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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13972) Access multiple Azure Data Lake stores with different SPIs
Date Wed, 11 Jan 2017 13:16:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15818304#comment-15818304
] 

Steve Loughran commented on HADOOP-13972:
-----------------------------------------

I propose you follow the pattern of HADOOP-13336, where every property {{fs.s3a.bucket.$BUCKET.field1.field2=value}}
is patched in to {{fs.s3a.field1.field2=}} for the FS named $BUCKET. This allows for every
FS property to be overridden, rather than per-store keys. 

# This structure follows that of the hdfs HA nn property settings.
# It's easy to add; you don't need to implement the complex "read one then fallback" strategy,
just do a patch in FileSystem.init().

I'm about the put the patch into branch-2.8+ with the core code in S3AUtils. Once it's in,
you could pull it up into hadoop common and make more generic, that way we'd have a consistent
implementation across filesystems.

> Access multiple Azure Data Lake stores with different SPIs
> ----------------------------------------------------------
>
>                 Key: HADOOP-13972
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13972
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs/adl
>    Affects Versions: 3.0.0-alpha2
>            Reporter: John Zhuge
>
> Useful when distcp needs to access 2 Data Lake stores with different SPIs.
> Of course, a workaround is to grant the same SPI access permission to both stores, but
sometimes it might not be feasible.
> One idea is to embed the store name in the configuration property names, e.g., {{dfs.adls.oauth2.<store>.client.id}}.
Per-store keys will be consulted first, then fall back to the global keys.



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