  We present the joint analysis of the X-ray and SZ signals in A2319, the
galaxy cluster with the highest signal-to-noise ratio in Planck maps and that
has been surveyed within our XMM Cluster Outskirts Project (X-COP). We recover
the thermodynamical profiles by the geometrical deprojection of the X-ray
surface brightness, of the SZ comptonization parameter, and an accurate and
robust spectroscopic measurements of the temperature. We resolve the clumpiness
of the density to be below 20 per cent demonstrating that most of this
clumpiness originates from the ongoing merger and can be associated to
large-scale inhomogeneities. This analysis is done in azimuthally averaged
radial bins and in eight independent angular sectors, enabling us to study in
details the azimuthal variance of the recovered properties. Given the exquisite
quality of the X-ray and SZ datasets, we constrain at $R_{200}$ the total
hydrostatic mass, modelled with a NFW profile, with very high precision
($M_{200} = 9.76 \pm 0.16^{stat.} \pm 0.31^{syst.} \times 10^{14} M_\odot$). We
identify the ongoing merger and how it is affecting differently the gas
properties in the resolved azimuthal sectors. We have several indications that
the merger has injected a high level of non-thermal pressure in this system:
the clumping free density profile is above the average profile obtained by
stacking Rosat observations; the gas mass fraction exceeds the expected cosmic
gas fraction beyond $R_{500}$; the pressure profile is flatter than the fit
obtained by the Planck collaboration; the entropy profile is flatter than the
mean one predicted from non-radiative simulations; the analysis in azimuthal
sectors has revealed that these deviations occur in a preferred region of the
cluster. All these tensions are resolved by requiring a relative support of
about 40 per cent from non-thermal to the total pressure at $R_{200}$.
