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/* test removing a node from a replica set
*
* Start set with two nodes
* Initial sync
* Remove secondary
* Bring secondary back up
* Add it back as secondary
* Make sure both nodes are either primary or secondary
*/
load("jstests/replsets/rslib.js");
var name = "removeNodes";
var host = getHostName();
print("Start set with two nodes");
var replTest = new ReplSetTest( {name: name, nodes: 2} );
var nodes = replTest.startSet();
replTest.initiate();
var master = replTest.getMaster();
print("Initial sync");
master.getDB("foo").bar.baz.insert({x:1});
replTest.awaitReplication();
print("Remove secondary");
var config = replTest.getReplSetConfig();
config.members.pop();
config.version = 2;
assert.eq(replTest.nodes[1].getDB("admin").runCommand({ping:1}).ok, 1, "we are connected to node[1]");
try {
master.getDB("admin").runCommand({replSetReconfig:config});
}
catch(e) {
print(e);
}
// This test that nodes[1] disconnects us when it picks up the new config
assert.soon(
function() {
try {
replTest.nodes[1].getDB("admin").runCommand({ping:1});
} catch (e) {
return true;
}
return false;
}
);
// Now we should successfully reconnect to nodes[1]
assert.eq(replTest.nodes[1].getDB("admin").runCommand({ping:1}).ok, 1,
"we are connected to node[1]");
reconnect(master);
assert.soon(function() {
var c = master.getDB("local").system.replset.findOne();
return c.version == 2;
});
print("Add it back as a secondary");
config.members.push({_id:1, host : host+":"+replTest.getPort(1)});
config.version = 3;
printjson(config);
wait(function() {
try {
master.getDB("admin").runCommand({replSetReconfig:config});
}
catch(e) {
print(e);
}
// master will likely step down (and close all connections) sometime after the reconfig if it
// thinks the newly re-added secondary is down. So wait for that then reconnect the connection
// we are using.
replTest.awaitReplication();
reconnect(master);
printjson(master.getDB("admin").runCommand({replSetGetStatus:1}));
master.setSlaveOk();
var newConfig = master.getDB("local").system.replset.findOne();
print( "newConfig: " + tojson(newConfig) );
return newConfig.version == 3;
} , "wait1" );
print("Make sure both nodes are either primary or secondary");
wait(function() {
var status = master.getDB("admin").runCommand({replSetGetStatus:1});
occasionally(function() {
printjson(status);
});
if (!status.members || status.members.length != 2) {
return false;
}
for (var i = 0; i<2; i++) {
if (status.members[i].state != 1 && status.members[i].state != 2) {
return false;
}
}
return true;
} , "wait2" );
print("reconfig with minority");
replTest.stop(1);
assert.soon(function() {
try {
return master.getDB("admin").runCommand({isMaster : 1}).secondary;
}
catch(e) {
print("trying to get master: "+e);
}
},"waiting for primary to step down",(60*1000),1000);
config.version = 4;
config.members.pop();
try {
master.getDB("admin").runCommand({replSetReconfig : config, force : true});
}
catch(e) {
print(e);
}
reconnect(master);
assert.soon(function() {
return master.getDB("admin").runCommand({isMaster : 1}).ismaster;
},"waiting for old primary to accept reconfig and step up",(60*1000),1000);
config = master.getDB("local").system.replset.findOne();
printjson(config);
assert.gt(config.version, 4);
replTest.stopSet();
|
