HDFS-11623. Move system erasure coding policies into hadoop-hdfs-client.

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/HdfsConstants.java

@@ -144,12 +144,6 @@ public final class HdfsConstants {
     ALL, LIVE, DEAD, DECOMMISSIONING, ENTERING_MAINTENANCE
   }
 
-  public static final byte RS_6_3_POLICY_ID = 1;
-  public static final byte RS_3_2_POLICY_ID = 2;
-  public static final byte RS_6_3_LEGACY_POLICY_ID = 3;
-  public static final byte XOR_2_1_POLICY_ID = 4;
-  public static final byte RS_10_4_POLICY_ID = 5;
-
   /* Hidden constructor */
   protected HdfsConstants() {
   }

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/SystemErasureCodingPolicies.java

@@ -0,0 +1,121 @@
+/**
+ * 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.protocol;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.io.erasurecode.ErasureCodeConstants;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.TreeMap;
+
+/**
+ * <p>The set of built-in erasure coding policies.</p>
+ * <p>Although this is a private class, EC policy IDs need to be treated like a
+ * stable interface. Adding, modifying, or removing built-in policies can cause
+ * inconsistencies with older clients.</p>
+ */
+@InterfaceAudience.Private
+@InterfaceStability.Stable
+public final class SystemErasureCodingPolicies {
+
+  // Private constructor, this is a utility class.
+  private SystemErasureCodingPolicies() {}
+
+  // 64 KB
+  private static final int DEFAULT_CELLSIZE = 64 * 1024;
+
+  public static final byte RS_6_3_POLICY_ID = 1;
+  private static final ErasureCodingPolicy SYS_POLICY1 =
+      new ErasureCodingPolicy(ErasureCodeConstants.RS_6_3_SCHEMA,
+          DEFAULT_CELLSIZE, RS_6_3_POLICY_ID);
+
+  public static final byte RS_3_2_POLICY_ID = 2;
+  private static final ErasureCodingPolicy SYS_POLICY2 =
+      new ErasureCodingPolicy(ErasureCodeConstants.RS_3_2_SCHEMA,
+          DEFAULT_CELLSIZE, RS_3_2_POLICY_ID);
+
+  public static final byte RS_6_3_LEGACY_POLICY_ID = 3;
+  private static final ErasureCodingPolicy SYS_POLICY3 =
+      new ErasureCodingPolicy(ErasureCodeConstants.RS_6_3_LEGACY_SCHEMA,
+          DEFAULT_CELLSIZE, RS_6_3_LEGACY_POLICY_ID);
+
+  public static final byte XOR_2_1_POLICY_ID = 4;
+  private static final ErasureCodingPolicy SYS_POLICY4 =
+      new ErasureCodingPolicy(ErasureCodeConstants.XOR_2_1_SCHEMA,
+          DEFAULT_CELLSIZE, XOR_2_1_POLICY_ID);
+
+  public static final byte RS_10_4_POLICY_ID = 5;
+  private static final ErasureCodingPolicy SYS_POLICY5 =
+      new ErasureCodingPolicy(ErasureCodeConstants.RS_10_4_SCHEMA,
+          DEFAULT_CELLSIZE, RS_10_4_POLICY_ID);
+
+  private static final List<ErasureCodingPolicy> SYS_POLICIES =
+      Collections.unmodifiableList(Arrays.asList(
+          SYS_POLICY1, SYS_POLICY2, SYS_POLICY3, SYS_POLICY4,
+          SYS_POLICY5));
+
+  /**
+   * System policies sorted by name for fast querying.
+   */
+  private static final Map<String, ErasureCodingPolicy> SYSTEM_POLICIES_BY_NAME;
+
+  /**
+   * System policies sorted by ID for fast querying.
+   */
+  private static final Map<Byte, ErasureCodingPolicy> SYSTEM_POLICIES_BY_ID;
+
+  /**
+   * Populate the lookup maps in a static block.
+   */
+  static {
+    SYSTEM_POLICIES_BY_NAME = new TreeMap<>();
+    SYSTEM_POLICIES_BY_ID = new TreeMap<>();
+    for (ErasureCodingPolicy policy : SYS_POLICIES) {
+      SYSTEM_POLICIES_BY_NAME.put(policy.getName(), policy);
+      SYSTEM_POLICIES_BY_ID.put(policy.getId(), policy);
+    }
+  }
+
+  /**
+   * Get system defined policies.
+   * @return system policies
+   */
+  public static List<ErasureCodingPolicy> getPolicies() {
+    return SYS_POLICIES;
+  }
+
+  /**
+   * Get a policy by policy ID.
+   * @return ecPolicy, or null if not found
+   */
+  public static ErasureCodingPolicy getByID(byte id) {
+    return SYSTEM_POLICIES_BY_ID.get(id);
+  }
+
+  /**
+   * Get a policy by policy name.
+   * @return ecPolicy, or null if not found
+   */
+  public static ErasureCodingPolicy getByName(String name) {
+    return SYSTEM_POLICIES_BY_NAME.get(name);
+  }
+}

hadoop-hdfs-project/hadoop-hdfs-httpfs/src/test/java/org/apache/hadoop/test/TestHdfsHelper.java

