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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8833) Erasure coding: store EC schema and cell size in INodeFile and eliminate notion of EC zones
Date Thu, 10 Sep 2015 06:14:46 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8833?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zhe Zhang updated HDFS-8833:
----------------------------
       Resolution: Fixed
     Hadoop Flags: Reviewed
    Fix Version/s: HDFS-7285
           Status: Resolved  (was: Patch Available)

Thanks Walter for reviewing the test change! We also finally got a meaningful Jenkins run.
The failed and timeout tests in the report all pass fine locally. I just committed the 08
patch to the feature branch.

Thanks [~andrew.wang], [~jingzhao], [~walter.k.su], [~vinayrpet], [~szetszwo], and [~rakeshr]
for the helpful discussion. Many thanks to [~drankye] and [~lirui] for testing the patch.

> 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
>             Fix For: HDFS-7285
>
>         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,
HDFS-8833-HDFS-7285.05.patch, HDFS-8833-HDFS-7285.06.patch, HDFS-8833-HDFS-7285.07.patch,
HDFS-8833-HDFS-7285.08.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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