HBASE-27547 Close store file readers after region warmup

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java

@@ -7756,8 +7756,8 @@ public static HRegion openReadOnlyFileSystemHRegion(final Configuration conf, fi
     return r.openHRegion(null);
   }
 
-  public static void warmupHRegion(final RegionInfo info, final TableDescriptor htd, final WAL wal,
-    final Configuration conf, final RegionServerServices rsServices,
+  public static HRegion warmupHRegion(final RegionInfo info, final TableDescriptor htd,
+    final WAL wal, final Configuration conf, final RegionServerServices rsServices,
     final CancelableProgressable reporter) throws IOException {
 
     Objects.requireNonNull(info, "RegionInfo cannot be null");
@@ -7773,6 +7773,8 @@ public static void warmupHRegion(final RegionInfo info, final TableDescriptor ht
     }
     HRegion r = HRegion.newHRegion(tableDir, wal, fs, conf, info, htd, null);
     r.initializeWarmup(reporter);
+    r.close();
+    return r;
   }
 
   /**

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStore.java

@@ -243,6 +243,8 @@ public Set<Path> get() {
   // SFT implementations.
   private final Supplier<StoreFileWriterCreationTracker> storeFileWriterCreationTrackerFactory;
 
+  private final boolean warmup;
+
   /**
    * Constructor
    * @param family    HColumnDescriptor for this column
@@ -290,6 +292,7 @@ protected HStore(final HRegion region, final ColumnFamilyDescriptor family,
       this.compactionCheckMultiplier = DEFAULT_COMPACTCHECKER_INTERVAL_MULTIPLIER;
     }
 
+    this.warmup = warmup;
     this.storeEngine = createStoreEngine(this, this.conf, region.getCellComparator());
     storeEngine.initialize(warmup);
     // if require writing to tmp dir first, then we just return null, which indicate that we do not
@@ -740,7 +743,7 @@ private ImmutableCollection<HStoreFile> closeWithoutLock() throws IOException {
           public Void call() throws IOException {
             boolean evictOnClose =
               getCacheConfig() != null ? getCacheConfig().shouldEvictOnClose() : true;
-            f.closeStoreFile(evictOnClose);
+            f.closeStoreFile(!warmup && evictOnClose);
             return null;
           }
         });

hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestWarmupRegion.java

@@ -120,7 +120,7 @@ public boolean evaluate() throws IOException {
    */
   @After
   public void tearDown() throws Exception {
-    // Nothing to do.
+    TEST_UTIL.deleteTable(TABLENAME);
   }
 
   protected void runwarmup() throws InterruptedException {
@@ -163,4 +163,16 @@ public void testWarmup() throws Exception {
       serverid = (serverid + 1) % 2;
     }
   }
+
+  @Test
+  public void testWarmupAndClose() throws IOException {
+    HRegionServer rs = TEST_UTIL.getMiniHBaseCluster().getRegionServer(0);
+    HRegion region = TEST_UTIL.getMiniHBaseCluster().getRegions(TABLENAME).get(0);
+    RegionInfo info = region.getRegionInfo();
+
+    TableDescriptor htd = table.getDescriptor();
+    HRegion warmedUpRegion =
+      warmupHRegion(info, htd, rs.getWAL(info), rs.getConfiguration(), rs, null);
+    assertTrue(warmedUpRegion.isClosed());
+  }
 }