Chunk Batcher 0/WARN

I get this in my development console of the client when in my server:

[15:50:11 INFO]: Client> [15:50:11] [Chunk Batcher 0/WARN]: Needed to grow BufferBuilder buffer: Old size 524288 bytes, new size 2621440 bytes.
[15:52:49 INFO]: Client> [15:52:49] [Chunk Batcher 0/WARN]: Needed to grow BufferBuilder buffer: Old size 524288 bytes, new size 2621440 bytes.
[15:52:50 INFO]: Client> [15:52:50] [Chunk Batcher 0/WARN]: Needed to grow BufferBuilder buffer: Old size 524288 bytes, new size 2621440 bytes.
[15:52:51 INFO]: Client> [15:52:51] [Chunk Batcher 1/WARN]: Needed to grow BufferBuilder buffer: Old size 524288 bytes, new size 2621440 bytes.