feature compatibility version writes must check for writeErrors

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    • Fully Compatible
    • ALL
    • v3.4
    • Query 2017-10-23
    • None
    • 3
    • None
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      Here: https://github.com/mongodb/mongo/blob/c617c3efabb7ee6da6ec66fe9f585dfaeed631df/src/mongo/db/commands/feature_compatibility_version.cpp#L327-L332 we have:

          // Update the featureCompatibilityVersion document stored in the "admin.system.version"
    // collection.
    BSONObj updateResult;
    client.runCommand(nss.db().toString(), updateCmd.obj(), updateResult);
    uassertStatusOK(getStatusFromCommandResult(updateResult));
    uassertStatusOK(getWriteConcernStatusFromCommandResult(updateResult));

      Since this is doing an update, it can return a status like the following with ok:1 but a write error indicating that we should fail: 

      { n: 0, nModified: 0, writeErrors: [ { index: 0, code: 62, errmsg: "Must be in primary or secondary state to downgrade feature compatibility version document { _id: "featureCompatibilityVersion", version: "3.4", targetV..." } ], ok: 1.0 }

            Assignee:
            Tess Avitabile (Inactive)
            Reporter:
            Judah Schvimer
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              Created:
              Updated:
              Resolved: