snvijaya opened a new pull request #1508: HADOOP-16548 : Disable Flush() over config URL: https://github.com/apache/hadoop/pull/1508 This PR renders OutputStream Flush() API to no-op in AbfsOutputStream over a config control. Hflush() being the only documented API that can provide persistent data transfer, Flush() also executing actions to persist buffered data was causing perf issues. OutputStreams of WASB and ADLS drivers already have the Flush() as a no-op too. Option to enable OutputStream Flush() over config is provided incase there are any customers who have taken a dependency on this.
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