HDFS-8450. Erasure Coding: Consolidate erasure coding zone related implementation into a single class (Contributed by Rakesh R)

hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt

@@ -293,3 +293,6 @@
     HDFS-8556. Erasure Coding: Fix usage of 'createZone' (vinayakumarb)
 
     HDFS-8571. Fix TestErasureCodingCli test (Vinayakumar B via waltersu4549)
+
+    HDFS-8450. Erasure Coding: Consolidate erasure coding zone related
+    implementation into a single class (Rakesh R via vinayakumarb)

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

@@ -60,14 +60,14 @@ public class ErasureCodingZoneManager {
     this.dir = dir;
   }
 
-  ECSchema getECSchema(INodesInPath iip) throws IOException {
-    ErasureCodingZone ecZone = getECZone(iip);
+  ECSchema getErasureCodingSchema(INodesInPath iip) throws IOException {
+    ErasureCodingZone ecZone = getErasureCodingZone(iip);
     return ecZone == null ? null : ecZone.getSchema();
   }
 
-  ErasureCodingZone getECZone(INodesInPath iip) throws IOException {
+  ErasureCodingZone getErasureCodingZone(INodesInPath iip) throws IOException {
     assert dir.hasReadLock();
-    Preconditions.checkNotNull(iip);
+    Preconditions.checkNotNull(iip, "INodes cannot be null");
     List<INode> inodes = iip.getReadOnlyINodes();
     for (int i = inodes.size() - 1; i >= 0; i--) {
       final INode inode = inodes.get(i);
@@ -90,8 +90,8 @@ public class ErasureCodingZoneManager {
           DataInputStream dIn=new DataInputStream(bIn);
           int cellSize = WritableUtils.readVInt(dIn);
           String schemaName = WritableUtils.readString(dIn);
-          ECSchema schema = dir.getFSNamesystem().getECSchemaManager()
-              .getSchema(schemaName);
+          ECSchema schema = dir.getFSNamesystem()
+              .getErasureCodingSchemaManager().getSchema(schemaName);
           return new ErasureCodingZone(dir.getInode(inode.getId())
               .getFullPathName(), schema, cellSize);
         }
@@ -100,22 +100,22 @@ public class ErasureCodingZoneManager {
     return null;
   }
 
-  XAttr createErasureCodingZone(String src, ECSchema schema, int cellSize)
-      throws IOException {
+  List<XAttr> createErasureCodingZone(final INodesInPath srcIIP,
+      ECSchema schema, int cellSize) throws IOException {
     assert dir.hasWriteLock();
-    final INodesInPath srcIIP = dir.getINodesInPath4Write(src, false);
+    Preconditions.checkNotNull(srcIIP, "INodes cannot be null");
+    String src = srcIIP.getPath();
     if (dir.isNonEmptyDirectory(srcIIP)) {
       throw new IOException(
           "Attempt to create an erasure coding zone for a " +
-              "non-empty directory.");
+              "non-empty directory " + src);
     }
-    if (srcIIP != null &&
-        srcIIP.getLastINode() != null &&
+    if (srcIIP.getLastINode() != null &&
         !srcIIP.getLastINode().isDirectory()) {
       throw new IOException("Attempt to create an erasure coding zone " +
-          "for a file.");
+          "for a file " + src);
     }
-    if (getECSchema(srcIIP) != null) {
+    if (getErasureCodingSchema(srcIIP) != null) {
       throw new IOException("Directory " + src + " is already in an " +
           "erasure coding zone.");
     }
@@ -147,14 +147,14 @@ public class ErasureCodingZoneManager {
     xattrs.add(ecXAttr);
     FSDirXAttrOp.unprotectedSetXAttrs(dir, src, xattrs,
         EnumSet.of(XAttrSetFlag.CREATE));
-    return ecXAttr;
+    return xattrs;
   }
 
   void checkMoveValidity(INodesInPath srcIIP, INodesInPath dstIIP, String src)
       throws IOException {
     assert dir.hasReadLock();
-    final ErasureCodingZone srcZone = getECZone(srcIIP);
-    final ErasureCodingZone dstZone = getECZone(dstIIP);
+    final ErasureCodingZone srcZone = getErasureCodingZone(srcIIP);
+    final ErasureCodingZone dstZone = getErasureCodingZone(dstIIP);
     if (srcZone != null && srcZone.getDir().equals(src) && dstZone == null) {
       return;
     }

