ExistenceCacheStore now only evicts based on insert #1203
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Reviewable status: 0 of 1 LGTMs obtained, and 0 of 9 files reviewed, and pending CI: Analyze (javascript-typescript), Analyze (python), Bazel Dev / ubuntu-22.04, Cargo Dev / macos-13, Cargo Dev / ubuntu-22.04, Installation / macos-13, Installation / macos-14, Installation / ubuntu-22.04, Local / ubuntu-22.04, Publish image, Publish nativelink-worker-init, Publish nativelink-worker-lre-cc, Remote / large-ubuntu-22.04, asan / ubuntu-22.04, docker-compose-compiles-nativelink (20.04), docker-compose-compiles-nativelink (22.04), integration-tests (20.04), integration-tests (22.04), macos-13, pre-commit-checks, ubuntu-20.04 / stable, ubuntu-22.04, ubuntu-22.04 / stable, vale, windows-2022 / stable (waiting on @adam-singer)
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To protect against a case where the parent layer store has items hot in cache and those items are frequently touched, we would never actually ask the underlying store for the data. This caused a problem because the underlying store might evict our item, then our parent ExistenceCacheStore would never let go of the item causing the node to be required to shutdown to clear it up. This was a vary rare event, because most items have `.get()` eventually called on the digest, which refreshes the underlying store object. closes TraceMachina#1199
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To protect against a case where the parent layer store has items hot in cache and those items are frequently touched, we would never actually ask the underlying store for the data. This caused a problem because the underlying store might evict our item, then our parent ExistenceCacheStore would never let go of the item causing the node to be required to shutdown to clear it up.
This was a vary rare event, because most items have
.get()eventually called on the digest, which refreshes the underlying store object.closes #1199
This change is