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https://issues.apache.org/jira/browse/HDFS-14293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16774462#comment-16774462
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Shweta commented on HDFS-14293:
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[~belugabehr] Sure. So, if these variables don't have usages, shouldn't we
deprecate them?
> 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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