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Posted to common-dev@hadoop.apache.org by "Steve Loughran (Jira)" <ji...@apache.org> on 2025/04/29 15:37:00 UTC

[jira] [Created] (HADOOP-19557) S3A: S3ABlockOutputStream to never log/reject hflush(): calls

Steve Loughran created HADOOP-19557:
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             Summary: 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
            Reporter: Steve Loughran


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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