@@ -31,9 +31,8 @@ import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSTestUtil;
 import org.apache.hadoop.hdfs.DistributedFileSystem;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.StripedFileTestUtil;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
-import org.apache.hadoop.hdfs.protocol.HdfsConstants;
-import org.apache.hadoop.hdfs.server.namenode.ErasureCodingPolicyManager;
 import org.junit.Test;
 import org.junit.runners.model.FrameworkMethod;
 import org.junit.runners.model.Statement;
@@ -142,7 +141,7 @@ public class TestHdfsHelper extends TestDirHelper {
   public static final Path ERASURE_CODING_DIR = new Path("/ec");
   public static final Path ERASURE_CODING_FILE = new Path("/ec/ecfile");
   public static final ErasureCodingPolicy ERASURE_CODING_POLICY =
-      ErasureCodingPolicyManager.getPolicyByID(HdfsConstants.XOR_2_1_POLICY_ID);
+      StripedFileTestUtil.getDefaultECPolicy();
 
   private static MiniDFSCluster MINI_DFS = null;
 

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

@@ -20,11 +20,10 @@ package org.apache.hadoop.hdfs.server.namenode;
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
-import org.apache.hadoop.io.erasurecode.ErasureCodeConstants;
 
-import java.util.Arrays;
 import java.util.Map;
 import java.util.TreeMap;
 import java.util.stream.Collectors;
@@ -40,50 +39,12 @@ import java.util.stream.Collectors;
 @InterfaceAudience.LimitedPrivate({"HDFS"})
 public final class ErasureCodingPolicyManager {
 
-  /**
-   * TODO: HDFS-8095.
-   */
-  private static final int DEFAULT_CELLSIZE = 64 * 1024;
-  private static final ErasureCodingPolicy SYS_POLICY1 =
-      new ErasureCodingPolicy(ErasureCodeConstants.RS_6_3_SCHEMA,
-          DEFAULT_CELLSIZE, HdfsConstants.RS_6_3_POLICY_ID);
-  private static final ErasureCodingPolicy SYS_POLICY2 =
-      new ErasureCodingPolicy(ErasureCodeConstants.RS_3_2_SCHEMA,
-          DEFAULT_CELLSIZE, HdfsConstants.RS_3_2_POLICY_ID);
-  private static final ErasureCodingPolicy SYS_POLICY3 =
-      new ErasureCodingPolicy(ErasureCodeConstants.RS_6_3_LEGACY_SCHEMA,
-          DEFAULT_CELLSIZE, HdfsConstants.RS_6_3_LEGACY_POLICY_ID);
-  private static final ErasureCodingPolicy SYS_POLICY4 =
-      new ErasureCodingPolicy(ErasureCodeConstants.XOR_2_1_SCHEMA,
-          DEFAULT_CELLSIZE, HdfsConstants.XOR_2_1_POLICY_ID);
-  private static final ErasureCodingPolicy SYS_POLICY5 =
-      new ErasureCodingPolicy(ErasureCodeConstants.RS_10_4_SCHEMA,
-          DEFAULT_CELLSIZE, HdfsConstants.RS_10_4_POLICY_ID);
-
-  //We may add more later.
-  private static final ErasureCodingPolicy[] SYS_POLICIES =
-      new ErasureCodingPolicy[]{SYS_POLICY1, SYS_POLICY2, SYS_POLICY3,
-          SYS_POLICY4, SYS_POLICY5};
-
   // Supported storage policies for striped EC files
   private static final byte[] SUITABLE_STORAGE_POLICIES_FOR_EC_STRIPED_MODE =
       new byte[]{
           HdfsConstants.HOT_STORAGE_POLICY_ID,
           HdfsConstants.COLD_STORAGE_POLICY_ID,
           HdfsConstants.ALLSSD_STORAGE_POLICY_ID};
-  /**
-   * All supported policies maintained in NN memory for fast querying,
-   * identified and sorted by its name.
-   */
-  private static final Map<String, ErasureCodingPolicy> SYSTEM_POLICIES_BY_NAME;
-
-  static {
-    // Create a hashmap of all available policies for quick lookup by name
-    SYSTEM_POLICIES_BY_NAME = new TreeMap<>();
-    for (ErasureCodingPolicy policy : SYS_POLICIES) {
-      SYSTEM_POLICIES_BY_NAME.put(policy.getName(), policy);
-    }
-  }
 
   /**
    * All enabled policies maintained in NN memory for fast querying,
@@ -101,9 +62,10 @@ public final class ErasureCodingPolicyManager {
       if (policyName.trim().isEmpty()) {
         continue;
       }
-      ErasureCodingPolicy ecPolicy = SYSTEM_POLICIES_BY_NAME.get(policyName);
+      ErasureCodingPolicy ecPolicy =
+          SystemErasureCodingPolicies.getByName(policyName);
       if (ecPolicy == null) {
-        String sysPolicies = Arrays.asList(SYS_POLICIES).stream()
+        String sysPolicies = SystemErasureCodingPolicies.getPolicies().stream()
             .map(ErasureCodingPolicy::getName)
             .collect(Collectors.joining(", "));
         String msg = String.format("EC policy '%s' specified at %s is not a " +
@@ -124,35 +86,6 @@ public final class ErasureCodingPolicyManager {
      */
   }
 
