openresty / openresty/lua-nginx-module
Is there any plan to implement a read-wirte lock for lua_shared_dict
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- Dominant language
- C
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Description
I was working on a dynamic upstream feature for Marathon-docker framework with balancer_by_lua_block, which upstream server list stored in lua_shared_dict. At this case, server list reading must be blocked when reloading the server list, and it's not a good idea to get a lock at each http request. I think, that could be properly solved with a read-write lock.
So, do you have any plan to implement a read-wirte lock for lua_shared_dict
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
The issue names lua_shared_dict and balancer_by_lua_block but no source files or tests. Start by locating their implementations and existing locking behavior in this repository. Done would require a defined read-write locking approach for shared-dictionary access, with tests covering reads during server-list reloads.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- c, lua
- Domain
- backend
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 20/100