Wei-Chiu Chuang commented on HADOOP-11798:

In addition to HDFSErasureCoding.md you should also add the configuration 
key/value/description to core-default.xml.

You may also consider adding the same information for 
io.erasurecode.codec.rs-default.rawcoder and 

> Native raw erasure coder in XOR codes
> -------------------------------------
>                 Key: HADOOP-11798
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11798
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: io
>            Reporter: Kai Zheng
>            Assignee: SammiChen
>              Labels: hdfs-ec-3.0-must-do
>             Fix For: HDFS-7285
>         Attachments: HADOOP-11798-v1.patch, HADOOP-11798-v2.patch, 
> HADOOP-11798-v3.patch, HADOOP-11798-v4.patch
> Raw XOR coder is utilized in Reed-Solomon erasure coder in an optimization to 
> recover only one erased block which is in most often case. It can also be 
> used in HitchHiker coder. Therefore a native implementation of it would be 
> deserved for performance gain.

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