adelapena commented on a change in pull request #493:

File path: 
@@ -0,0 +1,473 @@
+ * 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
+ *
+ *
+ *
+ * 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.cassandra.service.reads;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.List;
+import java.util.NavigableSet;
+import java.util.SortedMap;
+import java.util.TreeMap;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.apache.cassandra.concurrent.Stage;
+import org.apache.cassandra.db.Clustering;
+import org.apache.cassandra.db.ColumnFamilyStore;
+import org.apache.cassandra.db.Columns;
+import org.apache.cassandra.db.ConsistencyLevel;
+import org.apache.cassandra.db.DecoratedKey;
+import org.apache.cassandra.db.DeletionTime;
+import org.apache.cassandra.db.Keyspace;
+import org.apache.cassandra.db.ReadCommand;
+import org.apache.cassandra.db.RegularAndStaticColumns;
+import org.apache.cassandra.db.SinglePartitionReadCommand;
+import org.apache.cassandra.db.filter.ClusteringIndexFilter;
+import org.apache.cassandra.db.filter.ClusteringIndexNamesFilter;
+import org.apache.cassandra.db.partitions.UnfilteredPartitionIterator;
+import org.apache.cassandra.db.partitions.UnfilteredPartitionIterators;
+import org.apache.cassandra.db.rows.EncodingStats;
+import org.apache.cassandra.db.rows.RangeTombstoneMarker;
+import org.apache.cassandra.db.rows.Row;
+import org.apache.cassandra.db.rows.Rows;
+import org.apache.cassandra.db.rows.Unfiltered;
+import org.apache.cassandra.db.rows.UnfilteredRowIterator;
+import org.apache.cassandra.db.rows.UnfilteredRowIterators;
+import org.apache.cassandra.exceptions.ReadTimeoutException;
+import org.apache.cassandra.exceptions.UnavailableException;
+import org.apache.cassandra.locator.Endpoints;
+import org.apache.cassandra.locator.Replica;
+import org.apache.cassandra.locator.ReplicaPlan;
+import org.apache.cassandra.locator.ReplicaPlans;
+import org.apache.cassandra.metrics.TableMetrics;
+import org.apache.cassandra.schema.TableMetadata;
+import org.apache.cassandra.service.StorageProxy;
+import org.apache.cassandra.tracing.Tracing;
+import org.apache.cassandra.utils.btree.BTreeSet;
+ * Helper in charge of collecting additional queries to be done on the 
coordinator to protect against invalid results
+ * being included due to replica-side filtering (secondary indexes or {@code 
+ * <p>
+ * When using replica-side filtering with CL>ONE, a replica can send a stale 
result satisfying the filter, while updated
+ * replicas won't send a corresponding tombstone to discard that result during 
reconciliation. This helper identifies
+ * the rows in a replica response that don't have a corresponding row in other 
replica responses, and requests them by
+ * primary key to the "silent" replicas in a second fetch round.
+ * <p>
+ * See CASSANDRA-8272 and CASSANDRA-8273 for further details.
+ */
+class ReplicaFilteringProtection<E extends Endpoints<E>>

Review comment:
       @maedhroz So it seems we need to query transient replicas with RFP. 
Anyway I'm extending the dtests to cover transient replication in case we are 
missing something.

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