Summary:
Ref T2683. This is a refinement and simplification of D5257. In particular:
- D5257 only cached the commit chain, not path changes. This meant that we had to go issue an awkward query (which was slow on Facebook's install) periodically while reading the cache. This was reasonable locally but killed performance at FB scale. Instead, we can include path information in the cache. It is very rare that this is large except in Subversion, and we do not need to use this cache in Subversion. In other VCSes, the scale of this data is quite small (a handful of bytes per commit on average).
- D5257 required a large, slow offline computation step. This relies on D9044 to populate parent data so we can build the cache online at will, and let it expire with normal LRU/LFU/whatever semantics. We need this parent data for other reasons anyway.
- D5257 separated graph chunks per-repository. This change assumes we'll be able to pull stuff from APC most of the time and that the cost of switching chunks is not very large, so we can just build one chunk cache across all repositories. This allows the cache to be simpler.
- D5257 needed an offline cache, and used a unique cache structure. Since this one can be built online it can mostly use normal cache code.
- This also supports online appends to the cache.
- Finally, this has a timeout to guarantee a ceiling on the worst case: the worst case is something like a query for a file that has never existed, in a repository which receives exactly 1 commit every time other repositories receive 4095 commits, on a cold cache. If we hit cases like this we can bail after warming the cache up a bit and fall back to asking the VCS for an answer.
This cache isn't perfect, but I believe it will give us substantial gains in the average case. It can often satisfy "average-looking" queries in 4-8ms, and pathological-ish queries in 20ms on my machine; `hg` usually can't even start up in less than 100ms. The major thing that's attractive about this approach is that it does not require anything external or complicated, and will "just work", even producing reasonble improvements for users without APC.
In followups, I'll modify queries to use this cache and see if it holds up in more realistic workloads.
Test Plan:
- Used `bin/repository cache` to examine the behavior of this cache.
- Did some profiling/testing from the web UI using `debug.php`.
- This //appears// to provide a reasonable fast way to issue this query very quickly in the average case, without the various issues that plagued D5257.
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley, jhurwitz
Maniphest Tasks: T2683
Differential Revision: https://secure.phabricator.com/D9045
Summary: See D5657. Also cleans up the namespacing stuff a little bit.
Test Plan: Disabled APC and verified that setup checks didn't run normally, but did run after restart and on `/config/issue/`.
Reviewers: vrana
Reviewed By: vrana
CC: aran
Differential Revision: https://secure.phabricator.com/D5658
Summary:
Submoduling is slightly convenient for developers but hellishly difficult for many users. Since we make about a dozen updates to Javelin per year, just include the source directly.
Even if we run `git submodule status` more often, this creates additional problems for users with PATH misconfigured.
Fixes T2062 by nuking it from orbit.
Test Plan: Loaded site, browsed around. Grepped for references to submodules.
Reviewers: btrahan, vrana
CC: aran
Maniphest Tasks: T2062
Differential Revision: https://secure.phabricator.com/D4581
Summary:
- When a setup issue is nonfatal (i.e., a warning), instruct the user to edit the value from the web UI instead of using `bin/config`.
- When the user edits configuration in response to a setup issue, send them back to the issue when they're done.
- When an issue relates to PHP configuration, link to the PHP documentation on configuration.
- Add new-style setup check for timezone issues.
Test Plan: Mucked with my timezone config, resolved the issues I created.
Reviewers: codeblock, btrahan, vrana
Reviewed By: codeblock
CC: aran
Maniphest Tasks: T2221, T2228
Differential Revision: https://secure.phabricator.com/D4298
Summary:
See T2062. This cache allows us to essentially implement this sort of block:
if (this_code_has_not_run_since_the_last_server_restart()) {
...
}
This will let us do setup checks automatically (i.e., without a specialized setup mode) without imposing hundreds of milliseconds of `git submodule status` and similar checks on every page load, even if an install does not have APC.
Broadly, the major goals here are:
- Reduce user errors and support costs related to misconfiguration (e.g., failure to update submodules).
- Simplify setup and configuration (remove 'phabricator.setup', remove/reduce PHABRICATOR_ENV).
- Move as much configuration to the web as possible (required for SaaS).
Test Plan:
Added this block to webroot/index.php:
$cache = PhabricatorCaches::getSetupCache();
$result = $cache->getKeys(array('x'));
if (empty($result['x'])) {
phlog('Cache miss + set.');
$cache->setKeys(array('x' => 'y'));
} else {
phlog('Cache hit.');
}
Verified it used APC correctly.
Disabled APC and verified it degraded to a reasonable disk-based behavior.
If we miss both of these we end up with no actual caching, but that's the best we can do. This code will also run too early in setup for it to be appropriate to raise exceptions out of this pathway -- later on, we can raise a warning that APC is not installed.
Reviewers: btrahan, vrana
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T2227, T2062
Differential Revision: https://secure.phabricator.com/D4281
