[jira] [Resolved] (HDDS-13324) Optimize memory footprint for Recon listKeys API

["Stephen O'Donnell (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDDS-13324?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stephen O'Donnell resolved HDDS-13324.
--------------------------------------
    Fix Version/s: 2.1.0
       Resolution: Fixed

> Optimize memory footprint for Recon listKeys API
> ------------------------------------------------
>
>                 Key: HDDS-13324
>                 URL: https://issues.apache.org/jira/browse/HDDS-13324
>             Project: Apache Ozone
>          Issue Type: Task
>          Components: Ozone Recon
>    Affects Versions: 2.0.0
>            Reporter: Devesh Kumar Singh
>            Assignee: Devesh Kumar Singh
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 2.1.0
>
>
> While constructing full path prefix in constructFullPathPrefix method, below code can be expensive:
> {code:java}
> fullPath.insert(0, nsSummary.getDirName() + OM_KEY_PREFIX);{code}
>  * Inserting at position {{0}} in a {{StringBuilder}} has 
> {noformat}
> O(n){noformat}
>  cost because it must shift the entire buffer every time.
>  * For deeply nested paths (e.g., {{{}/a/b/c/d/e/f/g/...{}}}), this compounds quickly.



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