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https://issues.apache.org/jira/browse/HADOOP-13061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15567172#comment-15567172
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Andrew Wang commented on HADOOP-13061:
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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
copying.
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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