HDFS-16625. Check assumption about PMDK availability (#4414)

Signed-off-by: Ashutosh Gupta <ashutosh.gupta@st.niituniversity.in>
Signed-off-by: stack <stack@apache.org>

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

@@ -66,6 +66,7 @@ import java.util.function.Supplier;
 import org.apache.hadoop.thirdparty.com.google.common.primitives.Ints;
 
 import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_DATANODE_FSDATASETCACHE_MAX_THREADS_PER_VOLUME_KEY;
+import static org.junit.Assume.assumeTrue;
 
 /**
  * Tests HDFS persistent memory cache by PmemMappableBlockLoader.
@@ -104,6 +105,8 @@ public class TestCacheByPmemMappableBlockLoader {
 
   @BeforeClass
   public static void setUpClass() throws Exception {
+    assumeTrue("Requires PMDK", NativeIO.POSIX.isPmdkAvailable());
+
     oldInjector = DataNodeFaultInjector.get();
     DataNodeFaultInjector.set(new DataNodeFaultInjector() {
       @Override

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

@@ -27,6 +27,7 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
+import static org.junit.Assume.assumeTrue;
 
 import java.io.File;
 import java.io.IOException;
@@ -103,6 +104,8 @@ public class TestPmemCacheRecovery {
 
   @BeforeClass
   public static void setUpClass() throws Exception {
+    assumeTrue("Requires PMDK", NativeIO.POSIX.isPmdkAvailable());
+
     oldInjector = DataNodeFaultInjector.get();
     DataNodeFaultInjector.set(new DataNodeFaultInjector() {
       @Override