"God pit" Dotnetty memory leak resolution

Background

Recently in the use of Dotnetty to implement a file upload download synchronization service.

Where: Client download server file, client multiple requests, from the server to download the file shard, append to the local disk.

-Very simple code, all written dozens of times, at ease.

Here's the problem.

However: in the stress test, I download a Win10 ISO image, 4 G.

I found: client memory keeps growing until memory overflows-I wipe.

VS2015 Memory Diagnostics

Memory diagnostics, we found that many 16M (16777228 bytes) of byte[] occupy memory.

And I'm requesting the server file shard only 64K

-And I'm sure: these 16M byte[] must have been created by Dotnetty.

Debug code

By debugging the code, you do discover where these 16M bytes are located:

((DotNetty.Buffers.PooledByteBufferAllocator)    ((DotNetty.Transport.Channels.AbstractChannelHandlerContext)context)    .Allocator)        .directArenas

Shorthand is:

context.Allocator.directArenas

Knowing where the data for the memory leak exists, the rest is to delete the data.

Because Allocator and directArenas both are inaccessible (private type)

I guess: According to the Microsoft Framework's custom, there must be properties or methods to set this thing.

--I think too much, I have been looking for a long time can not find the relevant method.

Universal Solution: Anti-compilation

There must be a way to fix this data until the data is there.

Reflection is omnipotent--but I don't want to use it.

Then, start the decompile: see directArenas where the field is assigned, and where to add the data.

Problem solving

Run the program again, the memory is stable in the 30m--memory leak problem is resolved.

This time, the most useless change bug, Dotnetty no Microsoft style.

The Microsoft framework basically has a style: the bottom layer must provide a variety of functions, properties-Default will give you a most stable default value.

This is Java urine sex: All kinds of parameters are strange, not enough parameters can not run-give me a default parameter is so difficult ~

"God pit" Dotnetty memory leak resolution