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

@@ -0,0 +1,217 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hdfs.server.namenode;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.apache.hadoop.fs.XAttr;
+import org.apache.hadoop.fs.permission.FsAction;
+import org.apache.hadoop.hdfs.protocol.ErasureCodingZone;
+import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
+import org.apache.hadoop.io.erasurecode.ECSchema;
+
+/**
+ * Helper class to perform erasure coding related operations.
+ */
+final class FSDirErasureCodingOp {
+
+  /**
+   * Private constructor for preventing FSDirErasureCodingOp object
+   * creation. Static-only class.
+   */
+  private FSDirErasureCodingOp() {}
+
+  /**
+   * Create an erasure coding zone on directory src.
+   *
+   * @param fsn namespace
+   * @param srcArg the path of a directory which will be the root of the
+   *          erasure coding zone. The directory must be empty.
+   * @param schema ECSchema for the erasure coding zone
+   * @param cellSize Cell size of stripe
+   * @param logRetryCache whether to record RPC ids in editlog for retry
+   *          cache rebuilding
+   * @return {@link HdfsFileStatus}
+   * @throws IOException
+   */
+  static HdfsFileStatus createErasureCodingZone(final FSNamesystem fsn,
+      final String srcArg, final ECSchema schema, final int cellSize,
+      final boolean logRetryCache) throws IOException {
+    assert fsn.hasWriteLock();
+
+    String src = srcArg;
+    FSPermissionChecker pc = null;
+    byte[][] pathComponents = null;
+    pathComponents = FSDirectory.getPathComponentsForReservedPath(src);
+    pc = fsn.getPermissionChecker();
+    FSDirectory fsd = fsn.getFSDirectory();
+    src = fsd.resolvePath(pc, src, pathComponents);
+    final INodesInPath iip;
+    List<XAttr> xAttrs;
+    fsd.writeLock();
+    try {
+      iip = fsd.getINodesInPath4Write(src, false);
+      xAttrs = fsn.getErasureCodingZoneManager().createErasureCodingZone(
+          iip, schema, cellSize);
+    } finally {
+      fsd.writeUnlock();
+    }
+    fsn.getEditLog().logSetXAttrs(src, xAttrs, logRetryCache);
+    return fsd.getAuditFileInfo(iip);
+  }
+
+  /**
+   * Get the erasure coding zone information for specified path.
+   *
+   * @param fsn namespace
+   * @param src path
+   * @return {@link ErasureCodingZone}
+   * @throws IOException
+   */
+  static ErasureCodingZone getErasureCodingZone(final FSNamesystem fsn,
+      final String src) throws IOException {
+    assert fsn.hasReadLock();
+
+    final INodesInPath iip = getINodesInPath(fsn, src);
+    return getErasureCodingZoneForPath(fsn, iip);
+  }
+
+  /**
+   * Get erasure coding zone information for specified path.
+   *
+   * @param fsn namespace
+   * @param iip inodes in the path containing the file
+   * @return {@link ErasureCodingZone}
+   * @throws IOException
+   */
+  static ErasureCodingZone getErasureCodingZone(final FSNamesystem fsn,
+      final INodesInPath iip) throws IOException {
+    assert fsn.hasReadLock();
+
+    return getErasureCodingZoneForPath(fsn, iip);
+  }
+
+  /**
+   * Check if the file is in erasure coding zone.
+   *
+   * @param fsn namespace
+   * @param srcArg path
