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https://issues.apache.org/jira/browse/HADOOP-19557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran resolved HADOOP-19557.
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Fix Version/s: 3.5.0
3.4.2
Resolution: Fixed
> S3A: S3ABlockOutputStream to never log/reject hflush(): calls
> -------------------------------------------------------------
>
> Key: HADOOP-19557
> URL: https://issues.apache.org/jira/browse/HADOOP-19557
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.4.1
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Critical
> Labels: pull-request-available
> Fix For: 3.5.0, 3.4.2
>
>
> Parquet's GH-3204 patch uses hflush() just before close()
> this is needless and hurts write performance on hdfs.
> For s3A it will trigger a warning long (Syncable is not supported) or an
> actual failure if
> fs.s3a.downgrade.syncable.exceptions is false
> proposed: hflush to log at debug -only log/reject on hsync, which is the real
> place where semantics cannot be met
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