Can zero receive a large number of concurrent requests？Error in oracle delta stream. Error: rpc error: code = Canceled desc = context canceled

Users Dgraph
1

Dgraph : v21.03.2
Can zero receive a large number of concurrent requests？

When I request 2000 golang dgraph clients at the same time, an error will be reported:

 | I0923 07:27:26.107110      21 groups.go:974] Zero leadership changed. Renewing oracle delta stream.
alpha | E0923 07:27:26.114641      21 groups.go:950] Error in oracle delta stream. Error: rpc error: code = Canceled desc = context canceled
alpha | I0923 07:27:27.055365      21 groups.go:906] Leader idx=0x1 of group=1 is connecting to Zero for txn updates
alpha | I0923 07:27:27.057208      21 groups.go:918] Got Zero leader: zero:5080
alpha | I0923 07:27:45.545474      21 groups.go:974] Zero leadership changed. Renewing oracle delta stream.
alpha | E0923 07:27:45.546338      21 groups.go:950] Error in oracle delta stream. Error: rpc error: code = Canceled desc = context canceled
zero | I0923 07:27:52.145471      22 raft.go:779] Skipping creating a snapshot. Num groups: 1, Num checkpoints: 0
alpha | I0923 07:27:54.369813      21 groups.go:656] No healthy Zero leader found. Trying to find a Zero leader...
zero | I0923 07:27:54.526362      22 zero.go:445] Got connection request: cluster_info_only:true
zero | I0923 07:27:54.526847      22 zero.go:470] Connected: cluster_info_only:true
alpha | I0923 07:27:54.601908      21 groups.go:702] Found connection to leader: zero:5080
alpha | I0923 07:27:54.756200      21 groups.go:656] No healthy Zero leader found. Trying to find a Zero leader...
alpha | I0923 07:27:54.756414      21 groups.go:906] Leader idx=0x1 of group=1 is connecting to Zero for txn updates
alpha | I0923 07:27:54.757984      21 groups.go:656] No healthy Zero leader found. Trying to find a Zero leader...
zero | I0923 07:27:55.006103      22 zero.go:445] Got connection request: cluster_info_only:true
zero | I0923 07:27:55.007376      22 zero.go:470] Connected: cluster_info_only:true
zero | I0923 07:27:55.008304      22 zero.go:445] Got connection request: cluster_info_only:true
zero | I0923 07:27:55.009045      22 zero.go:470] Connected: cluster_info_only:true
alpha | I0923 07:27:55.091298      21 groups.go:702] Found connection to leader: zero:5080
alpha | I0923 07:27:55.091722      21 groups.go:918] Got Zero leader: zero:5080
alpha | I0923 07:27:55.164677      21 groups.go:702] Found connection to leader: zero:5080
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Share details of your deployment. And computer/cloud stats.

3

I’m seeing this error in my logs and am experiencing some issues related to the database in question. Should I use this issue or open a new one?

4

New one, with more details. Cuz those logs can be anything.

In the previous case could be not having enough resources for 2k clients.

Any application one must analyze how much resource it will consume. DBs cannot do miracles. If the error is from the DB, it’s always important to provide context in the report.