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https://issues.apache.org/jira/browse/HDFS-3953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13467387#comment-13467387
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Jing Zhao commented on HDFS-3953:
---------------------------------
The value of HdfsConstants.DEFAULT_DATA_SOCKET_SIZE is 128KB, and in
DFSClient#create(String, boolean, short, long, Progressable),
dfsClientConf.ioBufferSize (default value is 4096) is used as value of buffer
size. So I guess the buffer size is used for creating BufferedOutputStream
instance? I.e., in DFSOutputStream.DataStreamer#createBlockOutputStream and
DFSOutputStream.DataStreamer#transfer, we should use the given buffer size for
creating BufferedOutputStream instance.
> DFSOutputStream constructor does not use bufferSize parameter
> -------------------------------------------------------------
>
> Key: HDFS-3953
> URL: https://issues.apache.org/jira/browse/HDFS-3953
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Jing Zhao
> Assignee: Jing Zhao
>
> DFSOutputStream constructor does not use bufferSize parameter. However, a
> buffer size is always passed in many other methods defined in DFSClient,
> DistributedFileSystem, and Hdfs.
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