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https://issues.apache.org/jira/browse/HADOOP-3822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12616549#action_12616549
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Doug Cutting commented on HADOOP-3822:
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There's public and there's public. I'm not sure we're yet ready for this to
appear in the user javadocs, but making it easier for developers to experiment
is fine. The published javadoc is the API that we're promising to keep
back-compatible, and we should expand it only cautiously. As we restructure
the code, we should create a new classification we didn't have before: public
but not in javadoc. This includes most of the hdfs and mapred daemon
implementations. And the scheduler API belongs there for now.
> Create a public scheduler API
> -----------------------------
>
> Key: HADOOP-3822
> URL: https://issues.apache.org/jira/browse/HADOOP-3822
> Project: Hadoop Core
> Issue Type: Improvement
> Components: mapred
> Reporter: Tom White
> Fix For: 0.19.0
>
> Attachments: hadoop-3822.patch, hadoop-3822.sh
>
>
> The work in HADOOP-3412 provided an API to support pluggable schedulers.
> However implementations have to be in the org.apache.hadoop.mapred package,
> which is undesirable. The goal of this issue is to create a public API for
> scheduler writers to code against.
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