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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11840) ECSchema are considered as not equal even if they are logically equal
Date Wed, 22 Apr 2015 21:11:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14507902#comment-14507902
] 

Kai Zheng commented on HADOOP-11840:
------------------------------------

This will follow on HDFS-8156 when supporting multiple schemas.

Copied some discussion from HDFS-8156 with [~szetszwo]:
{quote}
    > Could two schemas having the same name but different set of logical parameters?
    We should avoid such schemas in a system. Will update the document reflecting this thought.
    > Should two schemas having the same set of logical parameters but different names
be considered the same?
    We should also avoid such schemas. Will update the document reflecting this thought.
{quote}

> ECSchema are considered as not equal even if they are logically equal
> ---------------------------------------------------------------------
>
>                 Key: HADOOP-11840
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11840
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: io
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Kai Zheng
>
> For example, a schema could have an empty options and another schema has all the fields
are the same except that options has NUM_DATA_UNITS_KEY => numDataUnits.  Then, these two
schemas are considered as not equal.



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