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Posted to common-issues@hadoop.apache.org by "Andrew Wang (JIRA)" <ji...@apache.org> on 2017/04/04 22:27:41 UTC
[jira] [Commented] (HADOOP-14254) Add a Distcp option to preserve
Erasure Coding attributes
[ https://issues.apache.org/jira/browse/HADOOP-14254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15955980#comment-15955980 ]
Andrew Wang commented on HADOOP-14254:
--------------------------------------
I think the priority for this one isn't that high. These policies can be cluster specific, and normally we expect the admin to set up these policies beforehand.
> Add a Distcp option to preserve Erasure Coding attributes
> ---------------------------------------------------------
>
> Key: HADOOP-14254
> URL: https://issues.apache.org/jira/browse/HADOOP-14254
> Project: Hadoop Common
> Issue Type: Improvement
> Components: tools/distcp
> Affects Versions: 3.0.0-alpha3
> Reporter: Wei-Chiu Chuang
> Attachments: HADOOP-14254.test.patch, HDFS-11472.001.patch
>
>
> Currently Distcp does not preserve the erasure coding attributes properly. I propose we add a "-pe" switch to ensure erasure coded files at source are copied as erasure coded files at destination.
> For example, if the src cluster has the following directories and files that are copied to dest cluster
> hdfs://src/ root directory is replicated
> hdfs://src/foo erasure code enabled directory
> hdfs://src/foo/bar erasure coded file
> after distcp, hdfs://dest/foo and hdfs://dest/foo/bar will not be erasure coded.
> It may be useful to add such capability. One potential use is for disaster recovery. The other use is for out-of-place cluster upgrade.
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