-  /**
-   * Get system defined policies.
-   * @return system policies
-   */
-  public static ErasureCodingPolicy[] getSystemPolicies() {
-    return SYS_POLICIES;
-  }
-
-  /**
-   * Get a policy by policy ID.
-   * @return ecPolicy, or null if not found
-   */
-  public static ErasureCodingPolicy getPolicyByID(byte id) {
-    for (ErasureCodingPolicy policy : SYS_POLICIES) {
-      if (policy.getId() == id) {
-        return policy;
-      }
-    }
-    return null;
-  }
-
-  /**
-   * Get a policy by policy name.
-   * @return ecPolicy, or null if not found
-   */
-  public static ErasureCodingPolicy getPolicyByName(String name) {
-    return SYSTEM_POLICIES_BY_NAME.get(name);
-  }
-
   /**
    * Get the set of enabled policies.
    * @return all policies

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

@@ -37,6 +37,7 @@ import org.apache.hadoop.fs.XAttrSetFlag;
 import org.apache.hadoop.fs.permission.FsAction;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.XAttrHelper;
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
 import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
 import org.apache.hadoop.hdfs.server.namenode.FSDirectory.DirOp;
@@ -302,7 +303,7 @@ final class FSDirErasureCodingOp {
         if (inode.isFile()) {
           byte id = inode.asFile().getErasureCodingPolicyID();
           return id < 0 ? null :
-              ErasureCodingPolicyManager.getPolicyByID(id);
+              SystemErasureCodingPolicies.getByID(id);
         }
         // We don't allow setting EC policies on paths with a symlink. Thus
         // if a symlink is encountered, the dir shouldn't have EC policy.
@@ -317,8 +318,7 @@ final class FSDirErasureCodingOp {
             ByteArrayInputStream bIn = new ByteArrayInputStream(xattr.getValue());
             DataInputStream dIn = new DataInputStream(bIn);
             String ecPolicyName = WritableUtils.readString(dIn);
-            return ErasureCodingPolicyManager
-                .getPolicyByName(ecPolicyName);
+            return SystemErasureCodingPolicies.getByName(ecPolicyName);
           }
         }
       }

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

@@ -39,6 +39,7 @@ import org.apache.hadoop.fs.permission.PermissionStatus;
 import org.apache.hadoop.fs.StorageType;
 import org.apache.hadoop.fs.XAttr;
 import org.apache.hadoop.hdfs.protocol.Block;
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.protocol.proto.HdfsProtos.BlockProto;
@@ -335,7 +336,7 @@ public final class FSImageFormatPBINode {
       assert ((!isStriped) || (isStriped && !f.hasReplication()));
       Short replication = (!isStriped ? (short) f.getReplication() : null);
       ErasureCodingPolicy ecPolicy = isStriped ?
-          ErasureCodingPolicyManager.getPolicyByID(
+          SystemErasureCodingPolicies.getByID(
               (byte) f.getErasureCodingPolicyID()) : null;
       Byte ecPolicyID = (isStriped ? ecPolicy.getId() : null);
 

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

@@ -37,6 +37,7 @@ import org.apache.hadoop.fs.permission.PermissionStatus;
 import org.apache.hadoop.fs.StorageType;
 import org.apache.hadoop.hdfs.protocol.Block;
 import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.protocol.QuotaExceededException;
@@ -191,8 +192,8 @@ public class INodeFile extends INodeWithAdditionalFields
       if (blockType == STRIPED) {
         Preconditions.checkArgument(replication == null &&
             erasureCodingPolicyID != null);
-        Preconditions.checkArgument(ErasureCodingPolicyManager
-            .getPolicyByID(erasureCodingPolicyID) != null,
+        Preconditions.checkArgument(SystemErasureCodingPolicies
+                .getByID(erasureCodingPolicyID) != null,
             "Could not find EC policy with ID 0x" + StringUtils
                 .byteToHexString(erasureCodingPolicyID));
         layoutRedundancy |= BLOCK_TYPE_MASK_STRIPED;
@@ -516,8 +517,7 @@ public class INodeFile extends INodeWithAdditionalFields
     }
 
     ErasureCodingPolicy ecPolicy =
-        ErasureCodingPolicyManager.getPolicyByID(
-            getErasureCodingPolicyID());
+        SystemErasureCodingPolicies.getByID(getErasureCodingPolicyID());
     Preconditions.checkNotNull(ecPolicy, "Could not find EC policy with ID 0x"
         + StringUtils.byteToHexString(getErasureCodingPolicyID()));
     return (short) (ecPolicy.getNumDataUnits() + ecPolicy.getNumParityUnits());

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

@@ -113,6 +113,7 @@ import org.apache.hadoop.hdfs.protocol.DatanodeID;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo.AdminStates;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo.DatanodeInfoBuilder;
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
@@ -138,7 +139,6 @@ import org.apache.hadoop.hdfs.server.datanode.DataNodeLayoutVersion;
 import org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset;
 import org.apache.hadoop.hdfs.server.datanode.TestTransferRbw;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
-import org.apache.hadoop.hdfs.server.namenode.ErasureCodingPolicyManager;
 import org.apache.hadoop.hdfs.server.namenode.FSDirectory;
 import org.apache.hadoop.hdfs.server.namenode.FSEditLog;
 import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
@@ -283,8 +283,7 @@ public class DFSTestUtil {
 
   public static void enableAllECPolicies(Configuration conf) {
     // Enable all the available EC policies
-    String policies =
-        Arrays.asList(ErasureCodingPolicyManager.getSystemPolicies()).stream()
+    String policies = SystemErasureCodingPolicies.getPolicies().stream()
         .map(ErasureCodingPolicy::getName)
         .collect(Collectors.joining(","));
     conf.set(DFSConfigKeys.DFS_NAMENODE_EC_POLICIES_ENABLED_KEY, policies);

