Andrew Wang commented on HADOOP-13061:

Somewhat unrelated question related to rs-legacy: it's from the Facebook 
HDFS-RAID implementation right? My recollection is that we added rs-legacy to 
support migration from HDFS-RAID to the HDFS-7285 implementation without 

However, as it is right now, that zero-copy migration is not possible. 
HDFS-RAID is not striped, it's at the block level. Also, HDFS-RAID combines an 
entire directory of files, whereas HDFS-7285 is on a single file. So, I don't 
think we can natively handle HDFS-RAID files without a lot more work.

[~drankye], if this is accurate, do you think it's still worth keeping the 
rs-legacy codec around?

> Refactor erasure coders
> -----------------------
>                 Key: HADOOP-13061
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13061
>             Project: Hadoop Common
>          Issue Type: Sub-task
>            Reporter: Rui Li
>            Assignee: Kai Sasaki
>              Labels: hdfs-ec-3.0-must-do
>         Attachments: HADOOP-13061.01.patch, HADOOP-13061.02.patch, 
> HADOOP-13061.03.patch, HADOOP-13061.04.patch, HADOOP-13061.05.patch, 
> HADOOP-13061.06.patch, HADOOP-13061.07.patch, HADOOP-13061.08.patch, 
> HADOOP-13061.09.patch, HADOOP-13061.10.patch, HADOOP-13061.11.patch, 
> HADOOP-13061.12.patch, HADOOP-13061.13.patch, HADOOP-13061.14.patch, 
> HADOOP-13061.15.patch, HADOOP-13061.16.patch

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