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https://issues.apache.org/jira/browse/HADOOP-19946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18127772#comment-18127772
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ASF GitHub Bot commented on HADOOP-19946:
-----------------------------------------
bhattmanish98 opened a new pull request, #8830:
URL: https://github.com/apache/hadoop/pull/8830
### Description of PR
Introduces blob-layout-based data locality for the ABFS driver's Blob
endpoint client, allowing `AbfsInputStream` reads to fetch data directly from
the storage node hosting the relevant byte range rather than a generic
endpoint. Adds the `BlobLayout` model, an XML parser for the layout response, a
process-wide `BlobLayoutCache` with weight-based eviction and non-blocking
async prefetching backed by a dedicated executor, and wiring in
`AbfsBlobClient`/`AbfsInputStream` to look up and use endpoint-aware reads with
correctness fallback (partial/corrupted/ evicted-cache scenarios) to the
standard read path.
The feature is gated behind the `fs.azure.enable.data.locality`
configuration flag, which defaults to `false` (disabled), so existing behavior
is unchanged unless explicitly opted in.
### How was this patch tested?
Includes unit and integration tests covering `BlobLayout` parsing, caching,
eviction (capacity/idle/weight-based), and `AbfsInputStream` read behavior
across scenarios: data not returned, corrupted/partial responses, and cache
eviction during read.
Additionally manually validated end-to-end against a live Azure Storage
account with the Blob endpoint and data locality enabled, confirming the
blob-layout lookup, caching, and endpoint-aware read path behave asexpected.
### For code changes:
- [x] Does the title of this PR start with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [x] Object storage: Have the integration tests been executed and the
endpoint declared according to the connector-specific documentation? *Note:
Automated CI testing doesn't cover all cases so manual testing with cloud
storage is still required.*
- [x] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [x] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
### AI Tooling
Contains content generated by GitHub Copilot.
- [x] The PR includes the phrase "Contains content generated by <tool>"
where <tool> is the name of the AI tool used.
- [x] My use of AI contributions follows the ASF legal policy
https://www.apache.org/legal/generative-tooling.html
> ABFS: Enable data locality aware reads for Azure Blob Storage
> -------------------------------------------------------------
>
> Key: HADOOP-19946
> URL: https://issues.apache.org/jira/browse/HADOOP-19946
> Project: Hadoop Common
> Issue Type: New Feature
> Components: fs/azure
> Reporter: Manish Bhatt
> Assignee: Manish Bhatt
> Priority: Major
>
> Introduce data locality support in ABFS to improve read performance for Azure
> Blob Storage by routing read requests to the endpoint that hosts the required
> data range. The goal is to reduce latency, improve throughput, and make read
> operations more efficient for large files and distributed workloads. This
> work adds blob layout discovery, range-to-endpoint mapping, locality-aware
> range selection, and caching of layout metadata to avoid repeated lookups. It
> also enables segmented read-ahead aligned with locality boundaries and adds
> safeguards for concurrency, eviction, timeout handling, and failure
> propagation needed for reliable production-scale reads.
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