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fix: coalesce concurrent cache misses - #1711
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lucasmcdonald3 wants to merge 5 commits into
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When many encrypt/decrypt operations run concurrently against a cold cache for the same branch key, each cache miss independently queried the keystore, firing N DynamoDB GetItem and N KMS Decrypt calls instead of one. getBranchKeyMaterials now shares a single in-flight request per cache entry id, evicting it on settle so the cryptographic materials cache keeps ownership of caching and TTL. A rejected request is evicted too, so the next call retries rather than sharing the failure. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Track in-flight branch key requests per cache, so keyrings sharing a cache share requests. Coalesce concurrent caching CMM misses the same way; waiting encrypts read through the cache so each use counts against the entry's limits. Co-authored-by: Yosef Bensimchon <yosef.bensimchon@xero.com>
Copy branch key materials before sharing them with waiting callers, so a concurrent eviction cannot zero them first. In the caching CMM, let waiters request in parallel when the response cannot serve them.
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Issue #, if available: Fixes #1663, fixes #1665. Supersedes #1664 (its commit is included with authorship preserved).
Description of changes:
Coalesce concurrent cache misses in the hierarchical keyring and caching CMM
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