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Posted to common-issues@hadoop.apache.org by "Bilahari T H (Jira)" <ji...@apache.org> on 2020/07/06 11:32:00 UTC
[jira] [Assigned] (HADOOP-17092) ABFS: Long waits and unintended
retries when multiple threads try to fetch token using ClientCreds
[ https://issues.apache.org/jira/browse/HADOOP-17092?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Bilahari T H reassigned HADOOP-17092:
-------------------------------------
Assignee: Bilahari T H (was: Sneha Vijayarajan)
> ABFS: Long waits and unintended retries when multiple threads try to fetch token using ClientCreds
> --------------------------------------------------------------------------------------------------
>
> Key: HADOOP-17092
> URL: https://issues.apache.org/jira/browse/HADOOP-17092
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/azure
> Reporter: Sneha Vijayarajan
> Assignee: Bilahari T H
> Priority: Major
> Fix For: 3.4.0
>
>
> Issue reported by DB:
> we recently experienced some problems with ABFS driver that highlighted a possible issue with long hangs following synchronized retries when using the _ClientCredsTokenProvider_ and calling _AbfsClient.getAccessToken_. We have seen [https://github.com/apache/hadoop/pull/1923|https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fapache%2Fhadoop%2Fpull%2F1923&data=02%7c01%7csnvijaya%40microsoft.com%7c7362c5ba4af24a553c4308d807ec459d%7c72f988bf86f141af91ab2d7cd011db47%7c1%7c0%7c637268058650442694&sdata=FePBBkEqj5kI2Ty4kNr3a2oJgB8Kvy3NvyRK8NoxyH4%3D&reserved=0], but it does not directly apply since we are not using a custom token provider, but instead _ClientCredsTokenProvider_ that ultimately relies on _AzureADAuthenticator_.
>
> The problem was that the critical section of getAccessToken, combined with a possibly redundant retry policy, made jobs hanging for a very long time, since only one thread at a time could make progress, and this progress amounted to basically retrying on a failing connection for 30-60 minutes.
>
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