From 7645618fd3914cb8a20561625913c20d49504a49 Mon Sep 17 00:00:00 2001
From: Antonin Kral <a.kral@bobek.cz>
Date: Wed, 11 Aug 2010 12:38:57 +0200
Subject: Imported Upstream version 1.6.0

---
 jstests/splitvector.js | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 jstests/splitvector.js

(limited to 'jstests/splitvector.js')

diff --git a/jstests/splitvector.js b/jstests/splitvector.js
new file mode 100644
index 0000000..8d86319
--- /dev/null
+++ b/jstests/splitvector.js
@@ -0,0 +1,81 @@
+// -------------------------
+//  SPLITVECTOR TEST UTILS
+// -------------------------
+
+// -------------------------
+// assertChunkSizes verifies that a given 'splitVec' divides the 'test.jstest_splitvector'
+// collection in 'maxChunkSize' approximately-sized chunks. Its asserts fail otherwise.
+// @param splitVec: an array with keys for field 'x'
+//        e.g. [ { x : 1927 }, { x : 3855 }, ...
+// @param numDocs: domain of 'x' field 
+//        e.g. 20000
+// @param maxChunkSize is in MBs.
+//
+assertChunkSizes = function ( splitVec , numDocs , maxChunkSize ){
+    splitVec = [{ x: -1 }].concat( splitVec );
+    splitVec.push( { x: numDocs+1 } );
+    for ( i=0; i<splitVec.length-1; i++) { 
+        min = splitVec[i];
+        max = splitVec[i+1];
+        size = db.runCommand( { datasize: "test.jstests_splitvector" , min: min , max: max } ).size;
+        
+        // It is okay for the last chunk to be  smaller. A collection's size does not
+        // need to be exactly a multiple of maxChunkSize.
+        if ( i < splitVec.length - 2 )
+            assert.close( maxChunkSize , size , "A"+i ,  -3 );
+        else
+            assert.gt( maxChunkSize, size, "A"+i );
+    }
+}
+
+
+// -------------------------
+//  TESTS START HERE
+// -------------------------
+
+f = db.jstests_splitvector;
+f.drop();
+
+// -------------------------
+// Case: missing paramters 
+
+assert.eq( false, db.runCommand( { splitVector: "test.jstests_splitvector" } ).ok );
+assert.eq( false, db.runCommand( { splitVector: "test.jstests_splitvector" , maxChunkSize: 1} ).ok );
+
+
+// -------------------------
+// Case: missing index
+
+assert.eq( false, db.runCommand( { splitVector: "test.jstests_splitvector" , keyPattern: {x:1} , maxChunkSize: 1 } ).ok );
+
+
+// -------------------------
+// Case: empty collection
+
+f.ensureIndex( { x: 1} );
+assert.eq( [], db.runCommand( { splitVector: "test.jstests_splitvector" , keyPattern: {x:1} , maxChunkSize: 1 } ).splitKeys );
+
+
+// -------------------------
+// Case: uniform collection
+
+f.drop();
+f.ensureIndex( { x: 1 } );
+
+// Get baseline document size
+filler = "";
+while( filler.length < 500 ) filler += "a";
+f.save( { x: 0, y: filler } );
+docSize = db.runCommand( { datasize: "test.jstests_splitvector" } ).size;
+assert.gt( docSize, 500 );
+
+// Fill collection and get split vector for 1MB maxChunkSize
+numDocs = 20000;
+for( i=1; i<numDocs; i++ ){
+    f.save( { x: i, y: filler } );
+}
+res = db.runCommand( { splitVector: "test.jstests_splitvector" , keyPattern: {x:1} , maxChunkSize: 1 } );
+
+assert.eq( true , res.ok );
+assert.close( numDocs*docSize / (1<<20) , res.splitKeys.length , "num split keys" , -1 );
+assertChunkSizes( res.splitKeys , numDocs, (1<<20) * 0.9 ); // splitVector cuts at 90% of maxChunkSize
-- 
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