HDFS-11671. TestReconstructStripedBlocks#test2RecoveryTasksForSameBlockGroup fails.

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/DFSTestUtil.java

@@ -1872,7 +1872,11 @@ public class DFSTestUtil {
    */
   public static void setDatanodeDead(DatanodeInfo dn) {
     dn.setLastUpdate(0);
-    dn.setLastUpdateMonotonic(0);
+    // Set this to a large negative value.
+    // On short-lived VMs, the monotonic time can be less than the heartbeat
+    // expiry time. Setting this to 0 will fail to immediately mark the DN as
+    // dead.
+    dn.setLastUpdateMonotonic(Long.MIN_VALUE/2);
   }
 
   /**

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestReconstructStripedBlocks.java

@@ -211,12 +211,14 @@ public class TestReconstructStripedBlocks {
       Path p = new Path("/test2RecoveryTasksForSameBlockGroup");
       final byte[] data = new byte[fileLen];
       DFSTestUtil.writeFile(fs, p, data);
+      DFSTestUtil.waitForReplication(fs, p, groupSize, 5000);
 
       LocatedStripedBlock lb = (LocatedStripedBlock)fs.getClient()
           .getLocatedBlocks(p.toString(), 0).get(0);
       LocatedBlock[] lbs = StripedBlockUtil.parseStripedBlockGroup(lb,
           cellSize, dataBlocks, parityBlocks);
 
+      BlockManagerTestUtil.getComputedDatanodeWork(bm);
       assertEquals(0, getNumberOfBlocksToBeErasureCoded(cluster));
       assertEquals(0, bm.getPendingReconstructionBlocksCount());