..
Copyright (c) 2019 Varnish Software AS
SPDX-License-Identifier: BSD-2-Clause
See LICENSE file for full text of license
.. _whatsnew_upgrading_2019_03:
%%%%%%%%%%%%%%%%%%%%%%%%
Upgrading to Varnish 6.2
%%%%%%%%%%%%%%%%%%%%%%%%
.. _whatsnew_upgrading_vcl_2019_03:
VCL
===
VCL programs for Varnish 6.1 can be expected to run without changes in
the new version.
A VCL load will now issue a warning, but does not fail as previously,
if a backend declaration uses the ``.path`` field to specify a Unix
domain socket, but the socket file does not exist or is not accessible
at VCL load time. This makes it possible to start the peer component
listening at the socket, or set its permissions, after Varnish starts
or the VCL is loaded. Backend fetches fail if the socket is not
accessible by the time the fetch is attempted.
``return(miss)`` from ``vcl_hit{}`` is now removed. An option for
implementing similar functionality is:
* ``return (restart)`` from ``vcl_hit{}``
* in ``vcl_recv{}`` for the restart (when ``req.restarts`` has
increased), ``set req.hash_always_miss = true;``.
.. _whatsnew_upgrading_params_2019_03:
Runtime parameters
==================
Some varnishd ``-p`` parameters that have been deprecated for some
time have been removed. If you haven't changed them yet, you have to
now. These are:
* ``shm_reclen`` -- use :ref:`ref_param_vsl_reclen` instead
* ``vcl_dir`` -- use :ref:`ref_param_vcl_path` instead
* ``vmod_dir`` -- use :ref:`ref_param_vmod_path` instead
The default value of :ref:`ref_param_thread_pool_stack` has been
increased from 48k to 56k on 64-bit platforms and to 52k on 32-bit
platforms. See the discussion under
:ref:`whatsnew_changes_params_2019_03` in
:ref:`whatsnew_changes_2019_03` for details.
.. _whatsnew_upgrading_std_conversion_2019_03:
Type conversion functions in VMOD std
=====================================
The existing type-conversion functions in :ref:`vmod_std(3)` have been
reworked to make them more flexible and easier to use. These functions
now also accept suitable numeral or quantitative arguments.
* :ref:`std.duration()`
* :ref:`std.bytes()`
* :ref:`std.integer()`
* :ref:`std.real()`
* :ref:`std.time()`
These type-conversion functions should be fully backwards compatible,
but the following differences should be noted:
* The *fallback* is not required anymore. A conversion failure in the
absence of a *fallback* argument will now trigger a VCL failure.
* A VCL failure will also be triggered if no or more than one argument
(plus optional *fallback*) is given.
* Conversion functions now only ever truncate if necessary (instead of
rounding).
* :ref:`std.round()` has been added for explicit rounding.
The following functions are deprecated and should be replaced by the
new conversion functions:
* ``std.real2integer()``
* ``std.real2time()``
* ``std.time2integer()``
* ``std.time2real()``
They will be removed in a future version of Varnish.
varnishadm and the CLI
======================
The ``-j`` option for JSON output has been added to a number of
commands, see :ref:`whatsnew_changes_cli_json` in
:ref:`whatsnew_changes_2019_03` and :ref:`varnish-cli(7)`. We
recommend the use of JSON format for automated parsing of CLI
responses (:ref:`varnishadm(1)` output).
.. _whatsnew_upgrading_backend_list_2019_03:
Listing backends
~~~~~~~~~~~~~~~~
``backend.list`` has grown an additional column, the output has
changed and fields are now of dynamic width:
* The ``Admin`` column now accurately states ``probe`` only if a
backend has some means of dynamically determining health state.
* The ``Probe`` column has been changed to display ``X/Y``, where:
* Integer ``X`` is the number of good probes in the most recent
window; or if the backend in question is a director, the number of
healthy backends accessed via the director or any other
director-specific metric.
* Integer ``Y`` is the window in which the threshold for overall
health of the backend is defined (from the ``.window`` field of a
probe, see :ref:`vcl(7)`); or in the case of a director, the total
number of backends accessed via the director or any other
director-specific metric.
If there is no probe or the director does not provide details,
``0/0`` is output.
* The ``Health`` column has been added to contain the dynamic (probe)
health state and the format has been unified to just ``healthy`` or
``sick``.
If there is no probe, ``Health`` is always given as
``healthy``. Notice that the administrative health as shown in the
``Admin`` column has precedence.
In the ``probe_message`` field of ``backend.list -j`` output, the
``Probe`` and ``Health`` columns appear as the array ``[X, Y,
health]``.
See :ref:`varnish-cli(7)` for details.
.. _whatsnew_upgrading_vcl_list_2019_03:
Listing VCLs
~~~~~~~~~~~~
The non-JSON output of ``vcl.list`` has been changed:
* The ``state`` and ``temperature`` fields appear in separate columns
(previously combined in one column).
* The optional column showing the relationships between labels and VCL
configurations (when labels are in use) has been separated into two
columns.
See :ref:`varnish-cli(7)` for details. In the JSON output for
``vcl.list -j``, this information appears in separate fields.
