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Add explanation for default buffer size

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Signed-off-by: Artemiy Ryabinkov <getlag@ya.ru>
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Artemiy Ryabinkov
2019-08-08 13:43:26 +03:00
parent f76af93c21
commit e204afcc8c
1 changed files with 4 additions and 0 deletions
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chunkreader.go
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@@ -39,6 +39,10 @@ func New(r io.Reader) *ChunkReader {
// NewConfig creates and a new ChunkReader for r configured by config. // NewConfig creates and a new ChunkReader for r configured by config.
func NewConfig(r io.Reader, config Config) (*ChunkReader, error) { func NewConfig(r io.Reader, config Config) (*ChunkReader, error) {
if config.MinBufLen == 0 { if config.MinBufLen == 0 {
// By historical reasons Postgres currently has 8KB send buffer inside,
// so here we want to have at least the same size buffer.
// @see https://github.com/postgres/postgres/blob/249d64999615802752940e017ee5166e726bc7cd/src/backend/libpq/pqcomm.c#L134
// @see https://www.postgresql.org/message-id/0cdc5485-cb3c-5e16-4a46-e3b2f7a41322%40ya.ru
config.MinBufLen = 8192 config.MinBufLen = 8192
} }