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lease: ensure grant/revoke won't be applied repeatedly after restarting etcd #11935

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merged 2 commits into from May 31, 2020
Merged

lease: ensure grant/revoke won't be applied repeatedly after restarting etcd #11935

merged 2 commits into from May 31, 2020

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tangcong
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Consider the following scenario:

etcdctl lease grant 10
lease 3269723c5a733e05 granted with TTL(10s)
etcdctl lease grant 15
lease 3269723c5a733e07 granted with TTL(15s)
restart etcd

we can see some error log:

20:27:54 etcd1 | {"level":"warn","ts":"2020-05-22T20:27:54.599+0800","caller":"etcdserver/util.go:120","msg":"failed to apply request","took":"35.702µs","request":"header:<ID:3632560177992121862 > lease_grant:<ttl:10-second id:3269723c5a733e05>","response":"size:0","error":"lease already exists"}
20:27:54 etcd1 | {"level":"warn","ts":"2020-05-22T20:27:54.599+0800","caller":"etcdserver/util.go:120","msg":"failed to apply request","took":"5.126µs","request":"header:<ID:3632560177992121864 > lease_grant:<ttl:15-second id:3269723c5a733e07>","response":"size:0","error":"lease already exists"}

this pr make sure that lease grant and revoke can only be executed once under any circumstances.

@tangcong
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@jingyih @gyuho Please take a look. Thanks

gyuho
gyuho approved these changes May 31, 2020
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lgtm, thx for the improvements!

@gyuho gyuho merged commit 8af52dc into etcd-io:master May 31, 2020
tedyu
tedyu reviewed May 31, 2020
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etcdserver/server.go
@@ -523,7 +523,9 @@ func NewServer(cfg ServerConfig) (srv *EtcdServer, err error) {
MinLeaseTTL: int64(math.Ceil(minTTL.Seconds())),
CheckpointInterval: cfg.LeaseCheckpointInterval,
ExpiredLeasesRetryInterval: srv.Cfg.ReqTimeout(),
})
},
srv.consistIndex,
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I know the field was an existing field, it seems naming the field consistentIndex is more intuitive.

@tangcong tangcong deleted the save-cindex-for-lease branch February 26, 2021 18:59
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@tedyu tedyu tedyu left review comments

@gyuho gyuho gyuho approved these changes

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@tangcong @tedyu @gyuho