On my Mac,`brew services start mongodb-community@4.2` starts mongod process in unknown port

[steevej (Steeve Juneau)]

@Big_Cat_Public_Safety_Act

2022-08-17T10:55:27.166-0500 E  STORAGE  [initandlisten] WiredTiger error (-31802) [1660751727:166653][30240:0x20969b600], connection: __log_open_verify, 925: unsupported WiredTiger file version: this build only supports versions up to 4, and the file is version 5: WT_ERROR: non-specific WiredTiger error Raw: [1660751727:166653][30240:0x20969b600], connection: __log_open_verify, 925: unsupported WiredTiger file version: this build only supports versions up to 4, and the file is version 5: WT_ERROR: non-specific WiredTiger error
2022-08-17T10:55:27.219-0500 E  STORAGE  [initandlisten] WiredTiger error (-31802) [1660751727:219207][30240:0x20969b600], connection: __log_open_verify, 925: unsupported WiredTiger file version: this build only supports versions up to 4, and the file is version 5: WT_ERROR: non-specific WiredTiger error Raw: [1660751727:219207][30240:0x20969b600], connection: __log_open_verify, 925: unsupported WiredTiger file version: this build only supports versions up to 4, and the file is version 5: WT_ERROR: non-specific WiredTiger error
2022-08-17T10:55:27.243-0500 E  STORAGE  [initandlisten] WiredTiger error (-31802) [1660751727:243834][30240:0x20969b600], connection: __log_open_verify, 925: unsupported WiredTiger file version: this build only supports versions up to 4, and the file is version 5: WT_ERROR: non-specific WiredTiger error Raw: [1660751727:243834][30240:0x20969b600], connection: __log_open_verify, 925: unsupported WiredTiger file version: this build only supports versions up to 4, and the file is version 5: WT_ERROR: non-specific WiredTiger error
2022-08-17T10:55:27.278-0500 E  STORAGE  [initandlisten] WiredTiger error (-31802) [1660751727:278461][30240:0x20969b600], connection: __log_open_verify, 925: unsupported WiredTiger file version: this build only supports versions up to 4, and the file is version 5: WT_ERROR: non-specific WiredTiger error Raw: [1660751727:278461][30240:0x20969b600], connection: __log_open_verify, 925: unsupported WiredTiger file version: this build only supports versions up to 4, and the file is version 5: WT_ERROR: non-specific WiredTiger error
2022-08-17T10:55:27.315-0500 E  STORAGE  [initandlisten] WiredTiger error (-31802) [1660751727:315348][30240:0x20969b600], connection: __log_open_verify, 925: unsupported WiredTiger file version: this build only supports versions up to 4, and the file is version 5: WT_ERROR: non-specific WiredTiger error Raw: [1660751727:315348][30240:0x20969b600], connection: __log_open_verify, 925: unsupported WiredTiger file version: this build only supports versions up to 4, and the file is version 5: WT_ERROR: non-specific WiredTiger error

It looks like you had a more recent version of mongod using the same data directory.

I see 3 ways out:

1 - If the data that is there IS IMPORTANT, install and run a 5.x version rather than 4.2

or

2 - If the data that is there IS IMPORTANT and you MUST run 4.2,

• make a backup of the data directory for later retrieval
• create a new directory /opt/homebrew/var/mongodb-4.2
• change the configuration file to reflect the new dbPath

or

3 - If the data that is there IS NOT IMPORTANT and you must run 4.2

• make a backup of the data directory for later retrieval just in case the data is more important than you thought
• rename /opt/homebrew/var/mongodb to /opt/homebrew/var/mongodb-5.x
• creaet a new directory /opt/homebrew/var/mongodb/