Tencent/MMKV v2.2.0

on GitHub

v2.2.0 / 2025-04-24

We introduce the Mayfly FD (short-lived file descriptor) enhancement, reducing MMKV's fd footprint by half and more. For a single-process mode MMKV instance, the fd footprint is reduced to zero (except Android/OHOS, details below). For a multi-process mode MMKV instance, the fd footprint is reduced by half, for we still need a long-lived fd to inter-process lock the shared memory.

Changes for All platforms

• Add Mayfly FD (short-lived file descriptor) enhancement.
• Improve multi-process access efficiency by about 20%.
• Add checkExist() to check if a MMKV instance exists on disk.
• Drop deprecated armv7 AES hardware acceleration.

Android

• Reduce the fd footprint by half. For a single-process mode MMKV instance, we still need a long-lived fd to support the process-mode checker and legacy name upgrading. In the far future, when all legacy names have been upgraded, we might drop the long-lived fd like other platforms.
• Upgrade Android compileSdk/targetSdk to 35, NDK to 28.1, Java to 11, Gradle to 8.11.1, and AGP to 8.9.2.

HarmonyOS NEXT

• Reduce the fd footprint by half. For a single-process mode MMKV instance, we still need a long-lived fd to support the legacy name upgrading. In the far future, when all legacy names have been upgraded, we might drop the long-lived fd like other platforms.
• Drop checkProcessMode(), it’s never been used.
• Improve obfuscation configuration with relative path.

iOS

• Add +mmkvGroupPath to get the group folder for MMKV multi-process storage.