| Commit message (Collapse) | Author | Age | Files | Lines |
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Use raw time string from DB to generate ActiveRecord#cache_version
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When an `updated_at` column exists on the model, but is not available on the instance (likely due to a select), we should raise an error rather than silently not generating a cache_version. Without this behavior it's likely that cache entries will not be able to be invalidated and this will happen without notice.
This behavior was reported and described by @lsylvester in https://github.com/rails/rails/pull/34197#issuecomment-429668759.
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Currently, the `updated_at` field is used to generate a `cache_version`. Some database adapters return this timestamp value as a string that must then be converted to a Time value. This process requires a lot of memory and even more CPU time. In the case where this value is only being used for a cache version, we can skip the Time conversion by using the string value directly.
- This PR preserves existing cache format by converting a UTC string from the database to `:usec` format.
- Some databases return an already converted Time object, in those instances, we can directly use `created_at`.
- The `updated_at_before_type_cast` can be a value that comes from either the database or the user. We only want to optimize the case where it is from the database.
- If the format of the cache version has been changed, we cannot apply this optimization, and it is skipped.
- If the format of the time in the database is not UTC, then we cannot use this optimization, and it is skipped.
Some databases (notably PostgreSQL) returns a variable length nanosecond value in the time string. If the value ends in a zero, then it is truncated For instance instead of `2018-10-12 05:00:00.000000` the value `2018-10-12 05:00:00` is returned. We detect this case and pad the remaining zeros to ensure consistent cache version generation.
Before: Total allocated: 743842 bytes (6626 objects)
After: Total allocated: 702955 bytes (6063 objects)
(743842 - 702955) / 743842.0 # => 5.4% ⚡️⚡️⚡️⚡️⚡️
Using the CodeTriage application and derailed benchmarks this PR shows between 9-11% (statistically significant) performance improvement versus the commit before it.
Special thanks to @lsylvester for helping to figure out a way to preserve the usec format and for helping with many implementation details.
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[ci skip]
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This reverts commit 3420a14590c0e6915d8b6c242887f74adb4120f9, reversing
changes made to afb66a5a598ce4ac74ad84b125a5abf046dcf5aa.
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* Allow a default value to be declared for class_attribute
* Convert to using class_attribute default rather than explicit setter
* Removed instance_accessor option by mistake
* False is a valid default value
* Documentation
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This retains the existing behavior of
ActiveSupport::Cache.expand_cache_key (as used by etaging) where the
cache key includes the version.
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Mainly around `nil`
[ci skip]
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- When the named timestamp column is nil, we should just return the
cache_key with model name and id similar to the behavior of implicit
timestamp columns.
- Fixed one of the issue mentioned in https://github.com/rails/rails/issues/26417.
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The current code base is not uniform. After some discussion,
we have chosen to go with double quotes by default.
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The documentation states that parameter values longer than 20 characters
will be truncated by words, but the example shows that a parameter based
on "David Heinemeier Hansson" (with id: 125) becomes "125-david" when
"David Heinemeier".length == 16 so why so short?
The answer lies in the use of the #truncate option omission: nil which
seems to have been intended to mean "nothing", but which actually causes
the default string "..." to be used. This causes #truncate to cleave
words until the "..." can be added and still remain within the requested
size of 20 characters.
The better option is omission: '' (which is probably what was originally
intended).
Furthermore, since the use of #parameterize will remove non-alphanumeric
characters, we can maximize the useful content of the output by calling
parameterize first and then giving truncate a separator: /-/ rather than
a space.
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The default timestamp used for AR is `updated_at` in nanoseconds! (:nsec) This causes issues on any machine that runs an OS that supports nanoseconds timestamps, i.e. not-OS X, where the cache_key of the record persisted in the database (milliseconds precision) is out-of-sync with the cache_key in the ruby VM.
This commit adds:
A test that shows the issue, it can be found in the separate file `cache_key_test.rb`, because
- model couldn't be defined inline
- transactional testing needed to be turned off to get it to pass the MySQL tests
This seemed cleaner than putting it in an existing testcase file.
It adds :usec as a dateformat that calculates datetime in microseconds
It sets precision of cache_key to :usec instead of :nsec, as no db supports nsec precision on timestamps
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This allows rails code to be more confdent when asking for a model name, instead of having to ask for the class.
Rails core discussion here: https://groups.google.com/forum/#!topic/rubyonrails-core/ThSaXw9y1F8
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* Fix incorrectly named tests
* Restore Object#to_param behavior
* Ensure param is derived from a squished and truncated string
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attribute or method.
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Reuse the already existing logic used for grabbing this information from
the updated columns.
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attributes of which the highest will be used.
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- Extract max timestamp retrieval for cache_key
- Update changelog for cache_key changes
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This reverts commit 637a7d9d357a0f3f725b0548282ca8c5e7d4af4a, reversing
changes made to 5937bd02dee112646469848d7fe8a8bfcef5b4c1.
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This can be done using the class attribute cache_timestamp_format
Conflicts:
railties/guides/source/configuring.textile
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