HDFS-7560. ACLs removed by removeDefaultAcl() will be back after NameNode restart/failover. Contributed by Vinayakumar B.

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

@@ -627,6 +627,9 @@ Release 2.7.0 - UNRELEASED
     HDFS-7557. Fix spacing for a few keys in DFSConfigKeys.java 
     (Colin P.McCabe)
 
+    HDFS-7560. ACLs removed by removeDefaultAcl() will be back after NameNode
+    restart/failover. (Vinayakumar B via cnauroth)
+
 Release 2.6.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES

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

@@ -143,7 +143,7 @@ class FSDirAclOp {
     try {
       iip = fsd.getINodesInPath4Write(src);
       fsd.checkOwner(pc, iip);
-      List<AclEntry> newAcl = unprotectedSetAcl(fsd, src, aclSpec);
+      List<AclEntry> newAcl = unprotectedSetAcl(fsd, src, aclSpec, false);
       fsd.getEditLog().logSetAcl(src, newAcl);
     } finally {
       fsd.writeUnlock();
@@ -185,7 +185,7 @@ class FSDirAclOp {
   }
 
   static List<AclEntry> unprotectedSetAcl(
-      FSDirectory fsd, String src, List<AclEntry> aclSpec)
+      FSDirectory fsd, String src, List<AclEntry> aclSpec, boolean fromEdits)
       throws IOException {
     assert fsd.hasWriteLock();
     final INodesInPath iip = fsd.getINodesInPath4Write(
@@ -199,9 +199,11 @@ class FSDirAclOp {
 
     INode inode = FSDirectory.resolveLastINode(iip);
     int snapshotId = iip.getLatestSnapshotId();
-    List<AclEntry> existingAcl = AclStorage.readINodeLogicalAcl(inode);
-    List<AclEntry> newAcl = AclTransformation.replaceAclEntries(existingAcl,
-      aclSpec);
+    List<AclEntry> newAcl = aclSpec;
+    if (!fromEdits) {
+      List<AclEntry> existingAcl = AclStorage.readINodeLogicalAcl(inode);
+      newAcl = AclTransformation.replaceAclEntries(existingAcl, aclSpec);
+    }
     AclStorage.updateINodeAcl(inode, newAcl, snapshotId);
     return newAcl;
   }

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

@@ -823,7 +823,8 @@ public class FSEditLogLoader {
     }
     case OP_SET_ACL: {
       SetAclOp setAclOp = (SetAclOp) op;
-      FSDirAclOp.unprotectedSetAcl(fsDir, setAclOp.src, setAclOp.aclEntries);
+      FSDirAclOp.unprotectedSetAcl(fsDir, setAclOp.src, setAclOp.aclEntries,
+          true);
       break;
     }
     case OP_SET_XATTR: {

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

@@ -426,7 +426,7 @@ public abstract class FSAclBaseTest {
   }
 
   @Test
-  public void testRemoveDefaultAcl() throws IOException {
+  public void testRemoveDefaultAcl() throws Exception {
     FileSystem.mkdirs(fs, path, FsPermission.createImmutable((short)0750));
     List<AclEntry> aclSpec = Lists.newArrayList(
       aclEntry(ACCESS, USER, ALL),
@@ -443,10 +443,15 @@ public abstract class FSAclBaseTest {
       aclEntry(ACCESS, GROUP, READ_EXECUTE) }, returned);
     assertPermission((short)010770);
     assertAclFeature(true);
+    // restart of the cluster
+    restartCluster();
+    s = fs.getAclStatus(path);
+    AclEntry[] afterRestart = s.getEntries().toArray(new AclEntry[0]);
+    assertArrayEquals(returned, afterRestart);
   }
 