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

@@ -27,13 +27,12 @@ import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.hdfs.client.impl.BlockReaderTestUtil;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
-import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
 import org.apache.hadoop.hdfs.protocol.LocatedStripedBlock;
-import org.apache.hadoop.hdfs.server.namenode.ErasureCodingPolicyManager;
 import org.apache.hadoop.hdfs.util.StripedBlockUtil;
 import org.apache.hadoop.hdfs.web.WebHdfsFileSystem.WebHdfsInputStream;
 import org.apache.hadoop.io.IOUtils;
@@ -567,7 +566,6 @@ public class StripedFileTestUtil {
    * @return ErasureCodingPolicy
    */
   public static ErasureCodingPolicy getDefaultECPolicy() {
-    return ErasureCodingPolicyManager.getPolicyByID(
-        HdfsConstants.RS_6_3_POLICY_ID);
+    return SystemErasureCodingPolicies.getPolicies().get(0);
   }
 }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSRSDefault10x4StripedInputStream.java

@@ -17,9 +17,8 @@
  */
 package org.apache.hadoop.hdfs;
 
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
-import org.apache.hadoop.hdfs.protocol.HdfsConstants;
-import org.apache.hadoop.hdfs.server.namenode.ErasureCodingPolicyManager;
 
 /**
  * This tests read operation of DFS striped file with RS-10-4-64k
@@ -29,7 +28,7 @@ public class TestDFSRSDefault10x4StripedInputStream extends
     TestDFSStripedInputStream {
 
   public ErasureCodingPolicy getEcPolicy() {
-    return ErasureCodingPolicyManager.getPolicyByID(
-        HdfsConstants.RS_10_4_POLICY_ID);
+    return SystemErasureCodingPolicies.getByID(
+        SystemErasureCodingPolicies.RS_10_4_POLICY_ID);
   }
 }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSRSDefault10x4StripedOutputStream.java

@@ -17,9 +17,8 @@
  */
 package org.apache.hadoop.hdfs;
 
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
-import org.apache.hadoop.hdfs.protocol.HdfsConstants;
-import org.apache.hadoop.hdfs.server.namenode.ErasureCodingPolicyManager;
 
 /**
  * This tests write operation of DFS striped file with RS-10-4-64k
@@ -30,7 +29,7 @@ public class TestDFSRSDefault10x4StripedOutputStream
 
   @Override
   public ErasureCodingPolicy getEcPolicy() {
-    return ErasureCodingPolicyManager.getPolicyByID(
-        HdfsConstants.RS_10_4_POLICY_ID);
+    return SystemErasureCodingPolicies.getByID(
+        SystemErasureCodingPolicies.RS_10_4_POLICY_ID);
   }
 }

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSRSDefault10x4StripedOutputStreamWithFailure.java

@@ -17,9 +17,8 @@
  */
 package org.apache.hadoop.hdfs;
 
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
-import org.apache.hadoop.hdfs.protocol.HdfsConstants;
-import org.apache.hadoop.hdfs.server.namenode.ErasureCodingPolicyManager;
 
 /**
  * This tests write operation of DFS striped file with RS-10-4-64k
@@ -30,7 +29,7 @@ public class TestDFSRSDefault10x4StripedOutputStreamWithFailure
 
   @Override
   public ErasureCodingPolicy getEcPolicy() {
-    return ErasureCodingPolicyManager.getPolicyByID(
-        HdfsConstants.RS_10_4_POLICY_ID);
+    return SystemErasureCodingPolicies.getByID(
+        SystemErasureCodingPolicies.RS_10_4_POLICY_ID);
   }
 }

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

@@ -16,9 +16,8 @@
  * limitations under the License.
  */
 package org.apache.hadoop.hdfs;
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
-import org.apache.hadoop.hdfs.protocol.HdfsConstants;
-import org.apache.hadoop.hdfs.server.namenode.ErasureCodingPolicyManager;
 
 /**
  * This tests read operation of DFS striped file with XOR-2-1-64k erasure code
@@ -27,7 +26,7 @@ import org.apache.hadoop.hdfs.server.namenode.ErasureCodingPolicyManager;
 public class TestDFSXORStripedInputStream extends TestDFSStripedInputStream{
 
   public ErasureCodingPolicy getEcPolicy() {
-    return ErasureCodingPolicyManager.getPolicyByID(
-        HdfsConstants.XOR_2_1_POLICY_ID);
+    return SystemErasureCodingPolicies.getByID(
+        SystemErasureCodingPolicies.XOR_2_1_POLICY_ID);
   }
 }

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

@@ -17,9 +17,8 @@
  */
 package org.apache.hadoop.hdfs;
 
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
-import org.apache.hadoop.hdfs.protocol.HdfsConstants;
-import org.apache.hadoop.hdfs.server.namenode.ErasureCodingPolicyManager;
 
 /**
  * This tests write operation of DFS striped file with XOR-2-1-64k erasure code
@@ -29,7 +28,7 @@ public class TestDFSXORStripedOutputStream extends TestDFSStripedOutputStream{
 