The width of columns in ``backend.list`` and ``vcl.list`` output
(non-JSON) is now dynamic, to fit the width of the terminal window.
For developers and authors of VMODs and API clients
===================================================
Python 3.4 or later is now required to build Varnish, or use scripts
installed along with Varnish, such as ``vmodtool.py`` to build VMODs
or other Varnish artifacts. Python 2 is no longer supported, and this
support will likely be dropped in a future 6.0 LTS release too.
The VRT API has been bumped to version 9.0. Changes include:
* Functions in the API have been added, and others removed.
* The ``VCL_BLOB`` type is now implemented as ``struct vrt_blob``.
* The ``req_bodybytes`` field of ``struct req`` has been removed, and
should now be accessed as an object core attribute.
See ``vrt.h``, the `change log`_ and
:ref:`whatsnew_changes_director_api_2019_03` in
:ref:`whatsnew_changes_2019_03` for details.
.. _change log: https://github.com/varnishcache/varnish-cache/blob/master/doc/changes.rst
The vmodtool has been changed significantly to avoid name clashes in
the C identifiers declared in ``vcc_if.h``. This may necessitate
changing names in your VMOD code. To facilitate renaming, ``vcc_if.h``
defines macros for prepending the vmod prefix, and for naming enums
and argument structs. For details, see the `change log`_, and examine
the contents of ``vcc_if.h`` after generation.
Going forward, we will adhere to the principle that data returned by
VMOD methods and functions are immutable. This is now enforced in some
places by use of the ``const`` modifier. A VMOD is free to do as it
sees fit within its own implementation, but if you attempt to change
something returned by another VMOD, the results are undefined.
*eof*
Henceforth, whatever our philosopher says about Matter will apply to extension and to extension alone. It cannot be apprehended by sight, nor by hearing, nor by smell, nor by taste, for it is neither colour, nor sound, nor odour, nor juice. Neither can it be touched, for it is not a body, but it becomes corporeal on being blended with sensible qualities. And, in a later essay, he describes it as receiving all things and letting them depart again without retaining the slightest trace of their presence.483 Why then, it may be asked, if Plotinus meant extension, could he not say so at once, and save us all this trouble in hunting out his meaning? There were very good reasons why he should not. In the first place, he wished to express himself, so far as possible, in Aristotelian phraseology, and this was incompatible with the reduction of Matter to extension. In the next place, the idea of an infinite void had been already appropriated by the Epicureans, to whose system he was bitterly opposed. And, finally, the extension of ordinary327 experience had not the absolute generality which was needed in order to bring Matter into relation with that ultimate abstraction whence, like everything else, it has now to be derived. That the millionaire was genuine, ¡°in person and not a caricature,¡± as Dick put it, was evident. Both the nurse, his relative, and his wife, were chatting with him as Jeff delivered the heavy packed ball made up of the gum. 233 "I guess not," said Landor, tolerantly, as he turned[Pg 106] his horse over to his orderly; "but, anyway," he added to Ellton, "we had a picnic¡ªof a sort." Si, unable to think of anything better, went with him. The train had stopped on a switch, and seemed likely to rust fast to the rails, from the way other trains were going by in both directions. The bridge gang, under charge of a burly, red-faced young Englishman, was in the rear car, with their tools, equipments, bedding and cooking utensils. THE DEACON HAS SOME EXPERIENCES WITH THE QUADRUPED. "You are not within a mile of the truth. I know it. Look here: I believe that is Gen. Rosecrans's own cow. She's gone, and I got an order to look around for her. I've never seen her, but from the description given me I believe that's she. Who brought her here?" "Deacon, these brothers and sisters who have come here with me to-night are, like myself, deeply interested in the moral condition of the army, where we all have sons or kinsmen. Now, can't you sit right there and tell us of your observations and experiences, as a Christian man and father, from day to day, of every day that you were down there? Tell us everything, just as it happened each day, that we may be able to judge for ourselves." HAS AN ENCOUNTER WITH THE PROVOST-MARSHAL. "Wonder which one o' them is the 200th Injianny's?" said Si to Shorty. "And your mother, and Harry?" The daughter must be the girl who was talking to him now. She sat on a little stool by the fire, and had brought out some sewing. "Over at Grandturzel¡ªcan't see wot's burning from here. Git buckets and come!" These things, however, gave little concern to the worthy who commanded the Kentish division. Tyler, though an excellent blacksmith, possessed few of the qualities requisite for forming a good general. Provided there was no very sensible diminution in the number of his followers, he cared not a straw for the score or two who, after quarrelling, or perhaps fighting, withdrew in such disgust that they vowed rather to pay the full tax for ever than submit to the insolence of the rebels. One man could fight as well as another, reasoned he; and, provided he was obeyed, what mattered it by whom. Dick went and Tom came¡ªit was sure to be all one in the end. But this burst of indignation soon passed away, and upon the suggestion of the prudent Sir Robert Hailes, he sent an evasive answer, with a command that the Commons should attend him at Windsor on the Sunday following. That it was a stratagem to gain entrance to the Tower, was the opinion of several, but, after much discussion, it was decided that the man should be admitted, and that the monk should be exhibited merely to intimidate the rebels, until the result of this promised communication should be known. HoMEŮͬÐÔÁµcbcb
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