+   * @return true represents the file is in erasure coding zone, false otw
+   * @throws IOException
+   */
+  static boolean isInErasureCodingZone(final FSNamesystem fsn,
+      final String srcArg) throws IOException {
+    assert fsn.hasReadLock();
+
+    final INodesInPath iip = getINodesInPath(fsn, srcArg);
+    return getErasureCodingSchemaForPath(fsn, iip) != null;
+  }
+
+  /**
+   * Check if the file is in erasure coding zone.
+   *
+   * @param fsn namespace
+   * @param iip inodes in the path containing the file
+   * @return true represents the file is in erasure coding zone, false otw
+   * @throws IOException
+   */
+  static boolean isInErasureCodingZone(final FSNamesystem fsn,
+      final INodesInPath iip) throws IOException {
+    return getErasureCodingSchema(fsn, iip) != null;
+  }
+
+  /**
+   * Get erasure coding schema.
+   *
+   * @param fsn namespace
+   * @param iip inodes in the path containing the file
+   * @return {@link ECSchema}
+   * @throws IOException
+   */
+  static ECSchema getErasureCodingSchema(final FSNamesystem fsn,
+      final INodesInPath iip) throws IOException {
+    assert fsn.hasReadLock();
+
+    return getErasureCodingSchemaForPath(fsn, iip);
+  }
+
+  /**
+   * Get available erasure coding schemas.
+   *
+   * @param fsn namespace
+   * @return {@link ECSchema} array
+   */
+  static ECSchema[] getErasureCodingSchemas(final FSNamesystem fsn)
+      throws IOException {
+    assert fsn.hasReadLock();
+
+    return fsn.getErasureCodingSchemaManager().getSchemas();
+  }
+
+  /**
+   * Get the ECSchema specified by the name.
+   *
+   * @param fsn namespace
+   * @param schemaName schema name
+   * @return {@link ECSchema}
+   */
+  static ECSchema getErasureCodingSchema(final FSNamesystem fsn,
+      final String schemaName) throws IOException {
+    assert fsn.hasReadLock();
+
+    return fsn.getErasureCodingSchemaManager().getSchema(schemaName);
+  }
+
+  private static INodesInPath getINodesInPath(final FSNamesystem fsn,
+      final String srcArg) throws IOException {
+    String src = srcArg;
+    final byte[][] pathComponents = FSDirectory
+        .getPathComponentsForReservedPath(src);
+    final FSDirectory fsd = fsn.getFSDirectory();
+    final FSPermissionChecker pc = fsn.getPermissionChecker();
+    src = fsd.resolvePath(pc, src, pathComponents);
+    INodesInPath iip = fsd.getINodesInPath(src, true);
+    if (fsn.isPermissionEnabled()) {
+      fsn.getFSDirectory().checkPathAccess(pc, iip, FsAction.READ);
+    }
+    return iip;
+  }
+
+  private static ErasureCodingZone getErasureCodingZoneForPath(
+      final FSNamesystem fsn, final INodesInPath iip) throws IOException {
+    final FSDirectory fsd = fsn.getFSDirectory();
+    fsd.readLock();
+    try {
+      return fsn.getErasureCodingZoneManager().getErasureCodingZone(iip);
+    } finally {
+      fsd.readUnlock();
+    }
+  }
+
+  private static ECSchema getErasureCodingSchemaForPath(final FSNamesystem fsn,
+      final INodesInPath iip) throws IOException {
+    final FSDirectory fsd = fsn.getFSDirectory();
+    fsd.readLock();
+    try {
+      return fsn.getErasureCodingZoneManager().getErasureCodingSchema(iip);
+    } finally {
+      fsd.readUnlock();
+    }
+  }
+}

