How to check if the current mongodb has WiredTiger storage engine enabled?
It can be verified by at least the following 2 methods:
1. Run the following command on Linux/OSX
If it returns 1, it means that a mongod with WiredTiger as the storage engine is running in the current system
2. Run the following command on Linux/OSX
If the return message contains wiredTiger, the mongo is connected to a mongod with the wiredTiger storage engine enabled.
Note forAlreadyWiredTiger's file path – dbpath is enabled and can no longer be opened using the default mmapv1 storage engineFor example:
ac:mongodata maclean$ mongod --storageEngine wiredTiger --dbpath /Users/maclean/mongodata
2015-05-06T11:35:32.372+0800 I STORAGE [initandlisten] wiredtiger_open config: create,cache_size=4G,session_max=20000,eviction=(threads_max=4),statistics=(fast),log=( enabled=true,archive=true,path=journal,compressor=snappy),checkpoint=(wait=60,log_size=2GB),statistics_log=(wait=0),
2015-05-06T11:35:32.997+0800 I CONTROL [initandlisten] MongoDB starting : pid=16590 port=27017 dbpath=/Users/maclean/mongodata 64-bit host=ac.local
2015-05-06T11:35:32.998+0800 I CONTROL [initandlisten] db version v3.0.2
2015-05-06T11:35:32.998+0800 I CONTROL [initandlisten] git version: nogitversion
2015-05-06T11:35:32.998+0800 I CONTROL [initandlisten] build info: Darwin yosemitevm.local 14.3.0 Darwin Kernel Version 14.3.0: Mon Mar 23 11:59:05 PDT 2015; root:xnu-2782.20.48~5/RELEASE_X86_64 x86_64 BOOST_LIB_VERSION=1_49
2015-05-06T11:35:32.998+0800 I CONTROL [initandlisten] allocator: system
2015-05-06T11:35:32.999+0800 I CONTROL [initandlisten] options: { storage: { dbPath: "/Users/maclean/mongodata", engine: "wiredTiger" } }
2015-05-06T11:35:33.045+0800 I NETWORK [initandlisten] waiting for connections on port 27017
If --storageEngine wiredTiger is enabled as above, it will work normally
If you use the mmapv1 engine, an error will be reported
ac:mongodata maclean$ mongod --storageEngine mmapv1 --dbpath /Users/maclean/mongodata
2015-05-06T11:36:34.037+0800 I STORAGE [initandlisten] exception in initAndListen: 28574 Cannot start server. Detected data files in /Users/maclean/mongodata created by storage engine 'wiredTiger'. The configured storage engine is 'mmapv1'., terminating
2015-05-06T11:36:34.037+0800 I CONTROL [initandlisten] dbexit: rc: 100
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Posted on 10/8/2016 11:14:08 AM
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