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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8156) Define some system schemas in codes
Date Thu, 16 Apr 2015 22:11:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14498838#comment-14498838
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Kai Zheng commented on HDFS-8156:
---------------------------------

Thanks [~szetszwo] for the comments!
bq.Adding another schema complicate the testing.
I agree. I thought we're not late and I would take to get more complicated tests. Maybe you
could elaborate a little bit for the concrete job? What concerned me is if we don't have at
least two schemas, it's hard to tell a schema is actually corrected used across the whole
system, client, namenode and datanode. Two schemas allow to expose some tricky things. On
the other hand, having a schema support in hand, it won't take too much to support the other
one. As the new schema is defined in Java codes as discussed with [~zhz] and you in HDFS-7859,
I thought it removes the overhead or concern related to the customization XML. I wish this
would sound OK for you at this point. Thanks. Note RS-10-4 is originated from the deployment
experience in FB.
bq.It is better to use RS-6-3 instead of SYS-DEFAULT-RS-6-3 so that the default schema can
be changed later on.
Totally agree, will do that. A good point! 

Thanks again.


> 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
>
>
> 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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