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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7839) Erasure coding: implement facilities in NameNode to create and manage EC zones
Date Wed, 01 Apr 2015 20:34:57 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14391396#comment-14391396
] 

Jing Zhao commented on HDFS-7839:
---------------------------------

Thanks for working on this, Zhe! The patch looks good to me. Some minor comments:
# The change of log4j.properties can be removed
# Should we disallow setting root as an EC zone?
# I think we can first disallow nested EC zone
# {{getECPolicy}} can take INodesInPath as its parameter.
# We need more unit tests to cover all the zone creation scenarios. Also we need to test all
the restrictions defined by the zone. Also need to make sure file creation and block allocation
recognize the zone (this part may have been covered by existing tests).


> Erasure coding: implement facilities in NameNode to create and manage EC zones
> ------------------------------------------------------------------------------
>
>                 Key: HDFS-7839
>                 URL: https://issues.apache.org/jira/browse/HDFS-7839
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>         Attachments: HDFS-7839-000.patch, HDFS-7839-001.patch, HDFS-7839-002.patch
>
>
> As a quick first step to facilitate initial development and testing, HDFS-7347 added
EC configuration in file header as one storage policy. We have discussed and [concluded |https://issues.apache.org/jira/browse/HDFS-7285?focusedCommentId=14296210&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14296210]
that EC configurations should be part of XAttr. This JIRA aims to add the basic EC XAttr structure.
HDFS-7337 will add configurable and pluggable schema info.
> This JIRA will follow the [plan | https://issues.apache.org/jira/browse/HDFS-7285?focusedCommentId=14370307&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14370307]
we made under HDFS-7285.



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