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

@@ -385,8 +385,9 @@ class FSDirStatAndListingOp {
 
     final FileEncryptionInfo feInfo = isRawPath ? null :
         fsd.getFileEncryptionInfo(node, snapshot, iip);
-    
-    final ErasureCodingZone ecZone = fsd.getECZone(iip);
+
+    final ErasureCodingZone ecZone = FSDirErasureCodingOp.getErasureCodingZone(
+        fsd.getFSNamesystem(), iip);
     final ECSchema schema = ecZone != null ? ecZone.getSchema() : null;
     final int cellSize = ecZone != null ? ecZone.getCellSize() : 0;
 
@@ -468,7 +469,8 @@ class FSDirStatAndListingOp {
     }
     int childrenNum = node.isDirectory() ?
         node.asDirectory().getChildrenNum(snapshot) : 0;
-    final ErasureCodingZone ecZone = fsd.getECZone(iip);
+    final ErasureCodingZone ecZone = FSDirErasureCodingOp.getErasureCodingZone(
+        fsd.getFSNamesystem(), iip);
     final ECSchema schema = ecZone != null ? ecZone.getSchema() : null;
     final int cellSize = ecZone != null ? ecZone.getCellSize() : 0;
 

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

@@ -495,7 +495,8 @@ class FSDirWriteFileOp {
       INodesInPath iip = fsd.addINode(existing, newNode);
       if (iip != null) {
         // check if the file is in an EC zone
-        if (fsd.isInECZone(iip)) {
+        if (FSDirErasureCodingOp.isInErasureCodingZone(fsd.getFSNamesystem(),
+            iip)) {
           newNode.addStripedBlocksFeature();
         }
         if (aclEntries != null) {
@@ -530,7 +531,8 @@ class FSDirWriteFileOp {
       // associate new last block for the file
       final BlockInfo blockInfo;
       if (isStriped) {
-        ECSchema ecSchema = fsd.getECSchema(inodesInPath);
+        ECSchema ecSchema = FSDirErasureCodingOp.getErasureCodingSchema(
+            fsd.getFSNamesystem(), inodesInPath);
         short numDataUnits = (short) ecSchema.getNumDataUnits();
         short numParityUnits = (short) ecSchema.getNumParityUnits();
         short numLocations = (short) (numDataUnits + numParityUnits);
@@ -586,7 +588,9 @@ class FSDirWriteFileOp {
     fsd.writeLock();
     try {
       newiip = fsd.addINode(existing, newNode);
-      if (newiip != null && fsd.isInECZone(newiip)) {
+      if (newiip != null
+          && FSDirErasureCodingOp.isInErasureCodingZone(fsd.getFSNamesystem(),
+              newiip)) {
         newNode.addStripedBlocksFeature();
       }
     } finally {

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

@@ -40,7 +40,6 @@ import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.XAttrHelper;
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
-import org.apache.hadoop.hdfs.protocol.ErasureCodingZone;
 import org.apache.hadoop.hdfs.protocol.EncryptionZone;
 import org.apache.hadoop.hdfs.protocol.FSLimitException.MaxDirectoryItemsExceededException;
 import org.apache.hadoop.hdfs.protocol.FSLimitException.PathComponentTooLongException;
@@ -58,7 +57,6 @@ import org.apache.hadoop.hdfs.server.common.HdfsServerConstants;
 import org.apache.hadoop.hdfs.server.namenode.INode.BlocksMapUpdateInfo;
 import org.apache.hadoop.hdfs.util.ByteArray;
 import org.apache.hadoop.hdfs.util.EnumCounters;
-import org.apache.hadoop.io.erasurecode.ECSchema;
 import org.apache.hadoop.security.AccessControlException;
 import org.apache.hadoop.security.UserGroupInformation;
 import org.slf4j.Logger;
@@ -1225,38 +1223,6 @@ public class FSDirectory implements Closeable {
     }
   }
 
-  XAttr createErasureCodingZone(String src, ECSchema schema, int cellSize)
-      throws IOException {
-    writeLock();
-    try {
-      return ecZoneManager.createErasureCodingZone(src, schema, cellSize);
-    } finally {
-      writeUnlock();
-    }
-  }
-
-  public boolean isInECZone(INodesInPath iip) throws IOException {
-    return getECSchema(iip) != null;
-  }
-
-  ECSchema getECSchema(INodesInPath iip) throws IOException {
-    readLock();
-    try {
-      return ecZoneManager.getECSchema(iip);
-    } finally {
-      readUnlock();
-    }
-  }
-
-  ErasureCodingZone getECZone(INodesInPath iip) throws IOException {
-    readLock();
-    try {
-      return ecZoneManager.getECZone(iip);
-    } finally {
-      readUnlock();
-    }
-  }
-
   static INode resolveLastINode(INodesInPath iip) throws FileNotFoundException {
     INode inode = iip.getLastINode();
     if (inode == null) {

