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https://issues.apache.org/jira/browse/HDFS-8833?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhe Zhang updated HDFS-8833:
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Attachment: HDFS-8833-HDFS-7285.04.patch
Thanks Rakesh for the comment! Actually we are all in sync w.r.t the design,
including the non-empty dir policy.
So I'm still waiting for Jenkins to verify my latest 'git merge'. While waiting
I created the 04 patch based on the merged local branch. In case anyone wants
to review the patch before I update the main feature branch, please use my
personal github [repo | https://github.com/zhe-thoughts/hadoop/tree/HDFS-7285].
The new patch fixes the test issue Rakesh pointed out. It also reflects
Walter's comment to avoid renaming {{isStriped}} bit in the file header. We
probly should keep the bit and reuse the {{REPLICATION}} bits anyway, as I
proposed above.
> Erasure coding: store EC schema and cell size in INodeFile and eliminate
> notion of EC zones
> -------------------------------------------------------------------------------------------
>
> Key: HDFS-8833
> URL: https://issues.apache.org/jira/browse/HDFS-8833
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: HDFS-7285
> Reporter: Zhe Zhang
> Assignee: Zhe Zhang
> Attachments: HDFS-8833-HDFS-7285-merge.00.patch,
> HDFS-8833-HDFS-7285-merge.01.patch, HDFS-8833-HDFS-7285.02.patch,
> HDFS-8833-HDFS-7285.03.patch, HDFS-8833-HDFS-7285.04.patch
>
>
> We have [discussed |
> https://issues.apache.org/jira/browse/HDFS-7285?focusedCommentId=14357754&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14357754]
> storing EC schema with files instead of EC zones and recently revisited the
> discussion under HDFS-8059.
> As a recap, the _zone_ concept has severe limitations including renaming and
> nested configuration. Those limitations are valid in encryption for security
> reasons and it doesn't make sense to carry them over in EC.
> This JIRA aims to store EC schema and cell size on {{INodeFile}} level. For
> simplicity, we should first implement it as an xattr and consider memory
> optimizations (such as moving it to file header) as a follow-on. We should
> also disable changing EC policy on a non-empty file / dir in the first phase.
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