   @Override
   public ErasureCodingPolicy getEcPolicy() {
-    return ErasureCodingPolicyManager.getPolicyByID(
-        HdfsConstants.XOR_2_1_POLICY_ID);
+    return SystemErasureCodingPolicies.getByID(
+        SystemErasureCodingPolicies.XOR_2_1_POLICY_ID);
   }
 }

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

@@ -17,9 +17,8 @@
  */
 package org.apache.hadoop.hdfs;
 
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
-import org.apache.hadoop.hdfs.protocol.HdfsConstants;
-import org.apache.hadoop.hdfs.server.namenode.ErasureCodingPolicyManager;
 
 /**
  * This tests write operation of DFS striped file with XOR-2-1-64k erasure code
@@ -30,7 +29,7 @@ public class TestDFSXORStripedOutputStreamWithFailure
 
   @Override
   public ErasureCodingPolicy getEcPolicy() {
-    return ErasureCodingPolicyManager.getPolicyByID(
-        HdfsConstants.XOR_2_1_POLICY_ID);
+    return SystemErasureCodingPolicies.getByID(
+        SystemErasureCodingPolicies.XOR_2_1_POLICY_ID);
   }
 }

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

@@ -23,9 +23,9 @@ import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.permission.FsPermission;
 import org.apache.hadoop.hdfs.protocol.DirectoryListing;
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
-import org.apache.hadoop.hdfs.server.namenode.ErasureCodingPolicyManager;
 import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
 import org.apache.hadoop.hdfs.server.namenode.INode;
 import org.apache.hadoop.hdfs.client.HdfsAdmin;
@@ -44,8 +44,8 @@ import org.junit.rules.Timeout;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.security.PrivilegedExceptionAction;
-import java.util.Arrays;
 import java.util.Collection;
+import java.util.List;
 
 import static org.apache.hadoop.test.GenericTestUtils.assertExceptionContains;
 import static org.junit.Assert.*;
@@ -302,12 +302,12 @@ public class TestErasureCodingPolicies {
 
   @Test
   public void testGetErasureCodingPolicy() throws Exception {
-    ErasureCodingPolicy[] sysECPolicies =
-        ErasureCodingPolicyManager.getSystemPolicies();
+    List<ErasureCodingPolicy> sysECPolicies =
+        SystemErasureCodingPolicies.getPolicies();
     assertTrue("System ecPolicies should exist",
-        sysECPolicies.length > 0);
+        sysECPolicies.size() > 0);
 
-    ErasureCodingPolicy usingECPolicy = sysECPolicies[0];
+    ErasureCodingPolicy usingECPolicy = sysECPolicies.get(0);
     String src = "/ec2";
     final Path ecDir = new Path(src);
     fs.mkdir(ecDir, FsPermission.getDirDefault());
@@ -353,12 +353,10 @@ public class TestErasureCodingPolicies {
 
   @Test
   public void testGetAllErasureCodingPolicies() throws Exception {
-    ErasureCodingPolicy[] sysECPolicies = ErasureCodingPolicyManager
-        .getSystemPolicies();
     Collection<ErasureCodingPolicy> allECPolicies = fs
         .getAllErasureCodingPolicies();
     assertTrue("All system policies should be enabled",
-        allECPolicies.containsAll(Arrays.asList(sysECPolicies)));
+        allECPolicies.containsAll(SystemErasureCodingPolicies.getPolicies()));
   }
 
   @Test
@@ -383,9 +381,9 @@ public class TestErasureCodingPolicies {
 
   @Test
   public void testMultiplePoliciesCoExist() throws Exception {
-    ErasureCodingPolicy[] sysPolicies =
-        ErasureCodingPolicyManager.getSystemPolicies();
-    if (sysPolicies.length > 1) {
+    List<ErasureCodingPolicy> sysPolicies =
+        SystemErasureCodingPolicies.getPolicies();
+    if (sysPolicies.size() > 1) {
       for (ErasureCodingPolicy policy : sysPolicies) {
         Path dir = new Path("/policy_" + policy.getId());
         fs.mkdir(dir, FsPermission.getDefault());
@@ -425,8 +423,8 @@ public class TestErasureCodingPolicies {
     Path ecfile = new Path(ecdir, "ecfile");
     fs.setPermission(new Path("/"), new FsPermission((short)0777));
     userfs.mkdirs(ecdir);
-    final String ecPolicyName =
-        ErasureCodingPolicyManager.getSystemPolicies()[0].getName();
+    final String ecPolicyName = StripedFileTestUtil.getDefaultECPolicy()
+        .getName();
     useradmin.setErasureCodingPolicy(ecdir, ecPolicyName);
     assertEquals("Policy not present on dir",
         ecPolicyName,

