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https://issues.apache.org/jira/browse/HDDS-13432?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDDS-13432:
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Labels: pull-request-available (was: )
> Accelerating Namespace Usage Calculation in Recon
> -------------------------------------------------
>
> Key: HDDS-13432
> URL: https://issues.apache.org/jira/browse/HDDS-13432
> Project: Apache Ozone
> Issue Type: Improvement
> Components: Ozone Recon
> Reporter: Arafat Khan
> Assignee: Arafat Khan
> Priority: Critical
> Labels: pull-request-available
>
> Recon calculates disk usage by recursively traversing the entire directory
> tree for a given bucket or volume, performing a RocksDB lookup for every
> directory. This process involves millions of individual reads for large
> buckets with deep and wide directory structures, causing:
> * Extremely high latency (e.g., 54 seconds for 5.6 million directories).
> * Poor performance due to millions of RocksDB Get operations, many hitting
> disk rather than cache.
> * Single-threaded traversal leading to underutilization of CPU resources.
> * Poor RocksDB key locality causing inefficient disk seeks and block-cache
> misses because directory summaries are stored with random keys.
> These issues result in slow and inefficient disk usage calculations,
> especially for very large and complex datasets.
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