Is lua script atomic execution guaranteed? #3489
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Hey team, I have wondered about the behavior of Lua script in term of atomic execution. In Redis database, atomic execution is assured by nature because Redis is the single-threaded engine. While KVRocks does not employ the single-threaded model, is the atomic execution guaranteed? P/s: By saying atomic operation, I mean there is no interleaving during script execution. Meaning that, all check-then-act operations in Lua script do not undergo race condition. |
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Replies: 2 comments 4 replies
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Yes, it can be guaranteed. By default, write scripts are made atomic by a global exclusivity lock (EVAL/FCALL are exclusive when lua-strict-key-accessing=no) cc @git-hulk Please confirm that my understanding is accurate. |
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Yes, EVAL/FCALL behaves like Redis by using the global exclusivity lock between threads. And |
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When For both scenarios, atomic is guaranteed. |
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With As I saw in I will be really helpful for us to understand the working mechanism with |
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When Kvrocks has fine-grained key locks which will ensure that no other commands that accesses |
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Thx u for your explanation |
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When
lua-strict-key-accessingisno, a global lock is enabled for all EVAL/FCALL commands (slower);and when
lua-strict-key-accessingisyes, EVAL/FCALL commands will be controlled by fine-grained key locks (faster).For both scenarios, atomic is guaranteed.