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From Raghu Angadi <rang...@apache.org>
Subject Re: transferToAllowed
Date Fri, 19 Nov 2010 23:23:03 GMT
When it is set to true (default), DN uses JDK's transferTo() interface to
avoid extra buffer copies.

It is possible though rare, some specific platform may not support this
efficiently or is unstable. The config exists to let users disable this
optimization. We have not seen any users that have disabled this though...

Raghu.

On Sun, Nov 14, 2010 at 9:56 AM, Thanh Do <thanhdo@cs.wisc.edu> wrote:

> got it here
> https://issues.apache.org/jira/browse/HADOOP-3164
>
>
> On Sun, Nov 14, 2010 at 11:31 AM, Thanh Do <thanhdo@cs.wisc.edu> wrote:
>
>> Hi all,
>>
>> Can somebody let me know what is this
>> parameter used for:
>>
>> dfs.datanode.transferTo.allowed
>>
>> It is not in default config,
>> and the maxChunksPerPacket depends on it.
>>
>> Thanks so much.
>> Thanh
>>
>
>

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