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https://issues.apache.org/jira/browse/HADOOP-12924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15207952#comment-15207952
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Zhe Zhang commented on HADOOP-12924:
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Technically, any coder that yields new numerical results should be a new
policy. Therefore both the dummy coder and the legacy / HDFS-RAID RS coder
should have their own policies.
[~drankye] I think the bottomline is that the file metadata (stored in the
header) should present HDFS-RAID and the new Java RS coder differently.
Otherwise a reader won't be able to correctly decode the data. I think we
should just create a new policy for HDFS-RAID coder (and one for the dummy
coder). The concept of Reed-Solomon / {{RS}} is actually very broad. Strictly
speaking XOR is also a special case of RS. So I think our
{{ErasureCodingPolicy}} (and the name of each policy) should be explicit about
what type of RS is being used.
> Add default coder key for creating raw coders
> ---------------------------------------------
>
> Key: HADOOP-12924
> URL: https://issues.apache.org/jira/browse/HADOOP-12924
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Rui Li
> Assignee: Rui Li
> Priority: Minor
> Attachments: HADOOP-12924.1.patch
>
>
> As suggested
> [here|https://issues.apache.org/jira/browse/HADOOP-12826?focusedCommentId=15194402&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15194402].
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