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From Arpit Agarwal <aagar...@hortonworks.com>
Subject Re: HDFS buffer sizes
Date Fri, 24 Jan 2014 16:34:42 GMT
I don't think that value is used either except in the legacy block reader
which is turned off by default.


On Fri, Jan 24, 2014 at 6:34 AM, John Lilley <john.lilley@redpoint.net>wrote:

>  Ah, I seeā€¦ 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>
> 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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