GitHub user ShadowySpirits added a comment to the discussion: updateSubGroup
command set retryPolicy raise JSON Exception
Please add quotation marks around your JSON string and include the `-c` option.
```bash
./mqadmin updateSubGroup -n localhost:9876 -g system -p
'{"type":"EXPONENTIAL","exponentialRetryPolicy":{"initial":5000,"max":7200000,"multiplier":2}}'
-c <your-cluster-name>
```
GitHub link:
https://github.com/apache/rocketmq/discussions/6425#discussioncomment-5377187
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