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https://issues.apache.org/jira/browse/HADOOP-19596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18006609#comment-18006609
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Steve Loughran commented on HADOOP-19596:
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ok, look at the filesystem spec for openFIle and don't do this if the read
policy is random, vectored, parquet, orc, but only for : whole-file,
sequential, adaptive (plus whatever default you want).
parquet now opens files as "parquet, vector, random, adaptive" in order of
preference
> ABFS: [ReadAheadV2] Increase Prefetch Aggressiveness to improve sequential
> read performance
> -------------------------------------------------------------------------------------------
>
> Key: HADOOP-19596
> URL: https://issues.apache.org/jira/browse/HADOOP-19596
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/azure
> Affects Versions: 3.5.0, 3.4.1
> Reporter: Anuj Modi
> Assignee: Anuj Modi
> Priority: Major
>
> Various analyses done in the past have shown a need for significant
> improvement in the performance of sequential reads. The current
> implementation clearly shows the lack of parallelism that is needed to cater
> to high throughput sequential read workloads.
> More details on updated design and results of POC benchmarking will be added
> here soon.
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