[tor-commits] [tor/master] Update fallback stability requirements

[nickm@xxxxxxxxxxxxxx]

commit cd687a0a2c430efac0bf98dcc837c3809a63c52b
Author: teor <teor2345@xxxxxxxxx>
Date:   Tue May 16 18:06:05 2017 +1000

    Update fallback stability requirements
    
    Decrease the minimum number of fallbacks to 100.
    
    Final fix to 20913.
---
 changes/bug20913                    | 6 ++++--
 scripts/maint/updateFallbackDirs.py | 2 +-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/changes/bug20913 b/changes/bug20913
index 69bec5b..5086edc 100644
--- a/changes/bug20913
+++ b/changes/bug20913
@@ -1,7 +1,9 @@
   o Minor bugfixes (fallbacks):
     - Make sure fallback directory mirrors have the same address, port, and
       relay identity key for at least 30 days before they are selected.
-      Partial fix to 20913, bugfix on 0.2.8.1-alpha.
+      Fixes 20913, bugfix on 0.2.8.1-alpha.
     - Decrease the guard flag average required to be a fallback. This allows
       us to keep relays that have their guard flag removed when they restart.
-      Partial fix to 20913, bugfix on 0.2.8.1-alpha.
+      Fixes 20913, bugfix on 0.2.8.1-alpha.
+    - Decrease the minimum number of fallbacks to 100.
+      Fixes 20913, bugfix on 0.2.8.1-alpha.
diff --git a/scripts/maint/updateFallbackDirs.py b/scripts/maint/updateFallbackDirs.py
index e116659..82a6042 100755
--- a/scripts/maint/updateFallbackDirs.py
+++ b/scripts/maint/updateFallbackDirs.py
@@ -198,7 +198,7 @@ FALLBACK_PROPORTION_OF_GUARDS = None if OUTPUT_CANDIDATES else _FB_POG
 # Limit the number of fallbacks (eliminating lowest by advertised bandwidth)
 MAX_FALLBACK_COUNT = None if OUTPUT_CANDIDATES else 200
 # Emit a C #error if the number of fallbacks is less than expected
-MIN_FALLBACK_COUNT = 0 if OUTPUT_CANDIDATES else MAX_FALLBACK_COUNT*0.75
+MIN_FALLBACK_COUNT = 0 if OUTPUT_CANDIDATES else MAX_FALLBACK_COUNT*0.5
 
 # The maximum number of fallbacks on the same address, contact, or family
 # With 200 fallbacks, this means each operator can see 1% of client bootstraps



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