead of
bases go to Benoit Boissinot.

--- a/tests/test-bundle.t	Mon May 02 19:21:30 2011 +0200
+++ b/tests/test-bundle.t	Mon May 02 19:21:30 2011 +0200
@@ -561,7 +561,9 @@
 == bundling
 
   $ hg bundle bundle.hg part --debug
+  query 1; heads
   searching for changes
+  all remote heads known locally
   2 changesets found
   list of changesets:
   d2ae7f538514cd87c17547b0de4cea71fe1af9fb