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Backwards Compatibility:
Minor Change
Operating System:
ALL
Steps To Reproduce:
Hide

Start up a replica set in version 2.4, with this config:

{ "_id" : "config-test", "version" : 2, "members" : [ { "_id" : 0, "host" : "charlie-macbook-pro:41000" }, { "_id" : 1, "host" : "charlie-macbook-pro:41001", "votes" : 2 } ] }

then re-config to add a 2.8 node, resulting in this config:

{ "_id" : "config-test", "version" : 3, "members" : [ { "_id" : 0, "host" : "charlie-macbook-pro:41000" }, { "_id" : 1, "host" : "charlie-macbook-pro:41001", "votes" : 2 }, { "_id" : 2, "host" : "charlie-macbook-pro:41002" } ] }

The 2.8 host remains in 'STARTUP' mode, but without any error messages besides the one mentioned below.
Show
Start up a replica set in version 2.4, with this config: { "_id" : "config-test", "version" : 2, "members" : [ { "_id" : 0, "host" : "charlie-macbook-pro:41000" }, { "_id" : 1, "host" : "charlie-macbook-pro:41001", "votes" : 2 } ] } then re-config to add a 2.8 node, resulting in this config: { "_id" : "config-test", "version" : 3, "members" : [ { "_id" : 0, "host" : "charlie-macbook-pro:41000" }, { "_id" : 1, "host" : "charlie-macbook-pro:41001", "votes" : 2 }, { "_id" : 2, "host" : "charlie-macbook-pro:41002" } ] } The 2.8 host remains in 'STARTUP' mode, but without any error messages besides the one mentioned below.
Confidence Status:
None
Work Order:
0

When there is an invalid config for a replica set in version 2.4, when a 2.8 member is added, the 2.8 member simply logs

2014-11-11T09:57:11.015-0500 I REPLSETS [rsSync] replSet warning did not receive a valid config yet, sleeping 5 seconds

Over and over again, without any error message.

Confirmed that the same thing happens when mixing 2.6 and 2.8. So it's not specific to 2.4.