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https://issues.apache.org/jira/browse/HDFS-8156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14499174#comment-14499174
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Kai Zheng commented on HDFS-8156:
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bq.As I said before, just one schema would not expose some tricky issues.
May I clarify this a little bit. In the current codes there're still many
places using the hard-coded values defined in {{HdfsConstants}}, which are to
be done in HDFS-8062. I mean, if during the process there're some missings,
then it's not easy to tell whether all the codes are using the system default
schema. Having the other schema as illustrated here incurs little overhead but
allows to perform more tests to see if we're really using schema object
consistently.
> Define some system schemas in codes
> -----------------------------------
>
> Key: HDFS-8156
> URL: https://issues.apache.org/jira/browse/HDFS-8156
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Kai Zheng
> Assignee: Kai Zheng
> Attachments: HDFS-8156-v1.patch, HDFS-8156-v2.patch
>
>
> This is to define and add some system schemas in codes, and also resolve some
> TODOs left for HDFS-7859 and HDFS-7866 as they're still subject to further
> discussion.
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