See #761
aptly had a concept of loading small amount of info per each object
into memory once collection is accessed for the first time.
This might have simplified some operations, but it doesn't scale well
with huge aptly databases.
This is just intermediate step towards better memory management -
list of objects is not loaded unless some method is called.
`ForEach` method (mainly used in cleanup) is reimplemented to
iterate over database without ever loading all the objects into memory.
Memory was even worse with previous approach, as for each item usually
`LoadComplete()` is called, which pulls even more data into memory
and item stays in memory till the end of the iteration as it is referenced
from `collection.list`.
For the subsequent PR: reimplement `ByUUID()` and probably other methods
to avoid loading all the items into memory, at least for all the collecitons
except for published repos. When published repository is being loaded, it
might pull source local repo which in turn would trigger loading for all the
local repos which is not acceptable.
updates with contents generation were super syscall-heavy. for each path
in a package (so at least 2-4, but ordinarily >4) we'd do a db.Put in
ContentsIndex which results in one syscall.Write. so, for every package in
a published repo we'd have to do *at least* 2 but ordinarily >4 syscalls.
this gets abysmally slow very quickly depending on the available system
specs.
instead, start a batch inside each package and finish it when we are done
with the package. this should keep the memory footprint negligible, but
reduce the write() calls from N to 1.
on one of KDE's servers I have seen update publishing of 7600 packages go
from ~28s to ~9s when using batch putting on an HDD.
on my local system the same set of packages go from ~14s to ~6s on an SSD.
(all inodes in cache in both cases)
- new publish calls can now enable AcquireByHash by right away (previously
one would have had to create a new publishing endpoint and then
explicitly switch it to AcquireByHash)
- all json marshals of PublishedRepo now contain AcquireByHash (allows
inspecting if a given endpoint has AcquireByHash enabled already; also
enables verification that a switch/update actually applied a
potential AcquireByHash change
- update all tests to reflect that default state of AcquireByHash
- update creation and switch testing to explicitly toggle AcquireByHash to
make sure state mutation works as expected
The added "aptly publish repo" option "-access-by-hash" publishes
the index files (Packages*, Sources*) also as hardlinked hashes.
Example:
/dists/yakkety/main/binary-amd64/by-hash/SHA512/31833ec39acc...
The Release files indicate this with the option "Acquire-By-Hash: yes"
This is used by apt >= 1.2.0 and prevents the "Hash sum mismatch" race
condition between a server side "aptly publish repo" and "apt-get update"
on a client.
See: http://www.chiark.greenend.org.uk/~cjwatson/blog/no-more-hash-sum-mismatch-errors.html
This implementation uses symlinks in the by-hash/*/ directory for keeping
only two versions of the index files and deleting older files
automatically.
Note: this only works with aptly.FileSystemPublishedStorage
Closes: #536
Signed-off-by: André Roth <neolynx@gmail.com>
Allow skipping unreferenced files cleanup on publish switch/update/drop
via the -skip-cleanup command line option.
Also support API SkipCleanup parameter.
Fixes#570.
NB: Go `defer` order execution is reverse to the order `defer` statements
are executed.
So before the change, `Drop()` was called before `Close()`, which was no-op.
Change that to explicit order in single func, print errors if they happen.
This replaces `panic` which aborts aptly execution with warning
message on console. So aptly continues publishing actions, but
`Contents` indexes might be incomplete.
Error will be printed every time contents generation is triggered.
Debian's installer validates a mirror by downloading a Release,
and then cross-checking it based on its Codename and Suite. Without
a Suite field, the installer becomes unhappy (e.g. segfaults) and
won't continue the install.
Making the Codename and Suite the same validates with no problem.
Andrey Smirnov
aviau
Harald Sitter
Oliver Sauder
André Roth
Ludovico Cavedon
Alexander Guy