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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7859) Erasure Coding: Persist EC schemas in NameNode
Date Wed, 15 Apr 2015 01:20:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14495517#comment-14495517
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Kai Zheng commented on HDFS-7859:
---------------------------------

bq.we don't know what to persist. For example, should we persist schema ID? We are not able
to answer this question since we don't even know if a schema should have an ID.
It's not true. We have {{ECSchema}} defined and it uses schema name for the ID purpose. We
would persist the whole schema object. The on-going work although isn't reflected in the design
doc but we did do that following our related discussion. In the meetup with [~zhz] and [~jingzhao],
we covered this aspect and even your questions already. It's my mistake I didn't put it down
clearly and update the doc accordingly. 

> Erasure Coding: Persist EC schemas in NameNode
> ----------------------------------------------
>
>                 Key: HDFS-7859
>                 URL: https://issues.apache.org/jira/browse/HDFS-7859
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Kai Zheng
>            Assignee: Xinwei Qin 
>         Attachments: HDFS-7859.001.patch
>
>
> In meetup discussion with [~zhz] and [~jingzhao], it's suggested that we persist EC schemas
in NameNode centrally and reliably, so that EC zones can reference them by name efficiently.



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