HDFS-11172. Support an erasure coding policy using RS 10 + 4. Contributed by Wei Zhou.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/ErasureCodeConstants.java

@@ -41,4 +41,7 @@ public final class ErasureCodeConstants {
 
   public static final ECSchema XOR_2_1_SCHEMA = new ECSchema(
       XOR_CODEC_NAME, 2, 1);
+
+  public static final ECSchema RS_10_4_SCHEMA = new ECSchema(
+      RS_DEFAULT_CODEC_NAME, 10, 4);
 }

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

@@ -148,6 +148,7 @@ public final class HdfsConstants {
   public static final byte RS_3_2_POLICY_ID = 1;
   public static final byte RS_6_3_LEGACY_POLICY_ID = 2;
   public static final byte XOR_2_1_POLICY_ID = 3;
+  public static final byte RS_10_4_POLICY_ID = 4;
 
   /* Hidden constructor */
   protected HdfsConstants() {

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

@@ -51,11 +51,14 @@ public final class ErasureCodingPolicyManager {
   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_POLICY4, SYS_POLICY5};
 
   // Supported storage policies for striped EC files
   private static final byte[] SUITABLE_STORAGE_POLICIES_FOR_EC_STRIPED_MODE = new byte[] {

hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSErasureCoding.md

@@ -72,7 +72,7 @@ Architecture
 
       2. _The size of a striping cell._ This determines the granularity of striped reads and writes, including buffer sizes and encoding work.
 
-    There are three policies currently being supported: RS-DEFAULT-3-2-64k, RS-DEFAULT-6-3-64k and RS-LEGACY-6-3-64k. All with default cell size of 64KB. The system default policy is RS-DEFAULT-6-3-64k which use the default schema RS_6_3_SCHEMA with a cell size of 64KB.
+    There are four policies currently being supported: RS-DEFAULT-3-2-64k, RS-DEFAULT-6-3-64k, RS-DEFAULT-10-4-64k and RS-LEGACY-6-3-64k. All with default cell size of 64KB. The system default policy is RS-DEFAULT-6-3-64k which use the default schema RS_6_3_SCHEMA with a cell size of 64KB.
 
  *  **Intel ISA-L**
     Intel ISA-L stands for Intel Intelligent Storage Acceleration Library. ISA-L is a collection of optimized low-level functions used primarily in storage applications. It includes a fast block Reed-Solomon type erasure codes optimized for Intel AVX and AVX2 instruction sets.

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

@@ -0,0 +1,35 @@
+/**
+ * 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;
+
+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-DEFAULT-10-4-64k
+ *  erasure code policy.
+ */
+public class TestDFSRSDefault10x4StripedInputStream extends
+    TestDFSStripedInputStream {
+
+  public ErasureCodingPolicy getEcPolicy() {
+    return ErasureCodingPolicyManager.getPolicyByPolicyID(
+        HdfsConstants.RS_10_4_POLICY_ID);
+  }
+}

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

@@ -0,0 +1,36 @@
+/**
+ * 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;
+
+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-DEFAULT-10-4-64k
+ *  erasure code policy.
+ */
+public class TestDFSRSDefault10x4StripedOutputStream
+    extends TestDFSStripedOutputStream {
+
+  @Override
+  public ErasureCodingPolicy getEcPolicy() {
+    return ErasureCodingPolicyManager.getPolicyByPolicyID(
+        HdfsConstants.RS_10_4_POLICY_ID);
+  }
+}

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

@@ -0,0 +1,36 @@
+/**
+ * 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;
+
+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-DEFAULT-10-4-64k
+ *  erasure code policy under Datanode failure conditions.
+ */
+public class TestDFSRSDefault10x4StripedOutputStreamWithFailure
+    extends TestDFSStripedOutputStreamWithFailure {
+
+  @Override
+  public ErasureCodingPolicy getEcPolicy() {
+    return ErasureCodingPolicyManager.getPolicyByPolicyID(
+        HdfsConstants.RS_10_4_POLICY_ID);
+  }
+}