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https://issues.apache.org/jira/browse/HDFS-14293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16773583#comment-16773583
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BELUGA BEHR commented on HDFS-14293:
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[~shwetayakkali] Same goes for: {{io.file.buffer.size}}
https://github.com/apache/hadoop/blob/d43af8b3db4743b4b240751b6f29de6c20cfd6e5/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeysPublic.java#L236-L239
https://github.com/apache/hadoop/blob/fb8932a727f757b2e9c1c61a18145878d0eb77bd/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSUtilClient.java#L740-L744
> Increase Default Size of dfs.stream-buffer-size
> -----------------------------------------------
>
> Key: HDFS-14293
> URL: https://issues.apache.org/jira/browse/HDFS-14293
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 3.2.0
> Reporter: BELUGA BEHR
> Priority: Minor
>
> For many years (7+) now, the JDK has been using a default buffer size of
> [8192
> bytes|https://github.com/openjdk-mirror/jdk7u-jdk/blob/master/src/share/classes/java/io/BufferedInputStream.java#L53].
> Hadoop still defaults to a size half of that. The default is
> {{dfs.stream-buffer-size}} is 4096 bytes.
> https://hadoop.apache.org/docs/r2.8.0/hadoop-project-dist/hadoop-hdfs/hdfs-default.xml
> Please increase default size to 8192.
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