Maximum transmission buffer size?

[Mike McGrady]

I missed this.  Thanks.

Sent from my iPhone

On Sep 29, 2009, at 1:32 AM, Trustin Lee (이희승)  
<trustin at gmail.com> wrote:

> Hi Iain,
>
> Netty does not stop you from writing infinitely fast.  If you write
> faster than Netty can flush, you will see OutOfMemoryError eventually.
> A mechanism that prevents this problem is provided by Netty, of
> course.  If the size of the write buffer is greater than certain
> threshold, Channel.isWritable() will start to return false.  You can
> check this property before each write request and stop writing when it
> turns false.  You are going to be notified when the write buffer size
> became smaller than certain threshold, you will be notified with a
> channelInterestChanged event, then you can continue writing messages.
> The discard client example demonstrates how to achieve this behavior.
>
> The threshold values are configurable in NioSocketChannelConfig.  The
> property names are 'writeBufferHighWaterMark' and
> 'writeBufferLowWaterMark' respectively.  Please refer to the Javadoc
> and let me know if you think the Javadoc could be improved.  I'd love
> to improve it.
>
> — Trustin Lee, http://gleamynode.net/
>
> On Sat, Sep 26, 2009 at 12:00 AM, Iain McGinniss  
> <iainmcgin at gmail.com> wrote:
>> Just a quick question, which should hopefully clarify an aspect of
>> Netty's philosophy for me. Say I have a network connection that is
>> capable of sending 64KB/s. I have an open TCP channel in Netty, and I
>> write to this channel at a rate of 128KB/s. This obviously results in
>> a growing queue of data at a rate of 64KB/s. Will Netty ever refuse  
>> to
>> enqueue my data for transmission, or discard any buffers passed to
>> write(), or will it eventually just throw a Java OutOfMemoryError,
>> when there is no more heap space left to store the queue of written
>> (but untransmitted) channel buffers?
>>
>> Iain
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>>
>
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