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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:
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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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