Metadata.Retry.Backoff does not take effect in multiple goroutines

[Stephan14]

Versions

Please specify real version numbers or git SHAs, not just "Latest" since that changes fairly regularly.

Sarama	Kafka	Go
Version 1.26.4 (2020-05-19)	0.10.1	1.14

Configuration

What configuration values are you using for Sarama and Kafka?

default config

Logs

When filing an issue please provide logs from Sarama and Kafka if at all
possible. You can set sarama.Logger to a log.Logger to capture Sarama debug
output.

logs: CLICK ME

Problem Description

When client gets metadata failed in multiple goroutines, client will retry get metadata in each goroutines after Metadata.Retry.Backoff, and each goroutine does not know other goroutines are sending metadata request

[ghost]

Thank you for taking the time to raise this issue. However, it has not had any activity on it in the past 90 days and will be closed in 30 days if no updates occur.
Please check if the master branch has already resolved the issue since it was raised. If you believe the issue is still valid and you would like input from the maintainers then please comment to ask for it to be reviewed.