   @Test
-  public void testRemoveDefaultAclOnlyAccess() throws IOException {
+  public void testRemoveDefaultAclOnlyAccess() throws Exception {
     fs.create(path).close();
     fs.setPermission(path, FsPermission.createImmutable((short)0640));
     List<AclEntry> aclSpec = Lists.newArrayList(
@@ -463,10 +468,15 @@ public abstract class FSAclBaseTest {
       aclEntry(ACCESS, GROUP, READ_EXECUTE) }, returned);
     assertPermission((short)010770);
     assertAclFeature(true);
+    // restart of the cluster
+    restartCluster();
+    s = fs.getAclStatus(path);
+    AclEntry[] afterRestart = s.getEntries().toArray(new AclEntry[0]);
+    assertArrayEquals(returned, afterRestart);
   }
 
   @Test
-  public void testRemoveDefaultAclOnlyDefault() throws IOException {
+  public void testRemoveDefaultAclOnlyDefault() throws Exception {
     FileSystem.mkdirs(fs, path, FsPermission.createImmutable((short)0750));
     List<AclEntry> aclSpec = Lists.newArrayList(
       aclEntry(DEFAULT, USER, "foo", ALL));
@@ -477,10 +487,15 @@ public abstract class FSAclBaseTest {
     assertArrayEquals(new AclEntry[] { }, returned);
     assertPermission((short)0750);
     assertAclFeature(false);
+    // restart of the cluster
+    restartCluster();
+    s = fs.getAclStatus(path);
+    AclEntry[] afterRestart = s.getEntries().toArray(new AclEntry[0]);
+    assertArrayEquals(returned, afterRestart);
   }
 
   @Test
-  public void testRemoveDefaultAclMinimal() throws IOException {
+  public void testRemoveDefaultAclMinimal() throws Exception {
     FileSystem.mkdirs(fs, path, FsPermission.createImmutable((short)0750));
     fs.removeDefaultAcl(path);
     AclStatus s = fs.getAclStatus(path);
@@ -488,10 +503,15 @@ public abstract class FSAclBaseTest {
     assertArrayEquals(new AclEntry[] { }, returned);
     assertPermission((short)0750);
     assertAclFeature(false);
+    // restart of the cluster
+    restartCluster();
+    s = fs.getAclStatus(path);
+    AclEntry[] afterRestart = s.getEntries().toArray(new AclEntry[0]);
+    assertArrayEquals(returned, afterRestart);
   }
 
   @Test
-  public void testRemoveDefaultAclStickyBit() throws IOException {
+  public void testRemoveDefaultAclStickyBit() throws Exception {
     FileSystem.mkdirs(fs, path, FsPermission.createImmutable((short)01750));
     List<AclEntry> aclSpec = Lists.newArrayList(
       aclEntry(ACCESS, USER, ALL),
@@ -508,6 +528,11 @@ public abstract class FSAclBaseTest {
       aclEntry(ACCESS, GROUP, READ_EXECUTE) }, returned);
     assertPermission((short)011770);
     assertAclFeature(true);
+    // restart of the cluster
+    restartCluster();
+    s = fs.getAclStatus(path);
+    AclEntry[] afterRestart = s.getEntries().toArray(new AclEntry[0]);
+    assertArrayEquals(returned, afterRestart);
   }
 
   @Test(expected=FileNotFoundException.class)
@@ -1137,9 +1162,7 @@ public abstract class FSAclBaseTest {
     assertFilePermissionDenied(fsAsDiana, DIANA, bruceFile);
     try {
       conf.setBoolean(DFSConfigKeys.DFS_PERMISSIONS_ENABLED_KEY, false);
-      destroyFileSystems();
       restartCluster();
-      initFileSystems();
       assertFilePermissionGranted(fsAsDiana, DIANA, bruceFile);
     } finally {
       conf.setBoolean(DFSConfigKeys.DFS_PERMISSIONS_ENABLED_KEY, true);
@@ -1404,10 +1427,12 @@ public abstract class FSAclBaseTest {
    * @throws Exception if restart fails
    */
   private void restartCluster() throws Exception {
+    destroyFileSystems();
     shutdown();
     cluster = new MiniDFSCluster.Builder(conf).numDataNodes(1).format(false)
       .build();
     cluster.waitActive();
+    initFileSystems();
   }
 
   /**