[Need help]Streamming rows problem

I'm using a pool, get one connection to fetch rows, use another one to update rows back to mysql.
When the dataset is very small, like 100 rows, it works. But when it's little bigger, it stuck, the updateRow seems never invoked.any one could help?

pool.getConnection(function (err, conn) {
    conn.query("SELECT * FROM table")
            .on('result', function (row) {
                conn.pause()
                updateRow(row, function(){conn.resume()}) //update it back
            })
})
function updateRow(row, resume) {
    pool.getConnection(function (err, conn) {
        conn.query('UPDATE table SET ....', function(err, result) {
            resume()
        })
    })   
}

Start by reproducing the pooled-connection streaming example from the issue with a small and larger dataset. Inspect how result streaming, conn.pause(), and pool.getConnection interact during the UPDATE callback. Done means identifying and documenting or fixing why updates stop being invoked, with a verified reproduction.