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Posted to common-commits@hadoop.apache.org by ka...@apache.org on 2016/10/26 18:30:35 UTC
[09/50] [abbrv] hadoop git commit: HDFS-11033. Add documents for
native raw erasure coder in XOR codes. Contributed by SammiChen.
HDFS-11033. Add documents for native raw erasure coder in XOR codes. Contributed by SammiChen.
Project: http://git-wip-us.apache.org/repos/asf/hadoop/repo
Commit: http://git-wip-us.apache.org/repos/asf/hadoop/commit/25438526
Tree: http://git-wip-us.apache.org/repos/asf/hadoop/tree/25438526
Diff: http://git-wip-us.apache.org/repos/asf/hadoop/diff/25438526
Branch: refs/heads/YARN-4752
Commit: 25438526edd6b3fef23daddd29facfca8f840913
Parents: df857f0
Author: Wei-Chiu Chuang <we...@apache.org>
Authored: Fri Oct 21 16:20:07 2016 -0700
Committer: Wei-Chiu Chuang <we...@apache.org>
Committed: Fri Oct 21 16:20:07 2016 -0700
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.../src/main/resources/core-default.xml | 22 +++++++++++++++++++-
.../src/site/markdown/HDFSErasureCoding.md | 4 +++-
2 files changed, 24 insertions(+), 2 deletions(-)
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http://git-wip-us.apache.org/repos/asf/hadoop/blob/25438526/hadoop-common-project/hadoop-common/src/main/resources/core-default.xml
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diff --git a/hadoop-common-project/hadoop-common/src/main/resources/core-default.xml b/hadoop-common-project/hadoop-common/src/main/resources/core-default.xml
index daa421c..59d939b 100644
--- a/hadoop-common-project/hadoop-common/src/main/resources/core-default.xml
+++ b/hadoop-common-project/hadoop-common/src/main/resources/core-default.xml
@@ -647,7 +647,27 @@
<name>io.erasurecode.codec.rs-default.rawcoder</name>
<value>org.apache.hadoop.io.erasurecode.rawcoder.RSRawErasureCoderFactory</value>
<description>
- Raw coder implementation for the rs-default codec.
+ Raw coder implementation for the rs-default codec. The default value is a
+ pure Java implementation. There is also a native implementation. Its value
+ is org.apache.hadoop.io.erasurecode.rawcoder.NativeRSRawErasureCoderFactory.
+ </description>
+</property>
+
+<property>
+ <name>io.erasurecode.codec.rs-legacy.rawcoder</name>
+ <value>org.apache.hadoop.io.erasurecode.rawcoder.RSRawErasureCoderFactoryLegacy</value>
+ <description>
+ Raw coder implementation for the rs-legacy codec.
+ </description>
+</property>
+
+<property>
+ <name>io.erasurecode.codec.xor.rawcoder</name>
+ <value>org.apache.hadoop.io.erasurecode.rawcoder.XORRawErasureCoderFactory</value>
+ <description>
+ Raw coder implementation for the xor codec. The default value is a pure Java
+ implementation. There is also a native implementation. Its value is
+ org.apache.hadoop.io.erasurecode.rawcoder.NativeXORRawErasureCoderFactory.
</description>
</property>
http://git-wip-us.apache.org/repos/asf/hadoop/blob/25438526/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSErasureCoding.md
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diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSErasureCoding.md b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSErasureCoding.md
index 627260f..9119b1e 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSErasureCoding.md
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HDFSErasureCoding.md
@@ -102,7 +102,7 @@ Deployment
`io.erasurecode.codec.rs-default.rawcoder` for the default RS codec,
`io.erasurecode.codec.rs-legacy.rawcoder` for the legacy RS codec,
`io.erasurecode.codec.xor.rawcoder` for the XOR codec.
- The default implementations for all of these codecs are pure Java. For default RS codec, there is also a native implementation which leverages Intel ISA-L library to improve the encoding and decoding calculation. Please refer to section "Enable Intel ISA-L" for more detail information.
+ The default implementations for all of these codecs are pure Java. For default RS codec, there is also a native implementation which leverages Intel ISA-L library to improve the performance of codec. For XOR codec, a native implementation which leverages Intel ISA-L library to improve the performance of codec is also supported. Please refer to section "Enable Intel ISA-L" for more detail information.
Erasure coding background recovery work on the DataNodes can also be tuned via the following configuration parameters:
@@ -119,6 +119,8 @@ Deployment
To check ISA-L library enable state, try "Hadoop checknative" command. It will tell you if ISA-L library is enabled or not.
+ It also requires three steps to enable the native implementation of XOR codec. The first two steps are the same as the above step 1 and step 2. In step 3, configure the `io.erasurecode.codec.xor.rawcoder` key with `org.apache.hadoop.io.erasurecode.rawcoder.NativeXORRawErasureCoderFactory` on both HDFS client and DataNodes.
+
### Administrative commands
HDFS provides an `erasurecode` subcommand to perform administrative commands related to erasure coding.
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