From afb28aa7d6f0fd423512b30c1280e59c0f927037 Mon Sep 17 00:00:00 2001
From: martinsumner <martin.sumner@adaptip.co.uk>
Date: Thu, 29 Dec 2016 10:21:57 +0000
Subject: [PATCH] Switch iterator scan width to macro

And 4 seems a more reasonable number than 1
---
 src/leveled_penciller.erl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/leveled_penciller.erl b/src/leveled_penciller.erl
index 031b0d2..b99b3bd 100644
--- a/src/leveled_penciller.erl
+++ b/src/leveled_penciller.erl
@@ -203,6 +203,7 @@
 -define(WORKQUEUE_BACKLOG_TOLERANCE, 4).
 -define(COIN_SIDECOUNT, 5).
 -define(SLOW_FETCH, 20000).
+-define(ITERATOR_SCANWIDTH, 4).
 
 -record(state, {manifest = [] :: list(),
 				manifest_sqn = 0 :: integer(),
@@ -962,7 +963,7 @@ find_nextkey(QueryArray, StartKey, EndKey) ->
                     {null, null},
                     StartKey,
                     EndKey,
-                    1).
+                    ?ITERATOR_SCANWIDTH).
 
 find_nextkey(_QueryArray, LCnt, {null, null}, _StartKey, _EndKey, _Width)
                                             when LCnt > ?MAX_LEVELS ->