3db9d1338c
No functional changes, just converting everything to use the JSON-based constructor. Also moves some sharding-specific tests out of noPassthroughWithMongod and under the sharding suite.
52 lines
2.0 KiB
JavaScript
52 lines
2.0 KiB
JavaScript
// This test is to ensure that limit() clauses are pushed down to the shards and evaluated
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// See: http://jira.mongodb.org/browse/SERVER-1896
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(function() {
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var s = new ShardingTest({ name: "limit_push", shards: 2, mongos: 1 });
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var db = s.getDB( "test" );
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// Create some data
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for (i=0; i < 100; i++) { db.limit_push.insert({ _id : i, x: i}); }
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db.limit_push.ensureIndex( { x : 1 } );
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assert.eq( 100 , db.limit_push.find().length() , "Incorrect number of documents" );
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// Shard the collection
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s.adminCommand( { enablesharding : "test" } );
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s.ensurePrimaryShard('test', 'shard0001');
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s.adminCommand( { shardcollection : "test.limit_push" , key : { x : 1 } } );
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// Now split the and move the data between the shards
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s.adminCommand( { split : "test.limit_push", middle : { x : 50 }} );
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s.adminCommand( { moveChunk: "test.limit_push", find : { x : 51}, to : s.getOther( s.getServer( "test" ) ).name, _waitForDelete : true })
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// Check that the chunck have split correctly
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assert.eq( 2 , s.config.chunks.count() , "wrong number of chunks");
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// The query is asking for the maximum value below a given value
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// db.limit_push.find( { x : { $lt : 60} } ).sort( { x:-1} ).limit(1)
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q = { x : { $lt : 60} };
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// Make sure the basic queries are correct
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assert.eq( 60 , db.limit_push.find( q ).count() , "Did not find 60 documents" );
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//rs = db.limit_push.find( q ).sort( { x:-1} ).limit(1)
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//assert.eq( rs , { _id : "1" , x : 59 } , "Did not find document with value 59" );
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// Now make sure that the explain shos that each shard is returning a single document as indicated
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// by the "n" element for each shard
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exp = db.limit_push.find( q ).sort( { x:-1} ).limit(1).explain("executionStats");
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printjson( exp )
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var execStages = exp.executionStats.executionStages;
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assert.eq("SHARD_MERGE_SORT", execStages.stage, "Expected SHARD_MERGE_SORT as root stage");
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var k = 0;
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for (var j in execStages.shards) {
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assert.eq( 1 , execStages.shards[j].executionStages.nReturned,
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"'n' is not 1 from shard000" + k.toString());
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k++
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}
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s.stop();
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})();
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