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https://issues.apache.org/jira/browse/HADOOP-19394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17954996#comment-17954996
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ASF GitHub Bot commented on HADOOP-19394:
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ahmarsuhail opened a new pull request, #7720:
URL: https://github.com/apache/hadoop/pull/7720
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### Description of PR
This is the initial PR for readVectored().
TODO:
* Add more tests in ITestS3AContractAnalyticsStreamVectoredRead
* use the ```readVectored(List<? extends FileRange> ranges,
IntFunction<ByteBuffer> allocate,
release)``` method.
Before this can be merged AAL with readVectored() will need to released,
planning a 1.2.0 release for next week.
### How was this patch tested?
Testing in progress.
> S3A Analytics Accelerator: vector IO support
> --------------------------------------------
>
> Key: HADOOP-19394
> URL: https://issues.apache.org/jira/browse/HADOOP-19394
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.4.1
> Reporter: Steve Loughran
> Priority: Major
>
> Add vector IO support for analytics accelerator stream
> Three stages
> # pull up s3a input stream to work with all ObjectInputStreams; do its own
> fetching independent of the analytics stream
> # provide info to stream of fetches having taken place (remove from cache,
> cancel prefetch)
> full integration
> * return a range from cache if present
> * append to the block retrieval callback if a prefetch is in progress
> * only do merge + new request if the range cannot be satisifed entirely from
> cached data
> Out of scope: handling case where part of a range is in cache/retrieval. Too
> complicated and so prone to problems.
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