[jira] [Commented] (HDDS-6402) Introduce hashed key path locks for OBS bucket

["mingchao zhao (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDDS-6402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17650173#comment-17650173 ] 

mingchao zhao commented on HDDS-6402:
-------------------------------------

Ozone 1.3.0 had been released and we currently have more than 600 open issues targeted for 1.3.0. I am moving the target field to 1.4.0.

If there is anything needs to be discussed about the Target Version, Please reach out to me via Apache email or Slack.

> Introduce hashed key path locks for OBS bucket
> ----------------------------------------------
>
>                 Key: HDDS-6402
>                 URL: https://issues.apache.org/jira/browse/HDDS-6402
>             Project: Apache Ozone
>          Issue Type: New Feature
>          Components: Ozone Manager
>            Reporter: Rakesh Radhakrishnan
>            Assignee: Tanvi Penumudy
>            Priority: Major
>         Attachments: KEY_PATH_LOCK Design Document.pdf
>
>
> The goal of this task is to allow more concurrent operations(mixture of write and read) by replacing the global lock with a {{hash locking mechanism}} on key path.
> The performance of Ozone’s metadata write operations is limited by a {{{}bucket lock{}}}, which is a *global lock* for key operations. Each metadata write operation acquires the global bucket lock and holds it until that metadata operation is finished. This prevents concurrent execution of write and read operations even if they are fully independent on disjoint key paths. 
> In this task, we will be considering only the keys stored under {{OBJECT_STORE("OBS")}} bucket layout format. In future, the plan is to refine bucket locks for FSO bucket layouts as well, where we will need more complex hierarchical structure prefix based locking mechanism.



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