- ErrGRPCNotCapable("etcdserver: not capable") -> codes.FailedPrecondition (it will not autofix, it requires new version of server)
- ErrGPRCNotSupportedForLearner("etcdserver: rpc not supported for learner") -> codes.FailedPrecondition (as long as its learner, the call will not work)
- ErrGRPCClusterVersionUnavailable("etcdserver: cluster version not found during downgrade") -> codes.FailedPrecondition (backend does not contain the version (old etcd?) so retry will not help)
https://github.com/etcd-io/etcd/runs/2599598633?check_suite_focus=true
```
{"level":"warn","ts":"2021-05-17T09:55:30.246Z","logger":"etcd-client","caller":"v3/retry_interceptor.go:62","msg":"retrying of unary invoker failed","target":"etcd-endpoints://0xc000539880/#initially=[unix://localhost:m30]","attempt":0,"error":"rpc error: code = Unavailable desc = etcdserver: rpc not supported for learner"}
{"level":"warn","ts":"2021-05-17T09:55:30.270Z","logger":"etcd-client","caller":"v3/retry_interceptor.go:62","msg":"retrying
of unary invoker
failed","target":"etcd-endpoints://0xc000539880/#initially=[unix://localhost:m30]","attempt":1,"error":"rpc
error: code = Unavailable desc = etcdserver: rpc not supported for
learner"}`
```
clientv3 logs (especially tests) were poluted with unattributed to testing.T log lines:
```
{"level":"warn","ts":"2021-04-29T12:42:11.055+0200","logger":"etcd-client","caller":"v3/retry_interceptor.go:64","msg":"retrying of unary invoker failed","target":"etcd-endpoints://0xc0000fafc0/#initially=[unix://localhost:m10]","attempt":0,"error":"rpc error: code = ResourceExhausted desc = etcdserver: mvcc: database space exceeded"}
```
The reasons were 2 fold:
- Interceptors were copying logger before "WithLogger" could modify it.
- We were not propagating the loggers in a few testing contexts.
The flag protects etcd memory from being swapped out to disk.
This can happen in memory constrained systems where mmaped bbolt
area is natural condidate for swapping out.
This flag should provide better tail latency on the cost of higher RSS
ram usage. If the experiment is successful, the logic should get moved
into bbolt layer, where we can protect specific bbolt instances
(e.g. avoid protecting both during defragmentation).
1) Fix the path for rpc errors
2) The README says 2 types of client errors vs doc mentioning 3
types of client errors. grpc erros should be considered single time
as covered in the README.
This is not yet implementation, just API and tests to be filled
with implementation in next CLs,
tracked by: https://github.com/etcd-io/etcd/issues/12652
We propose here 3 packages:
- clientv3/naming/endpoints ->
That is abstraction layer over etcd that allows to write, read &
watch Endpoints information. It's independent from GRPC API. It hides
the storage details.
- clientv3/naming/endpoints/internal ->
That contains the grpc's compatible Update class to preserve the
internal JSON mashalling format.
- clientv3/naming/resolver ->
That implements the GRPC resolver API, such that etcd can be
used for connection.Dial in grpc.
Please see the grpc_naming.md document changes & grpcproxy/cluster.go
new integration, to see how the new abstractions work.
- build & test scripts deprecated. Call *.sh variants.
This will avoid delete the symlinks and get rid of
subtle dependency on 'sed --follow-symlinks' on OsX/BSD sed.
- Fix parameters to mktemp
