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https://issues.apache.org/jira/browse/HADOOP-13200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15950354#comment-15950354
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Kai Zheng commented on HADOOP-13200:
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Hi Andrew,
Thanks for your thoughts! I guess I roughly catch your points, so try to align
with yours:
1. How about for the raw coder factory registry we use {{ServiceLoader}}
pattern? Say each raw coder factory will be picked up from class loaders by the
loader. All the loaded raw coder factories will be populated into the singleton
registry.
2. Assume each raw coder factory contributes to a codec, and the codec name can
be determined by {{RawCoderFactory->getCodecName()}}, so the mapping between
codec and its implemented raw coder factories can be determined while
initialization phase.
3. Considering a codec can have multiple raw coder factories and users may want
to specify the priority list, how about each raw coder or its factory is
assigned a unique name? The name can be determined by
{{RawCoderFactory->getName()}}. The name can be used in the priority list.
> Seeking a better approach allowing to customize and configure erasure coders
> ----------------------------------------------------------------------------
>
> Key: HADOOP-13200
> URL: https://issues.apache.org/jira/browse/HADOOP-13200
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Kai Zheng
> Assignee: Kai Zheng
> Priority: Blocker
> Labels: hdfs-ec-3.0-must-do
>
> This is a follow-on task for HADOOP-13010 as discussed over there. There may
> be some better approach allowing to customize and configure erasure coders
> than the current having raw coder factory, as [~cmccabe] suggested. Will copy
> the relevant comments here to continue the discussion.
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