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Posted to common-issues@hadoop.apache.org by "Steve Loughran (Jira)" <ji...@apache.org> on 2020/08/20 15:09:00 UTC
[jira] [Commented] (HADOOP-17215) ABFS: Excessive Create Overwrites
leads to race conditions
[ https://issues.apache.org/jira/browse/HADOOP-17215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17181249#comment-17181249 ]
Steve Loughran commented on HADOOP-17215:
-----------------------------------------
usual: tag affected versions, component etc
> ABFS: Excessive Create Overwrites leads to race conditions
> ----------------------------------------------------------
>
> Key: HADOOP-17215
> URL: https://issues.apache.org/jira/browse/HADOOP-17215
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Sneha Vijayarajan
> Assignee: Sneha Vijayarajan
> Priority: Major
>
> Filesystem Create APIs that do not accept an argument for overwrite flag end up defaulting it to true.
> We are observing that request count of creates with overwrite=true is more and primarily because of the default setting of the flag is true of the called Create API. When a create with overwrite ends up timing out, we have observed that it could lead to race conditions between the first create and retried one running almost parallel.
> To avoid this scenario for create with overwrite=true request, ABFS driver will always attempt to create without overwrite. If the create fails due to fileAlreadyPresent, it will resend the request with overwrite=true.
>
>
>
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