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MSAL extension library is implementation of ITokenCacheAccessAspect from https://github.com/AzureAD/microsoft-authentication-library-for-java, which provides token cache persistence in secure permanent memory.

To synchronize access to persisted cache cross-process lock is used, it is based on OS level file locks. File locks are not 100% reliable load on Unix based OS – Mac + Linux.
Taking to account that file lock based cross-process locks are already used in prod by .NET extension lib on Mac – changing file lock implementation is problematic.
Race conditions (as result of unreliable nature of file locks on mac + Linux) are observed only under stress testing, not under normal load. Stress testing data shows that percentage of lost updates is under % 2 on Mac.
It was decided to keep using file lock based cross platform lock + make sure that MSAL + MSAL extension SDK is resilient to possible race conditions. Race conditions effects + mitigation approaches
Token Cache serialization performance

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