From 0e8612512489d4101655950618f7442e9ce66d50 Mon Sep 17 00:00:00 2001
From: Michael McCandless <mikemccand@apache.org>
Date: Mon, 28 Feb 2011 17:38:33 +0000
Subject: [PATCH] LUCENE-2918: fix thread safety bug w/ assert statement

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1075443 13f79535-47bb-0310-9956-ffa450edef68
---
 lucene/src/java/org/apache/lucene/index/IndexWriter.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lucene/src/java/org/apache/lucene/index/IndexWriter.java b/lucene/src/java/org/apache/lucene/index/IndexWriter.java
index 12459f3cd21..3b2d7603ccc 100644
--- a/lucene/src/java/org/apache/lucene/index/IndexWriter.java
+++ b/lucene/src/java/org/apache/lucene/index/IndexWriter.java
@@ -3199,10 +3199,10 @@ public class IndexWriter implements Closeable {
         final SegmentReader clone = (SegmentReader) reader.clone(true);
         merge.readerClones.add(clone);
 
-        if (reader.numDocs() > 0) {
+        if (clone.numDocs() > 0) {
           merger.add(clone);
+          totDocCount += clone.numDocs();
         }
-        totDocCount += clone.numDocs();
         segUpto++;
       }