07c0c80e19
The topology coordinator needs to track two distinct notions of a node not being willing to stand for election. The first is that of the step-down period. During the step down period, the node will not stand for election due to the step-down command being issued. In heartbeat responses, nodes in the step down period should report that they are not electable. The second notion is that of the post election sleep period. If a node loses an election, it declines to stand again for a brief period of time (1 second plus a random interval), to avert problems related to ties. During this period, its heartbeat responses should still report the node is electable, to suppress the election of lower priority nodes.
45 lines
1.5 KiB
JavaScript
45 lines
1.5 KiB
JavaScript
// should check that election happens in priority order
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(function() {
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"use strict";
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var replTest = new ReplSetTest( {name: 'testSet', nodes: 3} );
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var nodenames = replTest.nodeList();
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var nodes = replTest.startSet();
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replTest.initiate({"_id" : "testSet",
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"members" : [
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{"_id" : 0, "host" : nodenames[0], "priority" : 1},
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{"_id" : 1, "host" : nodenames[1], "priority" : 2},
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{"_id" : 2, "host" : nodenames[2], "priority" : 3}]});
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// 2 should be master (give this a while to happen, as 0 will be elected, then demoted)
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replTest.waitForState(nodes[2], replTest.PRIMARY, 120000);
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// kill 2, 1 should take over
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replTest.stop(2);
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// 1 should eventually be master
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replTest.waitForState(nodes[1], replTest.PRIMARY, 60000);
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// do some writes on 1
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var master = replTest.getMaster();
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for (var i=0; i<1000; i++) {
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master.getDB("foo").bar.insert({i:i});
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}
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for (i=0; i<1000; i++) {
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master.getDB("bar").baz.insert({i:i});
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}
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// bring 2 back up, 2 should wait until caught up and then become master
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replTest.restart(2);
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replTest.waitForState(nodes[2], replTest.PRIMARY, 60000);
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// make sure nothing was rolled back
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master = replTest.getMaster();
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for (i=0; i<1000; i++) {
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assert(master.getDB("foo").bar.findOne({i:i}) != null, 'checking '+i);
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assert(master.getDB("bar").baz.findOne({i:i}) != null, 'checking '+i);
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}
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}());
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