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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-12294) Let distcp to bypass external attribute provider when calling getFileStatus etc at source cluster
Date Fri, 08 Sep 2017 14:52:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-12294?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yongjun Zhang resolved HDFS-12294.
----------------------------------
    Resolution: Won't Fix

> Let distcp to bypass external attribute provider when calling getFileStatus etc at source
cluster
> -------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-12294
>                 URL: https://issues.apache.org/jira/browse/HDFS-12294
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs
>            Reporter: Yongjun Zhang
>            Assignee: Yongjun Zhang
>
> This is an alternative solution for HDFS-12202, which proposed introducing a new set
of API, with an additional boolean parameter bypassExtAttrProvider, so to let NN bypass external
attribute provider when getFileStatus. The goal is to avoid distcp from copying attributes
from one cluster's external attribute provider and save to another cluster's fsimage.
> The solution here is, instead of having an additional parameter, encode this parameter
to the path itself, when calling getFileStatus (and some other calls), NN will parse the path,
and figure out that whether external attribute provider need to be bypassed. The suggested
encoding is to have a prefix to the path before calling getFileStatus, e.g. /ab/c becomes
/.reserved/bypassExtAttr/a/b/c. NN will parse the path at the very beginning.
> Thanks much to [~andrew.wang] for this suggestion. The scope of change is smaller and
we don't have to change the FileSystem APIs.
>  



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