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From "Junfan Zhang (Jira)" <j...@apache.org>
Subject [jira] [Updated] (FLINK-22534) Set delegation token's service name as credential alias
Date Fri, 07 May 2021 11:49:00 GMT

     [ https://issues.apache.org/jira/browse/FLINK-22534?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Junfan Zhang updated FLINK-22534:
    Attachment: debug2.PNG

> Set delegation token's service name as credential alias
> -------------------------------------------------------
>                 Key: FLINK-22534
>                 URL: https://issues.apache.org/jira/browse/FLINK-22534
>             Project: Flink
>          Issue Type: Improvement
>          Components: Connectors / Hadoop Compatibility
>            Reporter: Junfan Zhang
>            Assignee: Junfan Zhang
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: debug2.PNG
> h4. What
> Set the Hadoop delegation token's service name as credential alias.
> h4. Why
> In current implementation, Flink will use delegation token's service name or identifer
as credential  alias, refer to Flink code HadoopModule and Yarn Utils. 
> Firstly, I think we could use the same way to set credential alias, like delegation token's
service name. It will be more clear.
> Secondly, when fetching HDFS delegation token and then inject all tokens to current UserGroupInformation
in Hadoop HDFS federation mode, it will cause the problem of overwriting the different delegation
tokens with the same identifier, refer to code here.
> h5. When does the same identifier delegation tokens appear?
> Hadoop HA delegation tokens will have the same identifier(Refer to [HDFS-9276|https://issues.apache.org/jira/browse/HDFS-9276]),
but its' service name is different. So we can use service name as alias.
> The following figure from [HDFS-9276|https://issues.apache.org/jira/browse/HDFS-9276]
can show that the identifier of HA delegation token is the same.

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