59 lines
2.2 KiB
JavaScript
59 lines
2.2 KiB
JavaScript
// Tests that the replica set's term increases once per election, and persists across a restart of
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// the entire set.
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//
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// If all data-bearing nodes in a replica set are using an ephemeral storage engine, the set will
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// not be able to survive a scenario where all data-bearing nodes are down simultaneously. In such a
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// scenario, none of the members will have any replica set configuration document after a restart,
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// so cannot elect a primary. This test induces such a scenario, so cannot be run on ephemeral
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// storage engines.
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// @tags: [requires_persistence]
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import {ReplSetTest} from "jstests/libs/replsettest.js";
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import {getLatestOp} from "jstests/replsets/rslib.js";
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function getCurrentTerm(primary) {
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let res = primary.adminCommand({replSetGetStatus: 1});
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assert.commandWorked(res);
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return res.term;
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}
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let name = "restore_term";
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let rst = new ReplSetTest({name: name, nodes: 2});
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rst.startSet();
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rst.initiate();
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rst.awaitSecondaryNodes();
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let primary = rst.getPrimary();
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let primaryColl = primary.getDB("test").coll;
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// Current term may be greater than 1 if election race happens.
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let firstSuccessfulTerm = getCurrentTerm(primary);
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assert.gte(firstSuccessfulTerm, 1);
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assert.commandWorked(primaryColl.insert({x: 1}, {writeConcern: {w: "majority"}}));
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assert.eq(getCurrentTerm(primary), firstSuccessfulTerm);
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// Check that the insert op has the initial term.
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let latestOp = getLatestOp(primary);
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assert.eq(latestOp.op, "i");
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assert.eq(latestOp.t, firstSuccessfulTerm);
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// Step down to increase the term.
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assert.commandWorked(primary.adminCommand({replSetStepDown: 0}));
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rst.awaitSecondaryNodes();
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// The secondary became the new primary now with a higher term.
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// Since there's only one secondary who may run for election, the new term is higher by 1.
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assert.eq(getCurrentTerm(rst.getPrimary()), firstSuccessfulTerm + 1);
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// Restart the replset and verify the term is the same.
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rst.stopSet(null /* signal */, true /* forRestart */);
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rst.startSet({restart: true});
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rst.awaitSecondaryNodes();
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primary = rst.getPrimary();
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assert.eq(primary.getDB("test").coll.find().itcount(), 1);
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// After restart, the new primary stands up with the newer term.
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assert.gte(getCurrentTerm(primary), firstSuccessfulTerm + 1);
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rst.stopSet();
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