exponential backoff

Author: stephenplusplus

lib/storage/file.js

@@ -303,7 +303,7 @@ File.prototype.createWriteStream = function(metadata) {
 
   var numBytesWritten;
   var resumableUri;
-  var RETRY_LIMIT = 3;
+  var RETRY_LIMIT = 5;
   var retries = 0;
 
   // This is used to hold all data coming in from the user's readable stream. If
@@ -510,13 +510,17 @@ File.prototype.createWriteStream = function(metadata) {
       return;
     }
 
-    if (err.code > 499 && err.code < 600 && retries <= RETRY_LIMIT) {
+    if (err.code > 499 && err.code < 600 && retries < RETRY_LIMIT) {
+      // Exponential backoff: http://goo.gl/CifIFy
+      var randomMs = Math.round(Math.random() * 1000);
+      var waitTime = Math.pow(2, retries) * 1000 + randomMs;
+
       retries++;
 
       // Reset `numBytesWritten` so we update this value by pinging the API.
       numBytesWritten = null;
 
-      resumeUpload();
+      setTimeout(resumeUpload, waitTime);
       return;
     }