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Date: Sat, 8 Oct 2016 01:23:20 +0000 (UTC)
From: "Kai Zheng (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-10971) Distcp should not copy replication
 factor if source file is erasure coded
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archived-at: Sat, 08 Oct 2016 01:23:22 -0000


    [ https://issues.apache.org/jira/browse/HDFS-10971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15556868#comment-15556868 ] 

Kai Zheng commented on HDFS-10971:
----------------------------------

Sounds good to me, Andrew and Zhe.

So for this issue, the replication factor should be still copied or handled accordingly when source file is striped and/or the dest file is to be striped.

> Distcp should not copy replication factor if source file is erasure coded
> -------------------------------------------------------------------------
>
>                 Key: HDFS-10971
>                 URL: https://issues.apache.org/jira/browse/HDFS-10971
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: distcp
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Wei-Chiu Chuang
>            Assignee: Wei-Chiu Chuang
>              Labels: hdfs-ec-3.0-must-do
>         Attachments: HDFS-10971.testcase.patch
>
>
> The current erasure coding implementation uses replication factor field to store erasure coding policy.
> Distcp copies the source file's replication factor to the destination if {{-pr}} is specified. However, if the source file is EC, the replication factor (which is EC policy) should not be replicated to the destination file. When a HdfsFileStatus is converted to FileStatus, the replication factor is set to 0 if it's an EC file.
> In fact, I will attach a test case that shows trying to replicate the replication factor of an EC file results in an IOException: "Requested replication factor of 0 is less than the required minimum of 1 for /tmp/dst/dest2"


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