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https://issues.apache.org/jira/browse/HADOOP-19557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17948409#comment-17948409
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ASF GitHub Bot commented on HADOOP-19557:
-----------------------------------------
steveloughran opened a new pull request, #7662:
URL: https://github.com/apache/hadoop/pull/7662
Calls to Syncable.hflush() on S3ABlockOutputStream instances are logged at
debug and the statistics counter upgraded
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### How was this patch tested?
* modify existing tests for new behaviour
* s3a tests ` -Dparallel-tests -DtestsThreadCount=9`
### For code changes:
- [X] Does the title or this PR starts 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?
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> 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
>
> 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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