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https://issues.apache.org/jira/browse/HADOOP-18528?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran resolved HADOOP-18528.
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Fix Version/s: 3.4.0
3.3.5
Release Note:
ABFS block prefetching has been disabled to avoid HADOOP-18521 and buffer
sharing on multithreaded processes (Hive, Spark etc). This will have little/no
performance impact on queries against Parquet or ORC data, but can slow down
sequential stream processing, including CSV files -however, the read data will
be correct.
It may slow down distcp downloads, where the race condition does not arise. For
maximum distcp performance re-enable the readahead by setting
fs.abfs.enable.readahead to true.
Resolution: Fixed
> ABFS: Disable readAhead/prefetching by default
> ----------------------------------------------
>
> Key: HADOOP-18528
> URL: https://issues.apache.org/jira/browse/HADOOP-18528
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/azure
> Affects Versions: 3.3.4
> Reporter: Mehakmeet Singh
> Assignee: Mehakmeet Singh
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0, 3.3.5
>
>
> After the addition of HADOOP-18517, we should disable readAhead by default to
> mitigate inconsistent read results caused by ABFS prefetching, HADOOP-18521.
> As an urgent fix: Disable readAhead/prefetch, tracked for 3.3.5.
> Long-term fix: HADOOP-18521, tracked for 3.3.6.
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