Details
Trivial - P5 Description
I launched a new mongod process with an empty database directory:
$ mongod --dbpath /tmp/db --replSet rs
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Upon accessing the mongod with the shell, I saw a blurb inviting me to run db.enableFreeMonitoring(). I happened to run this before rs.initiate() and was greeted with the following, unpleasant error:
$ mongo
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MongoDB shell version v4.0.0-rc5
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connecting to: mongodb://127.0.0.1:27017
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MongoDB server version: 4.0.0-rc5
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---
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Enable MongoDB's free cloud-based monitoring service to collect and display
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metrics about your deployment (disk utilization, CPU, operation statistics,
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etc).
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The monitoring data will be available on a MongoDB website with a unique
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URL created for you. Anyone you share the URL with will also be able to
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view this page. MongoDB may use this information to make product
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improvements and to suggest MongoDB products and deployment options to you.
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To enable free monitoring, run the following command:
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db.enableFreeMonitoring()
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---
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> db.enableFreeMonitoring()
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2018-06-15T13:00:32.014-0400 E QUERY [js] Error: command failed: {
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"operationTime" : Timestamp(0, 0),
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"ok" : 0,
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"errmsg" : "not master",
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"code" : 10107,
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"codeName" : "NotMaster",
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"$clusterTime" : {
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"clusterTime" : Timestamp(0, 0),
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"signature" : {
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"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
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"keyId" : NumberLong(0)
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}
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}
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} :
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_getErrorWithCode@src/mongo/shell/utils.js:25:13
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doassert@src/mongo/shell/assert.js:18:14
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_assertCommandWorked@src/mongo/shell/assert.js:534:17
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assert.commandWorked@src/mongo/shell/assert.js:618:16
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DB.prototype.enableFreeMonitoring@src/mongo/shell/db.js:1955:1
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@(shell):1:1
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>
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It may be trivial to improve the user experience here by having db.enableFreeMonitoring check that the active connection is a primary before attempting to run the setFreeMonitoring command.