You are viewing a plain text version of this content. The canonical link for it is here.
Posted to common-commits@hadoop.apache.org by zh...@apache.org on 2015/05/04 19:57:43 UTC
[09/50] hadoop git commit: HDFS-8074 Define a system-wide default EC
schema. Contributed by Kai Zheng
HDFS-8074 Define a system-wide default EC schema. Contributed by Kai Zheng
Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/3e4c3dd6
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/3e4c3dd6
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/3e4c3dd6
Branch: refs/heads/HDFS-7285
Commit: 3e4c3dd6e25a7590119f2884aed024042402fd8c
Parents: 736202e
Author: Kai Zheng <ka...@intel.com>
Authored: Thu Apr 9 01:30:02 2015 +0800
Committer: Zhe Zhang <zh...@apache.org>
Committed: Mon May 4 10:13:07 2015 -0700
----------------------------------------------------------------------
.../src/main/conf/ecschema-def.xml | 5 --
.../apache/hadoop/io/erasurecode/ECSchema.java | 57 +++++++++++++++++-
.../hadoop-hdfs/CHANGES-HDFS-EC-7285.txt | 4 +-
.../hdfs/server/namenode/ECSchemaManager.java | 62 ++++++++++++++++++++
4 files changed, 120 insertions(+), 8 deletions(-)
----------------------------------------------------------------------
http://git-wip-us.apache.org/repos/asf/hadoop/blob/3e4c3dd6/hadoop-common-project/hadoop-common/src/main/conf/ecschema-def.xml
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/conf/ecschema-def.xml b/hadoop-common-project/hadoop-common/src/main/conf/ecschema-def.xml
index e619485..e36d386 100644
--- a/hadoop-common-project/hadoop-common/src/main/conf/ecschema-def.xml
+++ b/hadoop-common-project/hadoop-common/src/main/conf/ecschema-def.xml
@@ -27,11 +27,6 @@ You can modify and remove those not used yet, or add new ones.
-->
<schemas>
- <schema name="RS-6-3">
- <k>6</k>
- <m>3</m>
- <codec>RS</codec>
- </schema>
<schema name="RS-10-4">
<k>10</k>
<m>4</m>
http://git-wip-us.apache.org/repos/asf/hadoop/blob/3e4c3dd6/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/ECSchema.java
----------------------------------------------------------------------
diff --git a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/ECSchema.java b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/ECSchema.java
index 27be00e..8c3310e 100644
--- a/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/ECSchema.java
+++ b/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/ECSchema.java
@@ -23,12 +23,12 @@ import java.util.Map;
/**
* Erasure coding schema to housekeeper relevant information.
*/
-public class ECSchema {
+public final class ECSchema {
public static final String NUM_DATA_UNITS_KEY = "k";
public static final String NUM_PARITY_UNITS_KEY = "m";
public static final String CODEC_NAME_KEY = "codec";
public static final String CHUNK_SIZE_KEY = "chunkSize";
- public static final int DEFAULT_CHUNK_SIZE = 64 * 1024; // 64K
+ public static final int DEFAULT_CHUNK_SIZE = 256 * 1024; // 256K
private String schemaName;
private String codecName;
@@ -82,6 +82,18 @@ public class ECSchema {
}
/**
+ * Constructor with key parameters provided.
+ * @param schemaName
+ * @param codecName
+ * @param numDataUnits
+ * @param numParityUnits
+ */
+ public ECSchema(String schemaName, String codecName,
+ int numDataUnits, int numParityUnits) {
+ this(schemaName, codecName, numDataUnits, numParityUnits, null);
+ }
+
+ /**
* Constructor with key parameters provided. Note the options may contain
* additional information for the erasure codec to interpret further.
* @param schemaName
@@ -200,4 +212,45 @@ public class ECSchema {
return sb.toString();
}
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) {
+ return true;
+ }
+ if (o == null || getClass() != o.getClass()) {
+ return false;
+ }
+
+ ECSchema ecSchema = (ECSchema) o;
+
+ if (numDataUnits != ecSchema.numDataUnits) {
+ return false;
+ }
+ if (numParityUnits != ecSchema.numParityUnits) {
+ return false;
+ }
+ if (chunkSize != ecSchema.chunkSize) {
+ return false;
+ }
+ if (!schemaName.equals(ecSchema.schemaName)) {
+ return false;
+ }
+ if (!codecName.equals(ecSchema.codecName)) {
+ return false;
+ }
+ return options.equals(ecSchema.options);
+ }
+
+ @Override
+ public int hashCode() {
+ int result = schemaName.hashCode();
+ result = 31 * result + codecName.hashCode();
+ result = 31 * result + options.hashCode();
+ result = 31 * result + numDataUnits;
+ result = 31 * result + numParityUnits;
+ result = 31 * result + chunkSize;
+
+ return result;
+ }
}
http://git-wip-us.apache.org/repos/asf/hadoop/blob/3e4c3dd6/hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt
index 7423033..5078a15 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt
@@ -52,4 +52,6 @@
manage EC zones (Zhe Zhang)
HDFS-8023. Erasure Coding: retrieve eraure coding schema for a file from
- NameNode (vinayakumarb)
\ No newline at end of file
+ NameNode (vinayakumarb)
+
+ HDFS-8074. Define a system-wide default EC schema. (Kai Zheng)
\ No newline at end of file
http://git-wip-us.apache.org/repos/asf/hadoop/blob/3e4c3dd6/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ECSchemaManager.java
----------------------------------------------------------------------
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ECSchemaManager.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ECSchemaManager.java
new file mode 100644
index 0000000..b001c57
--- /dev/null
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ECSchemaManager.java
@@ -0,0 +1,62 @@
+/**
+ * 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 org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.io.erasurecode.ECSchema;
+
+/**
+ * This manages EC schemas predefined and activated in the system. It loads from
+ * predefined ones in XML and syncs with persisted ones in NameNode image.
+ *
+ * This class is instantiated by the FSNamesystem.
+ */
+@InterfaceAudience.LimitedPrivate({"HDFS"})
+public final class ECSchemaManager {
+
+ private static final int DEFAULT_DATA_BLOCKS = 6;
+ private static final int DEFAULT_PARITY_BLOCKS = 3;
+ private static final String DEFAULT_CODEC_NAME = "rs";
+ private static final String DEFAULT_SCHEMA_NAME = "SYS-DEFAULT-RS-6-3";
+
+ private static ECSchema SYS_DEFAULT_SCHEMA = new ECSchema(DEFAULT_SCHEMA_NAME,
+ DEFAULT_CODEC_NAME, DEFAULT_DATA_BLOCKS, DEFAULT_PARITY_BLOCKS);
+
+ /**
+ * Get system-wide default EC schema, which can be used by default when no
+ * schema is specified for an EC zone.
+ * @return schema
+ */
+ public static ECSchema getSystemDefaultSchema() {
+ return SYS_DEFAULT_SCHEMA;
+ }
+
+ /**
+ * Tell the specified schema is the system default one or not.
+ * @param schema
+ * @return true if it's the default false otherwise
+ */
+ public static boolean isSystemDefault(ECSchema schema) {
+ if (schema == null) {
+ throw new IllegalArgumentException("Invalid schema parameter");
+ }
+
+ // schema name is the identifier, but for safety we check all properties.
+ return SYS_DEFAULT_SCHEMA.equals(schema);
+ }
+}