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// Test drain mode when transitioning to PRIMARY
// 1. Set up a 3-node set.
// 2. Prevent applying retrieved ops on the SECONDARY.
// 3. Insert data to ensure the SECONDARY has ops to apply in its queue.
// 4. Shutdown PRIMARY.
// 5. Wait for SECONDARY to become PRIMARY.
// 6. Confirm that the new PRIMARY cannot accept writes until its queue is empty.
// 7. Enable applying ops.
// 8. Ensure the ops in queue are applied and that the PRIMARY begins to accept writes as usual.
(function () {
"use strict";
var replSet = new ReplSetTest({name: 'testSet', nodes: 3});
var nodes = replSet.nodeList();
replSet.startSet();
replSet.initiate({"_id" : "testSet",
"members" : [
{"_id" : 0, "host" : nodes[0]},
{"_id" : 1, "host" : nodes[1]},
{"_id" : 2, "host" : nodes[2], "arbiterOnly" : true}]});
var primary = replSet.getPrimary();
var secondary = replSet.getSecondary();
// Do an initial insert to prevent the secondary from going into recovery
var numDocuments = 20;
var bulk = primary.getDB("foo").foo.initializeUnorderedBulkOp();
var bigString = Array(1024*1024).toString();
assert.writeOK(primary.getDB("foo").foo.insert({ big: bigString}));
replSet.awaitReplication();
assert.commandWorked(
secondary.getDB("admin").runCommand({
configureFailPoint: 'rsSyncApplyStop',
mode: 'alwaysOn'}),
'failed to enable fail point on secondary');
var bufferCountBefore = secondary.getDB('foo').serverStatus().metrics.repl.buffer.count;
for (var i = 1; i < numDocuments; ++i) {
bulk.insert({ big: bigString});
}
assert.writeOK(bulk.execute());
jsTestLog('Number of documents inserted into collection on primary: ' + numDocuments);
assert.eq(numDocuments, primary.getDB("foo").foo.count());
assert.soon(function() {
var serverStatus = secondary.getDB('foo').serverStatus();
var bufferCount = serverStatus.metrics.repl.buffer.count;
var bufferCountChange = bufferCount - bufferCountBefore;
jsTestLog('Number of operations buffered on secondary since stopping applier: ' +
bufferCountChange);
return bufferCountChange >= numDocuments - 1;
}, 'secondary did not buffer operations for new inserts on primary', 30000, 1000);
// Kill primary; secondary will enter drain mode to catch up
primary.getDB("admin").shutdownServer({force:true});
replSet.waitForState(secondary, replSet.PRIMARY, 30000);
// Ensure new primary is not yet writable
jsTestLog('New primary should not be writable yet');
assert.writeError(secondary.getDB("foo").flag.insert({sentinel:2}));
assert(!secondary.getDB("admin").runCommand({"isMaster": 1}).ismaster);
// Allow draining to complete
jsTestLog('Enabling fail point on new primary to allow draining to complete');
assert.commandWorked(
secondary.getDB("admin").runCommand({configureFailPoint: 'rsSyncApplyStop', mode: 'off'}),
'failed to disable fail point on new primary');
primary = replSet.getPrimary();
// Ensure new primary is writable
jsTestLog('New primary should be writable after draining is complete');
assert.writeOK(primary.getDB("foo").flag.insert({sentinel:1}));
// Check for at least two entries. There was one prior to freezing op application on the
// secondary and we cannot guarantee all writes reached the secondary's op queue prior to
// shutting down the original primary.
assert.gte(primary.getDB("foo").foo.count(), 2);
})();
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