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

@@ -417,8 +417,9 @@ public class FSEditLogLoader {
       // Update the salient file attributes.
       newFile.setAccessTime(addCloseOp.atime, Snapshot.CURRENT_STATE_ID);
       newFile.setModificationTime(addCloseOp.mtime, Snapshot.CURRENT_STATE_ID);
-      updateBlocks(fsDir, addCloseOp, iip, newFile,
-          fsDir.getECSchema(iip), fsDir.isInECZone(iip));
+      ECSchema ecSchema = FSDirErasureCodingOp.getErasureCodingSchema(
+          fsDir.getFSNamesystem(), iip);
+      updateBlocks(fsDir, addCloseOp, iip, newFile, ecSchema);
       break;
     }
     case OP_CLOSE: {
@@ -438,8 +439,9 @@ public class FSEditLogLoader {
       // Update the salient file attributes.
       file.setAccessTime(addCloseOp.atime, Snapshot.CURRENT_STATE_ID);
       file.setModificationTime(addCloseOp.mtime, Snapshot.CURRENT_STATE_ID);
-      updateBlocks(fsDir, addCloseOp, iip, file,
-          fsDir.getECSchema(iip), fsDir.isInECZone(iip));
+      ECSchema ecSchema = FSDirErasureCodingOp.getErasureCodingSchema(
+          fsDir.getFSNamesystem(), iip);
+      updateBlocks(fsDir, addCloseOp, iip, file, ecSchema);
 
       // Now close the file
       if (!file.isUnderConstruction() &&
@@ -497,8 +499,9 @@ public class FSEditLogLoader {
       INodesInPath iip = fsDir.getINodesInPath(path, true);
       INodeFile oldFile = INodeFile.valueOf(iip.getLastINode(), path);
       // Update in-memory data structures
-      updateBlocks(fsDir, updateOp, iip, oldFile,
-          fsDir.getECSchema(iip), fsDir.isInECZone(iip));
+      ECSchema ecSchema = FSDirErasureCodingOp.getErasureCodingSchema(
+          fsDir.getFSNamesystem(), iip);
+      updateBlocks(fsDir, updateOp, iip, oldFile, ecSchema);
 
       if (toAddRetryCache) {
         fsNamesys.addCacheEntry(updateOp.rpcClientId, updateOp.rpcCallId);
@@ -515,8 +518,9 @@ public class FSEditLogLoader {
       INodesInPath iip = fsDir.getINodesInPath(path, true);
       INodeFile oldFile = INodeFile.valueOf(iip.getLastINode(), path);
       // add the new block to the INodeFile
-      addNewBlock(addBlockOp, oldFile,
-          fsDir.getECSchema(iip), fsDir.isInECZone(iip));
+      ECSchema ecSchema = FSDirErasureCodingOp.getErasureCodingSchema(
+          fsDir.getFSNamesystem(), iip);
+      addNewBlock(addBlockOp, oldFile, ecSchema);
       break;
     }
     case OP_SET_REPLICATION: {
@@ -957,8 +961,7 @@ public class FSEditLogLoader {
   /**
    * Add a new block into the given INodeFile
    */
-  private void addNewBlock(AddBlockOp op, INodeFile file,
-                           ECSchema schema, boolean isStriped)
+  private void addNewBlock(AddBlockOp op, INodeFile file, ECSchema ecSchema)
       throws IOException {
     BlockInfo[] oldBlocks = file.getBlocks();
     Block pBlock = op.getPenultimateBlock();
@@ -986,8 +989,9 @@ public class FSEditLogLoader {
     }
     // add the new block
     final BlockInfo newBlockInfo;
+    boolean isStriped = ecSchema != null;
     if (isStriped) {
-      newBlockInfo = new BlockInfoStripedUnderConstruction(newBlock, schema);
+      newBlockInfo = new BlockInfoStripedUnderConstruction(newBlock, ecSchema);
     } else {
       newBlockInfo = new BlockInfoContiguousUnderConstruction(newBlock,
           file.getPreferredBlockReplication());
@@ -1002,8 +1006,7 @@ public class FSEditLogLoader {
    * @throws IOException
    */
   private void updateBlocks(FSDirectory fsDir, BlockListUpdatingOp op,
-      INodesInPath iip, INodeFile file, ECSchema schema,
-      boolean isStriped) throws IOException {
+      INodesInPath iip, INodeFile file, ECSchema ecSchema) throws IOException {
     // Update its block list
     BlockInfo[] oldBlocks = file.getBlocks();
     Block[] newBlocks = op.getBlocks();
@@ -1062,6 +1065,7 @@ public class FSEditLogLoader {
         throw new IOException("Trying to delete non-existant block " + oldBlock);
       }
     } else if (newBlocks.length > oldBlocks.length) {
+      final boolean isStriped = ecSchema != null;
       // We're adding blocks
       for (int i = oldBlocks.length; i < newBlocks.length; i++) {
         Block newBlock = newBlocks[i];
@@ -1071,7 +1075,7 @@ public class FSEditLogLoader {
           // what about an old-version fsync() where fsync isn't called
           // until several blocks in?
           if (isStriped) {
-            newBI = new BlockInfoStripedUnderConstruction(newBlock, schema);
+            newBI = new BlockInfoStripedUnderConstruction(newBlock, ecSchema);
           } else {
             newBI = new BlockInfoContiguousUnderConstruction(newBlock,
                 file.getPreferredBlockReplication());

