[jira] [Created] (FLINK-20918) Avoid excessive flush of Hadoop output stream

[Paul Lin (Jira)]

Paul Lin created FLINK-20918:
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             Summary: Avoid excessive flush of Hadoop output stream
                 Key: FLINK-20918
                 URL: https://issues.apache.org/jira/browse/FLINK-20918
             Project: Flink
          Issue Type: Bug
    Affects Versions: 1.11.3, 1.12.0
            Reporter: Paul Lin


[HadoopRecoverableFsDataOutputStream#sync|https://github.com/apache/flink/blob/67d167ccd45046fc5ed222ac1f1e3ba5e6ec434b/flink-filesystems/flink-hadoop-fs/src/main/java/org/apache/flink/runtime/fs/hdfs/HadoopRecoverableFsDataOutputStream.java#L123]
 calls both `hflush` and `hsync`, whereas `hsync` is an enhanced version of 
`hflush`. We should remove the `hflush` call to avoid the excessive flush.



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