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

@@ -21,9 +21,8 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
-import org.apache.hadoop.hdfs.protocol.HdfsConstants;
-import org.apache.hadoop.hdfs.server.namenode.ErasureCodingPolicyManager;
 import org.apache.hadoop.io.erasurecode.CodecUtil;
 import org.apache.hadoop.io.erasurecode.ErasureCodeNative;
 import org.apache.hadoop.io.erasurecode.rawcoder.NativeRSRawErasureCoderFactory;
@@ -138,8 +137,8 @@ public class TestUnsetAndChangeDirectoryEcPolicy {
     final Path ec63FilePath = new Path(childDir, "ec_6_3_file");
     final Path ec32FilePath = new Path(childDir, "ec_3_2_file");
     final Path ec63FilePath2 = new Path(childDir, "ec_6_3_file_2");
-    final ErasureCodingPolicy ec32Policy = ErasureCodingPolicyManager
-        .getPolicyByID(HdfsConstants.RS_3_2_POLICY_ID);
+    final ErasureCodingPolicy ec32Policy = SystemErasureCodingPolicies
+        .getByID(SystemErasureCodingPolicies.RS_3_2_POLICY_ID);
 
     fs.mkdirs(parentDir);
     fs.setErasureCodingPolicy(parentDir, ecPolicy.getName());
@@ -236,8 +235,8 @@ public class TestUnsetAndChangeDirectoryEcPolicy {
     final Path rootPath = new Path("/");
     final Path ec63FilePath = new Path(rootPath, "ec_6_3_file");
     final Path ec32FilePath = new Path(rootPath, "ec_3_2_file");
-    final ErasureCodingPolicy ec32Policy = ErasureCodingPolicyManager
-        .getPolicyByID(HdfsConstants.RS_3_2_POLICY_ID);
+    final ErasureCodingPolicy ec32Policy = SystemErasureCodingPolicies
+        .getByID(SystemErasureCodingPolicies.RS_3_2_POLICY_ID);
 
     fs.unsetErasureCodingPolicy(rootPath);
     fs.setErasureCodingPolicy(rootPath, ecPolicy.getName());

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/datanode/TestBlockRecovery.java

@@ -80,7 +80,6 @@ import org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB;
 import org.apache.hadoop.hdfs.server.common.HdfsServerConstants.ReplicaState;
 import org.apache.hadoop.hdfs.server.datanode.BlockRecoveryWorker.BlockRecord;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.ReplicaOutputStreams;
-import org.apache.hadoop.hdfs.server.namenode.ErasureCodingPolicyManager;
 import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
 import org.apache.hadoop.hdfs.server.protocol.BlockRecoveryCommand.RecoveringBlock;
 import org.apache.hadoop.hdfs.server.protocol.BlockRecoveryCommand.RecoveringStripedBlock;
@@ -803,8 +802,7 @@ public class TestBlockRecovery {
   @Test(timeout=60000)
   public void testSafeLength() throws Exception {
     // hard coded policy to work with hard coded test suite
-    ErasureCodingPolicy ecPolicy = ErasureCodingPolicyManager
-        .getSystemPolicies()[0];
+    ErasureCodingPolicy ecPolicy = StripedFileTestUtil.getDefaultECPolicy();
     RecoveringStripedBlock rBlockStriped = new RecoveringStripedBlock(rBlock,
         new byte[9], ecPolicy);
     BlockRecoveryWorker recoveryWorker = new BlockRecoveryWorker(dn);

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

@@ -20,6 +20,7 @@ package org.apache.hadoop.hdfs.server.namenode;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.StripedFileTestUtil;
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
 import org.apache.hadoop.test.GenericTestUtils;
 import org.junit.Assert;
@@ -41,9 +42,6 @@ import static org.junit.Assert.fail;
  */
 public class TestEnabledECPolicies {
 
-  private static final ErasureCodingPolicy[] SYSTEM_POLICIES =
-      ErasureCodingPolicyManager.getSystemPolicies();
-
   @Rule
   public Timeout testTimeout = new Timeout(60000);
 
@@ -112,13 +110,16 @@ public class TestEnabledECPolicies {
     testGetPolicies(enabledPolicies);
 
     // Enable one policy
-    enabledPolicies = new ErasureCodingPolicy[]
-        {SYSTEM_POLICIES[1]};
+    enabledPolicies = new ErasureCodingPolicy[]{
+        SystemErasureCodingPolicies.getPolicies().get(1)
+    };
     testGetPolicies(enabledPolicies);
 
     // Enable two policies
-    enabledPolicies = new ErasureCodingPolicy[]
-        {SYSTEM_POLICIES[1], SYSTEM_POLICIES[2]};
+    enabledPolicies = new ErasureCodingPolicy[]{
+        SystemErasureCodingPolicies.getPolicies().get(1),
+        SystemErasureCodingPolicies.getPolicies().get(2)
+    };
     testGetPolicies(enabledPolicies);
   }
 
@@ -145,7 +146,7 @@ public class TestEnabledECPolicies {
     }
     Assert.assertEquals(enabledPolicies.length, found.size());
     // Check that getEnabledPolicyByName only returns enabled policies
-    for (ErasureCodingPolicy p: SYSTEM_POLICIES) {
+    for (ErasureCodingPolicy p: SystemErasureCodingPolicies.getPolicies()) {
       if (found.contains(p.getName())) {
         // Enabled policy should be present
         Assert.assertNotNull(

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

@@ -35,6 +35,7 @@ import java.util.EnumSet;
 
 import org.apache.hadoop.hdfs.StripedFileTestUtil;
 import org.apache.hadoop.hdfs.protocol.Block;
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
 import org.apache.hadoop.hdfs.protocolPB.PBHelperClient;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo;
@@ -77,8 +78,8 @@ public class TestFSImage {
   private static final String HADOOP_2_7_ZER0_BLOCK_SIZE_TGZ =
       "image-with-zero-block-size.tar.gz";
   private static final ErasureCodingPolicy testECPolicy =
-      ErasureCodingPolicyManager.getPolicyByID(
-          HdfsConstants.RS_10_4_POLICY_ID);
+      SystemErasureCodingPolicies.getByID(
+          SystemErasureCodingPolicies.RS_10_4_POLICY_ID);
 
