From a32495d2b4184b7ec7256cb0258bf9bd323e02f2 Mon Sep 17 00:00:00 2001
From: Brian Gough <brian.gough@overleaf.com>
Date: Tue, 1 Oct 2019 14:09:41 +0100
Subject: [PATCH] make background flush more adaptive

---
 .../document-updater/app/coffee/DeleteQueueManager.coffee   | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/services/document-updater/app/coffee/DeleteQueueManager.coffee b/services/document-updater/app/coffee/DeleteQueueManager.coffee
index 3fc6b3f644..731cdf77b7 100644
--- a/services/document-updater/app/coffee/DeleteQueueManager.coffee
+++ b/services/document-updater/app/coffee/DeleteQueueManager.coffee
@@ -64,10 +64,12 @@ module.exports = DeleteQueueManager =
         flushNextProject()
 
     startBackgroundFlush: () ->
+        SHORT_DELAY = 10
+        LONG_DELAY = 1000
         doFlush = () ->
             if Settings.shuttingDown
                 logger.warn "discontinuing background flush due to shutdown"
                 return
-            DeleteQueueManager.flushAndDeleteOldProjects {timeout:1000,min_delete_age:3*60*1000,limit:1000}, () ->
-                setTimeout doFlush, 10
+            DeleteQueueManager.flushAndDeleteOldProjects {timeout:1000,min_delete_age:3*60*1000,limit:1000}, (err, flushed) ->
+                setTimeout doFlush, (if flushed > 10 then SHORT_DELAY else LONG_DELAY)
         doFlush()