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

@@ -2408,7 +2408,7 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
     readLock();
     try {
       checkOperation(OperationCategory.READ);
-      if (!isInECZone(src)) {
+      if (!FSDirErasureCodingOp.isInErasureCodingZone(this, src)) {
         blockManager.verifyReplication(src, replication, clientMachine);
       }
     } finally {
@@ -3675,7 +3675,8 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
     final long diff;
     final short replicationFactor;
     if (fileINode.isStriped()) {
-      final ECSchema ecSchema = dir.getECSchema(iip);
+      final ECSchema ecSchema = FSDirErasureCodingOp.getErasureCodingSchema(
+          this, iip);
       final short numDataUnits = (short) ecSchema.getNumDataUnits();
       final short numParityUnits = (short) ecSchema.getNumParityUnits();
 
@@ -6670,11 +6671,16 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
     return cacheManager;
   }
 
-  /** @return the schema manager. */
-  public ErasureCodingSchemaManager getECSchemaManager() {
+  /** @return the ErasureCodingSchemaManager. */
+  public ErasureCodingSchemaManager getErasureCodingSchemaManager() {
     return ecSchemaManager;
   }
 
+  /** @return the ErasureCodingZoneManager. */
+  public ErasureCodingZoneManager getErasureCodingZoneManager() {
+    return dir.ecZoneManager;
+  }
+
   @Override  // NameNodeMXBean
   public String getCorruptFiles() {
     List<String> list = new ArrayList<String>();
@@ -7579,47 +7585,25 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
   void createErasureCodingZone(final String srcArg, final ECSchema schema,
       int cellSize, final boolean logRetryCache) throws IOException,
       UnresolvedLinkException, SafeModeException, AccessControlException {
-    String src = srcArg;
+    checkSuperuserPrivilege();
+    checkOperation(OperationCategory.WRITE);
     HdfsFileStatus resultingStat = null;
-    FSPermissionChecker pc = null;
-    byte[][] pathComponents = null;
     boolean success = false;
-    try {
-      checkSuperuserPrivilege();
-      checkOperation(OperationCategory.WRITE);
-      pathComponents =
-          FSDirectory.getPathComponentsForReservedPath(src);
-      pc = getPermissionChecker();
-    } catch (Throwable e) {
-      logAuditEvent(success, "createErasureCodingZone", srcArg);
-      throw e;
-    }
     writeLock();
     try {
-      checkSuperuserPrivilege();
       checkOperation(OperationCategory.WRITE);
-      checkNameNodeSafeMode("Cannot create erasure coding zone on " + src);
-      src = dir.resolvePath(pc, src, pathComponents);
-
-      final XAttr ecXAttr = dir.createErasureCodingZone(src, schema, cellSize);
-      List<XAttr> xAttrs = Lists.newArrayListWithCapacity(1);
-      xAttrs.add(ecXAttr);
-      getEditLog().logSetXAttrs(src, xAttrs, logRetryCache);
-      final INodesInPath iip = dir.getINodesInPath4Write(src, false);
-      resultingStat = dir.getAuditFileInfo(iip);
+      checkNameNodeSafeMode("Cannot create erasure coding zone on " + srcArg);
+      resultingStat = FSDirErasureCodingOp.createErasureCodingZone(this,
+          srcArg, schema, cellSize, logRetryCache);
       success = true;
     } finally {
       writeUnlock();
+      if (success) {
+        getEditLog().logSync();
+      }
+      logAuditEvent(success, "createErasureCodingZone", srcArg, null,
+          resultingStat);
     }
-    getEditLog().logSync();
-    logAuditEvent(success, "createErasureCodingZone", srcArg, null, resultingStat);
-  }
-
-  private boolean isInECZone(String src) throws IOException {
-    byte[][] pathComponents = FSDirectory.getPathComponentsForReservedPath(src);
-    src = FSDirectory.resolvePath(src, pathComponents, dir);
-    final INodesInPath iip = dir.getINodesInPath(src, true);
-    return dir.isInECZone(iip);
   }
 
