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author | Alvin Richards <alvin@10gen.com> | 2010-10-06 16:08:34 -0400 |
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committer | Alvin Richards <alvin@10gen.com> | 2010-10-06 16:08:34 -0400 |
commit | ddb16cb7e47806406592a49155e223f5132fd993 (patch) | |
tree | 6805ca54fcb220e907f6b386ea29eb53103b8402 /jstests/sharding/limit_push.js | |
parent | b372e20ec85ae4fa9100942c8829501c1737d5be (diff) | |
download | mongo-ddb16cb7e47806406592a49155e223f5132fd993.tar.gz |
Added jstest for http://jira.mongodb.org/browse/SERVER-1896
Diffstat (limited to 'jstests/sharding/limit_push.js')
-rw-r--r-- | jstests/sharding/limit_push.js | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/jstests/sharding/limit_push.js b/jstests/sharding/limit_push.js new file mode 100644 index 00000000000..c77fee4c842 --- /dev/null +++ b/jstests/sharding/limit_push.js @@ -0,0 +1,54 @@ +// This test is to ensure that limit() clauses are pushed down to the shards and evaluated +// See: http://jira.mongodb.org/browse/SERVER-1896 + +doTest = function( ) { + + s = new ShardingTest( "limit_push", 2, 1, 1 ); + + db = s.getDB( "test" ); + + // Create some data + for (i=0; i < 100; i++) { db.limit_push.insert({ _id : i, x: i}); } + db.limit_push.ensureIndex( { x : 1 } ); + assert.eq( 100 , db.limit_push.find().length() , "Incorrect number of documents" ); + + // Shard the collection + s.adminCommand( { enablesharding : "test" } ); + s.adminCommand( { shardcollection : "test.limit_push" , key : { x : 1 } } ); + + // Now split the and move the data between the shards + s.adminCommand( { split : "test.limit_push", middle : { x : 50 }} ); + s.adminCommand( { moveChunk: "test.limit_push", find : { x : 51}, to : "shard0000" }) + + // Check that the chunck have split correctly + assert.eq( 2 , s.config.chunks.count() , "wrong number of chunks"); + + // The query is asking for the maximum value below a given value + // db.limit_push.find( { x : { $lt : 60} } ).sort( { x:-1} ).limit(1) + q = { x : { $lt : 60} }; + + // Make sure the basic queries are correct + assert.eq( 60 , db.limit_push.find( q ).count() , "Did not find 60 documents" ); + //rs = db.limit_push.find( q ).sort( { x:-1} ).limit(1) + //assert.eq( rs , { _id : "1" , x : 59 } , "Did not find document with value 59" ); + + // Now make sure that the explain shos that each shard is returning a single document as indicated + // by the "n" element for each shard + exp = db.limit_push.find( q ).sort( { x:-1} ).limit(1).explain(); + + assert.eq("ParallelSort", exp.clusteredType, "Not a ParallelSort"); + + var k = 0; + for (var j in exp.shards) { + assert.eq( 1 , exp.shards[j][0].n, "'n' is not 1 from shard000" + k.toString()); + k++ + } + + s.stop(); + +} + +// Uncomment this when the bug is fixed +// doTest(); + + |