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

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This commit is contained in:
Andrew Wang 2016-12-06 12:49:38 -08:00
parent 79d90b810c
commit f53b481ffe
7 changed files with 116 additions and 2 deletions
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3
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/ErasureCodeConstants.java
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@ -41,4 +41,7 @@ private 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);
}

1
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/HdfsConstants.java
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@ -148,6 +148,7 @@ public enum DatanodeReportType {
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() {

5
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ErasureCodingPolicyManager.java
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@ -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[] {

2
hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSErasureCoding.md
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@ -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.

35
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSRSDefault10x4StripedInputStream.java Normal file
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@ -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);
}
}

36
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSRSDefault10x4StripedOutputStream.java Normal file
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@ -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);
}
}

36
hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSRSDefault10x4StripedOutputStreamWithFailure.java Normal file
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@ -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);
}
}