75 lines
2.3 KiB
JavaScript
75 lines
2.3 KiB
JavaScript
// Test basic read committed functionality.
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(function() {
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"use strict";
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// Set up a set and grab things for later.
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var name = "read_committed";
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var replTest = new ReplSetTest({name: name,
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nodes: 3,
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nodeOptions: {enableMajorityReadConcern: ''}});
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var nodes = replTest.nodeList();
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try {
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replTest.startSet();
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} catch (e) {
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var conn = MongoRunner.runMongod();
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if (!conn.getDB('admin').serverStatus().storageEngine.supportsCommittedReads) {
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jsTest.log("skipping test since storage engine doesn't support committed reads");
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MongoRunner.stopMongod(conn);
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return;
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}
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throw e;
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}
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replTest.initiate({"_id": name,
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"members": [
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{ "_id": 0, "host": nodes[0] },
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{ "_id": 1, "host": nodes[1], priority: 0 },
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{ "_id": 2, "host": nodes[2], arbiterOnly: true}]
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});
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// Get connections and collection.
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var primary = replTest.getPrimary();
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var secondary = replTest.liveNodes.slaves[0];
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var secondaryId = replTest.getNodeId(secondary);
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var db = primary.getDB(name);
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var t = db[name];
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function doDirtyRead() {
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var res = t.runCommand('find', {"readConcern": {"level": "local"}});
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assert.commandWorked(res);
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return new DBCommandCursor(db.getMongo(), res).toArray()[0].state;
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}
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function doCommittedRead() {
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var res = t.runCommand('find', {"readConcern": {"level": "majority"}});
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assert.commandWorked(res);
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return new DBCommandCursor(db.getMongo(), res).toArray()[0].state;
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}
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// Do a write, wait for it to replicate, and ensure it is visible.
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assert.writeOK(t.save({_id: 1, state: 0}, {writeConcern: {w: "majority", wtimeout: 60*1000}}));
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assert.eq(doDirtyRead(), 0);
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assert.eq(doCommittedRead(), 0);
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replTest.stop(secondaryId);
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// Do a write and ensure it is only visible to dirty reads
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assert.writeOK(t.save({_id: 1, state: 1}));
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assert.eq(doDirtyRead(), 1);
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assert.eq(doCommittedRead(), 0);
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// Try the committed read again after sleeping to ensure it doesn't only work for queries
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// immediately after the write.
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sleep(1000);
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assert.eq(doCommittedRead(), 0);
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// Restart the node and ensure the committed view is updated.
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replTest.restart(secondaryId);
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db.getLastError("majority", 60 * 1000);
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assert.eq(doDirtyRead(), 1);
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assert.eq(doCommittedRead(), 1);
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}());
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