HDFS-9073. Fix failures in TestLazyPersistLockedMemory testReleaseOnEviction(). (J.Andreina via stevel)

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -1355,6 +1355,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-9072. Fix random failures in TestJMXGet.
     (J.Andreina via stevel)
 
+    HDFS-9073. Fix failures in TestLazyPersistLockedMemory
+    testReleaseOnEviction(). (J.Andreina via stevel)
+
 Release 2.7.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/LazyPersistTestCase.java

@@ -480,6 +480,7 @@ public abstract class LazyPersistTestCase {
 
   protected final void verifyRamDiskJMXMetric(String metricName,
       long expectedValue) throws Exception {
+    waitForMetric(metricName, (int)expectedValue);
     assertEquals(expectedValue, Integer.parseInt(jmx.getValue(metricName)));
   }