cpoerschke commented on a change in pull request #1571:
URL: https://github.com/apache/lucene-solr/pull/1571#discussion_r518725166



##########
File path: 
solr/contrib/ltr/src/java/org/apache/solr/ltr/interleaving/TeamDraftInterleaving.java
##########
@@ -0,0 +1,87 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.solr.ltr.interleaving;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.LinkedHashSet;
+import java.util.Random;
+import java.util.Set;
+
+import org.apache.lucene.search.ScoreDoc;
+
+public class TeamDraftInterleaving implements Interleaving{
+  public static Random RANDOM;
+
+  static {
+    // We try to make things reproducible in the context of our tests by 
initializing the random instance
+    // based on the current seed
+    String seed = System.getProperty("tests.seed");

Review comment:
       
https://github.com/cpoerschke/lucene-solr/commit/63a190b57fdc892b98c546f005edbc096e4e4095
 is part 2 of 2: it removes the tests.seed System property use in 
TeamDraftInterleaving by passing a Random object into TeamDraftInterleaving. 
instead the tests.seed System property use is in a test class 
(LTRQParserTestPlugin) and tests continue to make their `setRANDOM` calls but 
instead of `TeamDraftInterleaving.setRANDOM` it's now 
`LTRQParserTestPlugin.setRANDOM` then.
   
   Two problems with this though:
   * a forbidden apis check fails (saying that RandomizedRunner's random() 
should be used instead but i'm unclear still on how that might be done)
   * the tests no longer pass, which baffles me though haven't looked at 
details yet; speculations:
     * was the randomness in the tests predictable before and now it's 
predictable also but the number sequence has changed and test expectations need 
to be adjusted to match?
     * something to do with order of system property setting and non-test/test 
class loading perhaps and perhaps use of the RandomizedRunner's random would 
solve it somehow?
   




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