From c33177e42809b45d4307cec819b6357b366fe0b5 Mon Sep 17 00:00:00 2001
From: Alan Woodward <romseygeek@apache.org>
Date: Mon, 24 Jun 2019 10:03:43 +0100
Subject: [PATCH] LUCENE-8766: Further checks against race in test

---
 .../src/test/org/apache/lucene/monitor/TestCachePurging.java  | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lucene/monitor/src/test/org/apache/lucene/monitor/TestCachePurging.java b/lucene/monitor/src/test/org/apache/lucene/monitor/TestCachePurging.java
index 3e87071097a..e1409a8cf6e 100644
--- a/lucene/monitor/src/test/org/apache/lucene/monitor/TestCachePurging.java
+++ b/lucene/monitor/src/test/org/apache/lucene/monitor/TestCachePurging.java
@@ -149,7 +149,9 @@ public class TestCachePurging extends MonitorTestBase {
       monitor.addQueryIndexUpdateListener(new MonitorUpdateListener() {
         @Override
         public void onPurge() {
-          latch.countDown();
+          // It can sometimes take a couple of purge runs to get everything in sync
+          if (monitor.getQueryCacheStats().cachedQueries == 99)
+            latch.countDown();
         }
       });