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https://issues.apache.org/jira/browse/HADOOP-14443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16081428#comment-16081428
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Jitendra Nath Pandey commented on HADOOP-14443:
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Committed to branch-2. Thanks to Santhosh G Nayak.
> Azure: Support retry and client side failover for authorization, SASKey and
> delegation token generation
> -------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-14443
> URL: https://issues.apache.org/jira/browse/HADOOP-14443
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs/azure
> Affects Versions: 2.9.0
> Reporter: Santhosh G Nayak
> Assignee: Santhosh G Nayak
> Fix For: 2.9.0, 3.0.0-beta1
>
> Attachments: HADOOP-14443.1.patch, HADOOP-14443.2.patch,
> HADOOP-14443.3.patch, HADOOP-14443.4.patch, HADOOP-14443.5.patch,
> HADOOP-14443.6.patch, HADOOP-14443.7.patch, HADOOP-14443-branch2-1.patch,
> HADOOP-14443-branch-2.2.patch, HADOOP-14443-branch2-2.patch
>
>
> Currently, {{WasRemoteCallHelper}} can be configured to talk to only one URL
> for authorization, SASKey generation and delegation token generation. If for
> some reason the service is down, all the requests will fail.
> So proposal is to,
> - Add support to configure multiple URLs, so that if communication to one URL
> fails, client can retry on another instance of the service running on
> different node for authorization, SASKey generation and delegation token
> generation.
> - Rename the configurations {{fs.azure.authorization.remote.service.url}} to
> {{fs.azure.authorization.remote.service.urls}} and
> {{fs.azure.cred.service.url}} to {{fs.azure.cred.service.urls}} to support
> the comma separated list of URLs.
> - Introduce a new configuration {{fs.azure.delegation.token.service.urls}} to
> configure the comma separated list of service URLs to get the delegation
> token.
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