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...that ignores compactification.
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... instead of static calls to GarbageCollector
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During garbage collection split and remove from the storage every entry that is larger than a threshold.
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During garbage collection remove from the storage every entry that has the large entry.
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* Uplink parts of the large entry before entry itself;
* Uplink large entries in LargeObjectCAS::GetEntryPath to not split things two times;
* Promote spliced tree during uplinking of a large tree entry to properly promote parts of the tree;
* Uplink large entries in LocalUplink{Blob, Tree} to support proper uplinking in Action Cache and Target Cache;
Tested:
* Uplink large blobs and trees;
* Uplink a large object that depends on other large objects.
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When running in single node, serve endpoint should not even
consider sharding. Additionally, garbage collection uplinking
should also take the shard into account. For this purpose, a
TargetCache instance now remembers if it was explicitly sharded and
passed that information to the GarbageCollector for uplinking.
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... and make rotation of generations optional, as with the removal
of ephemeral data there is now a useful collection even without
rotating generations.
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The improved GC implementation uses refactored storage
classes instead of directly accessing "unknown" file paths.
The required storage class refactoring is quite substantial
and outlined in the following paragraphs.
The module `buildtool/file_system` was extended by:
- `ObjectCAS`: a plain CAS implementation for
reading/writing blobs and computing digests for a given
`ObjectType`. Depending on that type, files written to the
file system may have different properties (e.g., the x-bit
set) or the digest may be computed differently (e.g., tree
digests in non-compatible mode).
A new module `buildtool/storage` was introduced containing:
- `LocalCAS`: provides a common interface for the "logical
CAS", which internally combines three `ObjectCAS`s, one
for each `ObjectType` (file, executable, tree).
- `LocalAC`: implements the action cache, which needs the
`LocalCAS` for storing cache values.
- `TargetCache`: implements the high-level target cache,
which also needs the `LocalCAS` for storing cache values.
- `LocalStorage`: combines the storage classes `LocalCAS`,
`LocalAC`, and `TargetCache`. Those are initialized with
settings from `StorageConfig`, such as the build root base
path or number of generations for the garbage collector.
`LocalStorage` is templated with a Boolean parameter
`kDoGlobalUplink`, which indicates that, on every
read/write access, the garbage collector should be used
for uplinking across all generations (global).
- `GarbageCollector`: responsible for garbage collection and
the global uplinking across all generations. To do so, it
employs instances of `LocalStorage` with `kDoGlobalUplink`
set to false, in order to avoid endless recursion. The
actual (local) uplinking within two single generations is
performed by the corresponding storage class (e.g.,
`TargetCache` implements uplinking of target cache entries
between two target cache generations etc.). Thereby, the
actual knowledge how data should be uplinked is
implemented by the instance that is responsible for
creating the data in the first place.
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