about Netty cause OutOfDirectMemoryError

[you fu]

Hi , When my application occur OutOfDirectMemoryError, dump JVM memory profile.

the io.netty.channel.ChannelOutboundBuffer instance  totalPendingSize  is  13,864,807,239 , and unwritable is 1.

the server code is 

          .childOption(ChannelOption.WRITE_BUFFER_HIGH_WATER_MARK, 67108864)  //16MB

          .childOption(ChannelOption.WRITE_BUFFER_LOW_WATER_MARK, 1048576) //1M 

why the totalPendingSize can increase to  13,864,807,239?

[you fu]

the Netty veriosn is 4.0.42.Final 

[you fu]

I read the source code and debug it .

find DefaultMessageSizeEstimator size method  

public int size(Object msg) {
    if (msg instanceof ByteBuf) {
        return ((ByteBuf)msg).readableBytes();
    } else if (msg instanceof ByteBufHolder) {
        return ((ByteBufHolder)msg).content().readableBytes();
    } else {
        return msg instanceof FileRegion ? 0 : this.unknownSize;
    }
}

if msg is my customize msg ,the size is only 8 .

so I read the code ,and  channel config ChannelOption.MESSAGE_SIZE_ESTIMATOR,

I implement myMessageSizeEstimator use code config  

  .childOption(ChannelOption.MESSAGE_SIZE_ESTIMATOR, MyDefaultMessageSizeEstimator.DEFAULT)

is it right?

[Norman Maurer]

Yes that’s the way to go 

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[you fu]

thank you for reply.

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