   @Test
   public void testPersist() throws IOException {
@@ -470,8 +471,8 @@ public class TestFSImage {
       DistributedFileSystem fs = cluster.getFileSystem();
       Path parentDir = new Path("/ec-10-4");
       Path childDir = new Path(parentDir, "ec-3-2");
-      ErasureCodingPolicy ec32Policy = ErasureCodingPolicyManager
-          .getPolicyByID(HdfsConstants.RS_3_2_POLICY_ID);
+      ErasureCodingPolicy ec32Policy = SystemErasureCodingPolicies
+          .getByID(SystemErasureCodingPolicies.RS_3_2_POLICY_ID);
 
       // Create directories and files
       fs.mkdirs(parentDir);
@@ -519,8 +520,8 @@ public class TestFSImage {
       // check the information of file_3_2
       inode = fsn.dir.getINode(file_3_2.toString()).asFile();
       assertTrue(inode.isStriped());
-      assertEquals(ErasureCodingPolicyManager.getPolicyByID(
-          HdfsConstants.RS_3_2_POLICY_ID).getId(),
+      assertEquals(SystemErasureCodingPolicies.getByID(
+          SystemErasureCodingPolicies.RS_3_2_POLICY_ID).getId(),
           inode.getErasureCodingPolicyID());
       blks = inode.getBlocks();
       assertEquals(1, blks.length);

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

@@ -57,6 +57,7 @@ import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.DFSUtilClient;
 import org.apache.hadoop.hdfs.DistributedFileSystem;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
+import org.apache.hadoop.hdfs.StripedFileTestUtil;
 import org.apache.hadoop.hdfs.protocol.DirectoryListing;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.protocol.HdfsFileStatus;
@@ -107,7 +108,9 @@ public class TestINodeFile {
 
   INodeFile createStripedINodeFile(long preferredBlockSize) {
     return new INodeFile(HdfsConstants.GRANDFATHER_INODE_ID, null, perm, 0L, 0L,
-        null, null, HdfsConstants.RS_6_3_POLICY_ID, preferredBlockSize,
+        null, null,
+        StripedFileTestUtil.getDefaultECPolicy().getId(),
+        preferredBlockSize,
         HdfsConstants.WARM_STORAGE_POLICY_ID, STRIPED);
   }
 
@@ -140,7 +143,7 @@ public class TestINodeFile {
     try {
       new INodeFile(HdfsConstants.GRANDFATHER_INODE_ID,
           null, perm, 0L, 0L, null, new Short((short) 3) /*replication*/,
-          HdfsConstants.RS_6_3_POLICY_ID /*ec policy*/,
+          StripedFileTestUtil.getDefaultECPolicy().getId() /*ec policy*/,
           preferredBlockSize, HdfsConstants.WARM_STORAGE_POLICY_ID, CONTIGUOUS);
       fail("INodeFile construction should fail when both replication and " +
           "ECPolicy requested!");

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

@@ -74,14 +74,14 @@ public class TestStripedINodeFile {
 
   // use hard coded policy - see HDFS-9816
   private static final ErasureCodingPolicy testECPolicy
-      = ErasureCodingPolicyManager.getSystemPolicies()[0];
+      = StripedFileTestUtil.getDefaultECPolicy();
 
   @Rule
   public Timeout globalTimeout = new Timeout(300000);
 
   private static INodeFile createStripedINodeFile() {
     return new INodeFile(HdfsConstants.GRANDFATHER_INODE_ID, null, perm, 0L, 0L,
-        null, null, HdfsConstants.RS_6_3_POLICY_ID, 1024L,
+        null, null, StripedFileTestUtil.getDefaultECPolicy().getId(), 1024L,
         HdfsConstants.COLD_STORAGE_POLICY_ID, BlockType.STRIPED);
   }
 
@@ -118,7 +118,7 @@ public class TestStripedINodeFile {
     try {
       new INodeFile(HdfsConstants.GRANDFATHER_INODE_ID,
           null, perm, 0L, 0L, null, new Short((short) 3) /*replication*/,
-          HdfsConstants.RS_6_3_POLICY_ID /*ec policy*/,
+          StripedFileTestUtil.getDefaultECPolicy().getId() /*ec policy*/,
           1024L, HdfsConstants.WARM_STORAGE_POLICY_ID, STRIPED);
       fail("INodeFile construction should fail when both replication and " +
           "ECPolicy requested!");
@@ -147,7 +147,7 @@ public class TestStripedINodeFile {
       LOG.info("Expected exception: ", iae);
     }
 
-    final Byte ecPolicyID = HdfsConstants.RS_6_3_POLICY_ID;
+    final Byte ecPolicyID = StripedFileTestUtil.getDefaultECPolicy().getId();
     try {
       new INodeFile(HdfsConstants.GRANDFATHER_INODE_ID,
           null, perm, 0L, 0L, null, null /*replication*/, ecPolicyID,

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/tools/offlineImageViewer/TestOfflineImageViewer.java

