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As an alternative, use the $planCacheStats aggregation stage. This metadata source, when placed first in the pipeline, returns one document per plan cache entry for a particular collection. This data can then be filtered, projected, grouped, or otherwise processed with the full power of MQL.
63 lines
2.3 KiB
JavaScript
63 lines
2.3 KiB
JavaScript
// Verify that the plan cache and index filter commands can be run on secondaries, but only
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// if slave ok is explicitly set.
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var name = "plan_cache_slaveok";
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function assertPlanCacheCommandsSucceed(db) {
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assert.commandWorked(db.runCommand({planCacheClear: name, query: {a: 1}}));
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// Using aggregate to list the contents of the plan cache.
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assert.commandWorked(
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db.runCommand({aggregate: name, pipeline: [{$planCacheStats: {}}], cursor: {}}));
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assert.commandWorked(
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db.runCommand({planCacheSetFilter: name, query: {a: 1}, indexes: [{a: 1}]}));
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assert.commandWorked(db.runCommand({planCacheListFilters: name}));
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assert.commandWorked(db.runCommand({planCacheClearFilters: name, query: {a: 1}}));
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}
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function assertPlanCacheCommandsFail(db) {
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assert.commandFailed(db.runCommand({planCacheClear: name, query: {a: 1}}));
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// Using aggregate to list the contents of the plan cache.
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assert.commandFailed(
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db.runCommand({aggregate: name, pipeline: [{$planCacheStats: {}}], cursor: {}}));
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assert.commandFailed(
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db.runCommand({planCacheSetFilter: name, query: {a: 1}, indexes: [{a: 1}]}));
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assert.commandFailed(db.runCommand({planCacheListFilters: name}));
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assert.commandFailed(db.runCommand({planCacheClearFilters: name, query: {a: 1}}));
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}
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print("Start replica set with two nodes");
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var replTest = new ReplSetTest({name: name, nodes: 2});
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var nodes = replTest.startSet();
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replTest.initiate();
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var primary = replTest.getPrimary();
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// Insert a document and let it sync to the secondary.
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print("Initial sync");
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primary.getDB("test")[name].insert({a: 1});
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replTest.awaitReplication();
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// Check that the document is present on the primary.
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assert.eq(1, primary.getDB("test")[name].findOne({a: 1})["a"]);
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// Make sure the plan cache commands succeed on the primary.
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assertPlanCacheCommandsSucceed(primary.getDB("test"));
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// With slave ok false, the commands should fail on the secondary.
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var secondary = replTest.getSecondary();
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secondary.getDB("test").getMongo().setSlaveOk(false);
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assertPlanCacheCommandsFail(secondary.getDB("test"));
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// With slave ok true, the commands should succeed on the secondary.
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secondary.getDB("test").getMongo().setSlaveOk(true);
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assertPlanCacheCommandsSucceed(secondary.getDB("test"));
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replTest.stopSet();
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