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From John Lilley <john.lil...@redpoint.net>
Subject RE: HDFS buffer sizes
Date Fri, 24 Jan 2014 14:34:57 GMT
Ah, I see... it is a constant
CommonConfigurationKeysPublic.java:  public static final int IO_FILE_BUFFER_SIZE_DEFAULT =
4096;
Are there benefits to increasing this for large reads or writes?
john

From: Arpit Agarwal [mailto:aagarwal@hortonworks.com]
Sent: Thursday, January 23, 2014 3:31 PM
To: user@hadoop.apache.org
Subject: Re: HDFS buffer sizes

HDFS does not appear to use dfs.stream-buffer-size.

On Thu, Jan 23, 2014 at 6:57 AM, John Lilley <john.lilley@redpoint.net<mailto:john.lilley@redpoint.net>>
wrote:
What is the interaction between dfs.stream-buffer-size and dfs.client-write-packet-size?
I see that the default for dfs.stream-buffer-size is 4K.  Does anyone have experience using
larger buffers to optimize large writes?
Thanks
John



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