   /**
@@ -7638,15 +7622,15 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
   }
 
   /**
-   * Get available ECSchemas
+   * Get available erasure coding schemas
    */
-  ECSchema[] getECSchemas() throws IOException {
+  ECSchema[] getErasureCodingSchemas() throws IOException {
     checkOperation(OperationCategory.READ);
     waitForLoadingFSImage();
     readLock();
     try {
       checkOperation(OperationCategory.READ);
-      return ecSchemaManager.getSchemas();
+      return FSDirErasureCodingOp.getErasureCodingSchemas(this);
     } finally {
       readUnlock();
     }
@@ -7655,13 +7639,13 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
   /**
    * Get the ECSchema specified by the name
    */
-  ECSchema getECSchema(String schemaName) throws IOException {
+  ECSchema getErasureCodingSchema(String schemaName) throws IOException {
     checkOperation(OperationCategory.READ);
     waitForLoadingFSImage();
     readLock();
     try {
       checkOperation(OperationCategory.READ);
-      return ecSchemaManager.getSchema(schemaName);
+      return FSDirErasureCodingOp.getErasureCodingSchema(this, schemaName);
     } finally {
       readUnlock();
     }
@@ -7854,16 +7838,7 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
   @Override
   public ErasureCodingZone getErasureCodingZoneForPath(String src)
       throws IOException {
-    final byte[][] pathComponents = FSDirectory
-        .getPathComponentsForReservedPath(src);
-    final FSPermissionChecker pc = getPermissionChecker();
-    src = dir.resolvePath(pc, src, pathComponents);
-    final INodesInPath iip = dir.getINodesInPath(src, true);
-    if (isPermissionEnabled) {
-      dir.checkPathAccess(pc, iip, FsAction.READ);
-    }
-    return dir.getECZone(iip);
+    return FSDirErasureCodingOp.getErasureCodingZone(this, src);
   }
-
 }
 

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

@@ -2037,7 +2037,7 @@ class NameNodeRpcServer implements NamenodeProtocols {
   @Override // ClientProtocol
   public ECSchema[] getECSchemas() throws IOException {
     checkNNStartup();
-    return namesystem.getECSchemas();
+    return namesystem.getErasureCodingSchemas();
   }
 
   @Override // ClientProtocol

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

@@ -572,9 +572,17 @@ public class NamenodeFsck implements DataEncryptionKeyFactory {
       // count expected replicas
       short targetFileReplication;
       if(file.getReplication() == 0) {
-        INode inode = namenode.getNamesystem().getFSDirectory().getINode(path);
-        INodesInPath iip = INodesInPath.fromINode(inode);
-        ECSchema ecSchema = namenode.getNamesystem().getFSDirectory().getECSchema(iip);
+        final FSNamesystem fsn = namenode.getNamesystem();
+        final ECSchema ecSchema;
+        fsn.readLock();
+        try {
+          INode inode = namenode.getNamesystem().getFSDirectory()
+              .getINode(path);
+          INodesInPath iip = INodesInPath.fromINode(inode);
+          ecSchema = FSDirErasureCodingOp.getErasureCodingSchema(fsn, iip);
+        } finally {
+          fsn.readUnlock();
+        }
         targetFileReplication = (short) (ecSchema.getNumDataUnits() + ecSchema.getNumParityUnits());
       } else {
         targetFileReplication = file.getReplication();

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

@@ -71,8 +71,13 @@ public class NameNodeAdapter {
   public static HdfsFileStatus getFileInfo(NameNode namenode, String src,
       boolean resolveLink) throws AccessControlException, UnresolvedLinkException,
         StandbyException, IOException {
-    return FSDirStatAndListingOp.getFileInfo(namenode.getNamesystem()
-            .getFSDirectory(), src, resolveLink);
+    namenode.getNamesystem().readLock();
+    try {
+      return FSDirStatAndListingOp.getFileInfo(namenode.getNamesystem()
+          .getFSDirectory(), src, resolveLink);
+    } finally {
+      namenode.getNamesystem().readUnlock();
+    }
   }
   
   public static boolean mkdirs(NameNode namenode, String src,