From 59087d148ac186930c4a51917e361c599e7314c1 Mon Sep 17 00:00:00 2001
From: Simon Willnauer <simonw@apache.org>
Date: Mon, 4 Jun 2018 17:28:32 +0200
Subject: [PATCH] [TEST] Ensure MDW.assertNoUnreferencedFilesOnClose is
 threadsafe

---
 .../src/java/org/apache/lucene/store/MockDirectoryWrapper.java  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lucene/test-framework/src/java/org/apache/lucene/store/MockDirectoryWrapper.java b/lucene/test-framework/src/java/org/apache/lucene/store/MockDirectoryWrapper.java
index 60f671c25fc..019417771ed 100644
--- a/lucene/test-framework/src/java/org/apache/lucene/store/MockDirectoryWrapper.java
+++ b/lucene/test-framework/src/java/org/apache/lucene/store/MockDirectoryWrapper.java
@@ -804,7 +804,7 @@ public class MockDirectoryWrapper extends BaseDirectoryWrapper {
   }
 
   // NOTE: This is off by default; see LUCENE-5574
-  private boolean assertNoUnreferencedFilesOnClose;
+  private volatile boolean assertNoUnreferencedFilesOnClose;
 
   public void setAssertNoUnrefencedFilesOnClose(boolean v) {
     assertNoUnreferencedFilesOnClose = v;