SammiChen commented on HADOOP-11798:

Hi Wei-Chiu, thank you so much for reviewing the code! Talking about 
documentation, one thing comes to my mind is we can add notes in 
HDFSErasureCoding.md, use different values of key 
"io.erasurecode.codec.xor.rawcoder" to switch between native v.s. Java-based 
If only HDFSErasureCoding.md need to be updated, I will upload a new patch 
including this document update later. 

> 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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