MongoDB-Community not starting on Mac and giving errors

Question

I am writing to inform that i had installed mongodb-community some time back using brew (High Sierra) and it was running. Then recently i upgraded and it doesn't seem to wire up. When i am running mongo in terminal, I am getting error:

MongoDB shell version v4.4.0
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed: SocketException: Error connecting to 127.0.0.1:27017 :: caused by :: Connection refused :
connect@src/mongo/shell/mongo.js:362:17
@(connect):2:6
exception: connect failed
exiting with code 1

When i checked logs for starting the mongodb-community service, I am getting following error:

{"t":{"$date":"2020-09-04T21:01:35.015-07:00"},"s":"W",  "c":"CONTROL",  "id":20698,   "ctx":"main","msg":"***** SERVER RESTARTED *****","tags":["startupWarnings"]}
{"t":{"$date":"2020-09-04T21:01:35.021-07:00"},"s":"I",  "c":"CONTROL",  "id":23285,   "ctx":"main","msg":"Automatically disabling TLS 1.0, to force-enable TLS 1.0 specify --sslDisabledProtocols 'none'"}
{"t":{"$date":"2020-09-04T21:01:35.027-07:00"},"s":"W",  "c":"ASIO",     "id":22601,   "ctx":"main","msg":"No TransportLayer configured during NetworkInterface startup"}
{"t":{"$date":"2020-09-04T21:01:35.027-07:00"},"s":"I",  "c":"NETWORK",  "id":4648602, "ctx":"main","msg":"Implicit TCP FastOpen in use."}
{"t":{"$date":"2020-09-04T21:01:35.028-07:00"},"s":"I",  "c":"STORAGE",  "id":4615611, "ctx":"initandlisten","msg":"MongoDB starting","attr":{"pid":58706,"port":27017,"dbPath":"/Users/my_username/homebrew/var/mongodb","architecture":"64-bit","host":"SC-*"}}
{"t":{"$date":"2020-09-04T21:01:35.029-07:00"},"s":"I",  "c":"CONTROL",  "id":23403,   "ctx":"initandlisten","msg":"Build Info","attr":{"buildInfo":{"version":"4.4.0","gitVersion":"563487e100c4215e2dce98d0af2a6a5a2d67c5cf","modules":[],"allocator":"system","environment":{"distarch":"x86_64","target_arch":"x86_64"}}}}
{"t":{"$date":"2020-09-04T21:01:35.029-07:00"},"s":"I",  "c":"CONTROL",  "id":51765,   "ctx":"initandlisten","msg":"Operating System","attr":{"os":{"name":"Mac OS X","version":"17.7.0"}}}
{"t":{"$date":"2020-09-04T21:01:35.029-07:00"},"s":"I",  "c":"CONTROL",  "id":21951,   "ctx":"initandlisten","msg":"Options set by command line","attr":{"options":{"config":"/Users/my_username/homebrew/etc/mongod.conf","net":{"bindIp":"127.0.0.1"},"storage":{"dbPath":"/Users/my_username/homebrew/var/mongodb"},"systemLog":{"destination":"file","logAppend":true,"path":"/Users/my_username/homebrew/var/log/mongodb/mongo.log"}}}}
{"t":{"$date":"2020-09-04T21:01:35.038-07:00"},"s":"I",  "c":"STORAGE",  "id":22270,   "ctx":"initandlisten","msg":"Storage engine to use detected by data files","attr":{"dbpath":"/Users/my_username/homebrew/var/mongodb","storageEngine":"wiredTiger"}}
{"t":{"$date":"2020-09-04T21:01:35.038-07:00"},"s":"I",  "c":"STORAGE",  "id":22315,   "ctx":"initandlisten","msg":"Opening WiredTiger","attr":{"config":"create,cache_size=7680M,session_max=33000,eviction=(threads_min=4,threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000,close_scan_interval=10,close_handle_minimum=250),statistics_log=(wait=0),verbose=[recovery_progress,checkpoint_progress,compact_progress],"}}
{"t":{"$date":"2020-09-04T21:01:36.177-07:00"},"s":"W",  "c":"STORAGE",  "id":22347,   "ctx":"initandlisten","msg":"Failed to start up WiredTiger under any compatibility version. This may be due to an unsupported upgrade or downgrade."}
{"t":{"$date":"2020-09-04T21:01:36.178-07:00"},"s":"F",  "c":"STORAGE",  "id":28595,   "ctx":"initandlisten","msg":"Terminating.","attr":{"reason":"45: Operation not supported"}}
{"t":{"$date":"2020-09-04T21:01:36.178-07:00"},"s":"F",  "c":"-",        "id":23091,   "ctx":"initandlisten","msg":"Fatal assertion","attr":{"msgid":28595,"file":"src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp","line":1100}}
{"t":{"$date":"2020-09-04T21:01:36.178-07:00"},"s":"F",  "c":"-",        "id":23092,   "ctx":"initandlisten","msg":"\n\n***aborting after fassert() failure\n\n"}

Can i please seek your help in fixing this? I am not having sudo rights and can't upgrade the OS, but am open to use mongo using any method

Answer 1

similar issue, final worked solution:

1. uninstall (latest, but not worked version: 4.4.3)

brew uninstall mongodb-community

2. reinstall, old but worked 4.2.1

brew install [email protected]

3. run

• for now: brew services run [email protected]
• for now and set bootable: brew services start [email protected]

4. check status

brew services

Answer 2

The log is telling you what is going on

"Failed to start up WiredTiger under any compatibility version. This may be due to an unsupported upgrade or downgrade."

So you may want to read documentation of your old mongoDB version to see if it is upgradeable to version 4.4.0, if it is not, consider upgrading to a most recent version that is compatible with the WiredTiger version you are currently using

This link might be useful. To upgrade to mongoDB v4.0 or above you must be running at least mongoDB v3.6, otherwise you will have to to upgrade to v3.6 first