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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 02:27:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14495560#comment-14495560
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Kai Zheng commented on HDFS-7859:
---------------------------------

bq.How can we be sure that the schema object format won't change?
Good question. In {{ECSchema}} class, in addition to the common parameters widely used by
typical erasure codecs, an {{options}} map is also included so potentially any complex codec
can use it to contain its own specific parameters or key-value pairs, such parameters are
subject to its corresponding erasure coders to interpret. We try to make it flexible enough
to avoid such change, but in case it needs change anyway, I thought it's supported, I mean
the image layout version.

> 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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