Comments (2)
jongillham
commented on June 6, 2024
Currently nds will only fail a datastore operation when a memcache fail can potentially cause data inconsistency. If we take the situation where the memcache is working and nds saves something in it and it then stops working because of over quota limits, for example. If you try to Put to the datastore nds needs to ensure that the memcache is also deleted/updated. As it can't contact memcache it fails the entire Put operation for data consistency reasons. A subsequent Get may potentially return stale results if the memcache starts working again and the Get pulls the stale memcache value.
I had thought about using the capability API but that causes an extra RPC call and you still have the same issues as above.
If you don't require datastore consistency it could be simpler to role your own "try to get from memcache, if that fails then get from datastore".
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derekperkins
commented on June 6, 2024
@jongillham makes sense. Thanks for the feedback.
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Related Issues (20)
- Remove zeroMemcache* code. HOT 1
- It is not possible to detect if nested contexts are transactional. HOT 5
- Make the transaction context safe for concurrent access. HOT 1
- Failing tests with "appengine: NewContext passed an unknown http.Request" HOT 2
- Different namespaces used for memcache and datastore HOT 4
- Migrating data when the underlying struct changes HOT 2
- Tests fail when using nds HOT 14
- nds item not stored warning HOT 4
- Calling AddMulti for a single entity instead of Add HOT 2
- Panic with datastore.PropertyLoadSaver HOT 3
- Make compatible with cloud.google.com/go HOT 8
- ErrFieldMismatch in GetMulti returns only one result HOT 4
- Support saving of entities to memcache in putMulti() HOT 7
- Tag v2 branch as v2.0.0 HOT 3
- [v2] Possible marshal/unmarshaling bug HOT 2
- Change locking policy for Transaction HOT 1
- Change module versioning from git branches to subdirectories. HOT 2
- want new tag in v2 HOT 2
- failed to Put dial tcp 192.168.0.3:15127: connect: connection refused HOT 4
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