HDFS-3716. Purger should remove stale fsimage ckpt files (Contributed by J.Andreina)

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

@@ -843,6 +843,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-8470. fsimage loading progress should update inode, delegation token and
     cache pool count. (surendra singh lilhore via vinayakumarb)
 
+    HDFS-3716. Purger should remove stale fsimage ckpt files
+    (J.Andreina via vinayakumarb)
+
 Release 2.7.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSImage.java

@@ -1209,6 +1209,7 @@ public class FSImage implements Closeable {
       // Since we now have a new checkpoint, we can clean up some
       // old edit logs and checkpoints.
       purgeOldStorage(nnf);
+      archivalManager.purgeCheckpoints(NameNodeFile.IMAGE_NEW);
     } finally {
       // Notify any threads waiting on the checkpoint to be canceled
       // that it is complete.

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

@@ -18,6 +18,7 @@
 package org.apache.hadoop.hdfs.server.namenode;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
 import java.io.File;
@@ -43,6 +44,7 @@ import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.BlockUCState;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.StartupOption;
 import org.apache.hadoop.hdfs.server.namenode.LeaseManager.Lease;
+import org.apache.hadoop.hdfs.server.namenode.NNStorage.NameNodeDirType;
 import org.apache.hadoop.hdfs.util.MD5FileUtils;
 import org.apache.hadoop.test.GenericTestUtils;
 import org.apache.hadoop.test.PathUtils;
@@ -118,6 +120,45 @@ public class TestFSImage {
     }
   }
 
+   /**
+   * On checkpointing , stale fsimage checkpoint file should be deleted.
+   */
+  @Test
+  public void testRemovalStaleFsimageCkpt() throws IOException {
+    MiniDFSCluster cluster = null;
+    SecondaryNameNode secondary = null;
+    Configuration conf = new HdfsConfiguration();
+    try {
+      cluster = new MiniDFSCluster.Builder(conf).
+          numDataNodes(1).format(true).build();
+      conf.set(DFSConfigKeys.DFS_NAMENODE_SECONDARY_HTTP_ADDRESS_KEY,
+          "0.0.0.0:0");
+      secondary = new SecondaryNameNode(conf);
+      // Do checkpointing
+      secondary.doCheckpoint();
+      NNStorage storage = secondary.getFSImage().storage;
+      File currentDir = FSImageTestUtil.
+          getCurrentDirs(storage, NameNodeDirType.IMAGE).get(0);
+      // Create a stale fsimage.ckpt file
+      File staleCkptFile = new File(currentDir.getPath() +
+          "/fsimage.ckpt_0000000000000000002");
+      staleCkptFile.createNewFile();
+      assertTrue(staleCkptFile.exists());
+      // After checkpoint stale fsimage.ckpt file should be deleted
+      secondary.doCheckpoint();
+      assertFalse(staleCkptFile.exists());
+    } finally {
+      if (secondary != null) {
+        secondary.shutdown();
+        secondary = null;
+      }
+      if (cluster != null) {
+        cluster.shutdown();
+        cluster = null;
+      }
+    }
+  }
+
   /**
    * Ensure that the digest written by the saver equals to the digest of the
    * file.