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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7859) Erasure Coding: Persist erasure coding policies in NameNode
Date Wed, 10 May 2017 21:34:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16005479#comment-16005479
] 

Kai Zheng commented on HDFS-7859:
---------------------------------

As there are particular interests and requirements to support more codecs and coders, like
in HDFS-11503; and we received user queries regarding how to try their own EC policies like
using different cell size. So accordingly we want to solve this and make a further step in
HDFS-7337 to support pluggable and configurable codecs. The design doc was updated with latest
discussions and related work, which I hope can address the design level questions that's already
raised or will be raised here. 

[~szetszwo], per your request this should be proceeded with design since it's to change the
fsimage, which is why I want to ping you. Would you let me know if you have any concerns or
would confirm. I know you're very busy with Ozone, so thanks for your time :)!

> Erasure Coding: Persist erasure coding policies 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: SammiChen
>         Attachments: HDFS-7859.001.patch, HDFS-7859.002.patch, HDFS-7859.004.patch, HDFS-7859.005.patch,
HDFS-7859.006.patch, HDFS-7859.007.patch, HDFS-7859.008.patch, HDFS-7859.009.patch, HDFS-7859.010.patch,
HDFS-7859-HDFS-7285.002.patch, HDFS-7859-HDFS-7285.002.patch, HDFS-7859-HDFS-7285.003.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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