@@ -78,9 +78,8 @@ import org.apache.hadoop.hdfs.DistributedFileSystem;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.protocol.BlockType;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
-import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants.SafeModeAction;
-import org.apache.hadoop.hdfs.server.namenode.ErasureCodingPolicyManager;
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
 import org.apache.hadoop.hdfs.server.namenode.FSImageTestUtil;
 import org.apache.hadoop.hdfs.server.namenode.INodeFile;
 import org.apache.hadoop.hdfs.server.namenode.NameNodeLayoutVersion;
@@ -124,9 +123,8 @@ public class TestOfflineImageViewer {
     tempDir = Files.createTempDir();
     MiniDFSCluster cluster = null;
     try {
-      final ErasureCodingPolicy ecPolicy =
-          ErasureCodingPolicyManager.getPolicyByID(
-              HdfsConstants.XOR_2_1_POLICY_ID);
+      final ErasureCodingPolicy ecPolicy = SystemErasureCodingPolicies
+          .getByID(SystemErasureCodingPolicies.XOR_2_1_POLICY_ID);
 
       Configuration conf = new Configuration();
       conf.setLong(
@@ -412,8 +410,7 @@ public class TestOfflineImageViewer {
             Assert.assertEquals("INode '"
                     + currentInodeName + "' has unexpected EC Policy!",
                 Byte.parseByte(currentECPolicy),
-                ErasureCodingPolicyManager.getPolicyByID(
-                    HdfsConstants.XOR_2_1_POLICY_ID).getId());
+                SystemErasureCodingPolicies.XOR_2_1_POLICY_ID);
             Assert.assertEquals("INode '"
                     + currentInodeName + "' has unexpected replication!",
                 currentRepl,

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/util/TestStripedBlockUtil.java

@@ -21,6 +21,7 @@ package org.apache.hadoop.hdfs.util;
 import com.google.common.base.Preconditions;
 import org.apache.hadoop.fs.StorageType;
 import org.apache.hadoop.hdfs.DFSTestUtil;
+import org.apache.hadoop.hdfs.StripedFileTestUtil;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
@@ -28,7 +29,6 @@ import org.apache.hadoop.hdfs.protocol.LocatedStripedBlock;
 import org.apache.hadoop.hdfs.server.blockmanagement.BlockIdManager;
 import static org.apache.hadoop.hdfs.util.StripedBlockUtil.*;
 
-import org.apache.hadoop.hdfs.server.namenode.ErasureCodingPolicyManager;
 import org.apache.hadoop.hdfs.protocol.ErasureCodingPolicy;
 import org.junit.Before;
 import org.junit.Rule;
@@ -81,7 +81,7 @@ import static org.junit.Assert.assertFalse;
 public class TestStripedBlockUtil {
   // use hard coded policy - see HDFS-9816
   private final ErasureCodingPolicy ecPolicy =
-      ErasureCodingPolicyManager.getSystemPolicies()[0];
+      StripedFileTestUtil.getDefaultECPolicy();
   private final short dataBlocks = (short) ecPolicy.getNumDataUnits();
   private final short parityBlocks = (short) ecPolicy.getNumParityUnits();
   private final short groupSize = (short) (dataBlocks + parityBlocks);

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/web/TestWebHDFS.java

@@ -81,12 +81,12 @@ import org.apache.hadoop.hdfs.TestFileCreation;
 import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
 import org.apache.hadoop.hdfs.protocol.BlockStoragePolicy;
 import org.apache.hadoop.hdfs.protocol.DatanodeInfo;
+import org.apache.hadoop.hdfs.protocol.SystemErasureCodingPolicies;
 import org.apache.hadoop.hdfs.protocol.ExtendedBlock;
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
 import org.apache.hadoop.hdfs.protocol.SnapshottableDirectoryStatus;
-import org.apache.hadoop.hdfs.server.namenode.ErasureCodingPolicyManager;
 import org.apache.hadoop.hdfs.server.namenode.NameNode;
 import org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotTestHelper;
 import org.apache.hadoop.hdfs.server.namenode.web.resources.NamenodeWebHdfsMethods;
@@ -520,8 +520,8 @@ public class TestWebHDFS {
     MiniDFSCluster cluster = null;
     final Configuration conf = WebHdfsTestUtil.createConf();
     conf.set(DFSConfigKeys.DFS_NAMENODE_EC_POLICIES_ENABLED_KEY,
-        ErasureCodingPolicyManager.getPolicyByID(
-            HdfsConstants.XOR_2_1_POLICY_ID).getName());
+        SystemErasureCodingPolicies.getByID(
+            SystemErasureCodingPolicies.XOR_2_1_POLICY_ID).getName());
     try {
       cluster = new MiniDFSCluster.Builder(conf).numDataNodes(3).build();
       cluster.waitActive();
@@ -532,8 +532,8 @@ public class TestWebHDFS {
       final Path ecDir = new Path("/ec");
       dfs.mkdirs(ecDir);
       dfs.setErasureCodingPolicy(ecDir,
-          ErasureCodingPolicyManager.getPolicyByID(
-              HdfsConstants.XOR_2_1_POLICY_ID).getName());
+          SystemErasureCodingPolicies.getByID(
+              SystemErasureCodingPolicies.XOR_2_1_POLICY_ID).getName());
       final Path ecFile = new Path(ecDir, "ec-file.log");
       DFSTestUtil.createFile(dfs, ecFile, 1024 * 10, (short) 1, 0xFEED);