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https://issues.apache.org/jira/browse/HDDS-13324?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Devesh Kumar Singh updated HDDS-13324:
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Description:
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.
was:
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 *O(n)* 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.
> Ozone Recon - Optimize memory footprint for 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
>
> 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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