Experiment with new cache size algorithm

Remove the jitter probability and make it a smooth function heading
towards the max ache size

src/leveled_bookie.erl

@@ -162,7 +162,6 @@
 -define(SHUTDOWN_WAITS, 60).
 -define(SHUTDOWN_PAUSE, 10000).
 -define(SNAPSHOT_TIMEOUT, 300000).
--define(JITTER_PROB, 0.01).
 -define(CHECKJOURNAL_PROB, 0.2).
 
 -record(state, {inker :: pid(),
@@ -780,13 +779,15 @@ maybepush_ledgercache(MaxCacheSize, Cache, Penciller) ->
 
 
 maybe_withjitter(CacheSize, MaxCacheSize) ->
+    
     if
         CacheSize > 2 * MaxCacheSize ->
             true;
         CacheSize > MaxCacheSize ->
-            R = random:uniform(),
+            T = 2 * MaxCacheSize - CacheSize,
+            R = random:uniform(CacheSize),
             if
-                R < ?JITTER_PROB ->
+                R > T ->
                     true;
                 true ->
                     false
@@ -795,6 +796,8 @@ maybe_withjitter(CacheSize, MaxCacheSize) ->
             false
     end.
 
+
+
 load_fun(KeyInLedger, ValueInLedger, _Position, Acc0, ExtractFun) ->
     {MinSQN, MaxSQN, OutputTree} = Acc0,
     {SQN, Type, PK} = KeyInLedger,

test/end_to_end/iterator_SUITE.erl

@@ -7,12 +7,12 @@
 
 -export([all/0]).
 -export([simple_load_with2i/1,
-            simple_querycount/1,
+            query_count/1,
             rotating_objects/1]).
 
 all() -> [
             simple_load_with2i,
-            simple_querycount,
+            query_count,
             rotating_objects].
 
 
@@ -41,9 +41,9 @@ simple_load_with2i(_Config) ->
     testutil:reset_filestructure().
 
 
-simple_querycount(_Config) ->
+query_count(_Config) ->
     RootPath = testutil:reset_filestructure(),
-    {ok, Book1} = leveled_bookie:book_start(RootPath, 2500, 50000000),
+    {ok, Book1} = leveled_bookie:book_start(RootPath, 2000, 50000000),
     {TestObject, TestSpec} = testutil:generate_testobject("Bucket",
                                                             "Key1",
                                                             "Value1",