From c47cfed0ec0568a4c758ad801d5e11f32b9e05db Mon Sep 17 00:00:00 2001
From: kaijianding <kaijian.ding@gmail.com>
Date: Thu, 27 Apr 2017 20:11:07 +0800
Subject: [PATCH] Significantly improve LongEncodingStrategy.AUTO build
 performance (#4215)

* Significantly improve LongEncodingStrategy.AUTO build performance

* use numInserted instead of tempIn.available

* fix bug
---
 .../segment/data/IntermediateLongSupplierSerializer.java      | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/processing/src/main/java/io/druid/segment/data/IntermediateLongSupplierSerializer.java b/processing/src/main/java/io/druid/segment/data/IntermediateLongSupplierSerializer.java
index 3cf761b2b6b..6b459f48916 100644
--- a/processing/src/main/java/io/druid/segment/data/IntermediateLongSupplierSerializer.java
+++ b/processing/src/main/java/io/druid/segment/data/IntermediateLongSupplierSerializer.java
@@ -131,8 +131,10 @@ public class IntermediateLongSupplierSerializer implements LongSupplierSerialize
 
     try (DataInputStream tempIn = new DataInputStream(new BufferedInputStream(ioPeon.makeInputStream(tempFile)))) {
       delegate.open();
-      while (tempIn.available() > 0) {
+      int available = numInserted;
+      while (available > 0) {
         delegate.add(tempIn.readLong());
+        available--;
       }
     }
   }