maedhroz commented on a change in pull request #1382:
URL: https://github.com/apache/cassandra/pull/1382#discussion_r791242745



##########
File path: 
test/distributed/org/apache/cassandra/distributed/fuzz/SSTableGenerator.java
##########
@@ -0,0 +1,381 @@
+/*
+ * 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.cassandra.distributed.fuzz;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.SortedSet;
+
+import harry.core.Run;
+import harry.ddl.SchemaSpec;
+import harry.model.OpSelectors;
+import harry.operations.Relation;
+import harry.operations.Query;
+import harry.operations.QueryGenerator;
+import harry.util.BitSet;
+import org.apache.cassandra.cql3.AbstractMarker;
+import org.apache.cassandra.cql3.ColumnIdentifier;
+import org.apache.cassandra.cql3.Operator;
+import org.apache.cassandra.cql3.QueryOptions;
+import org.apache.cassandra.cql3.SingleColumnRelation;
+import org.apache.cassandra.cql3.VariableSpecifications;
+import org.apache.cassandra.cql3.WhereClause;
+import org.apache.cassandra.cql3.restrictions.StatementRestrictions;
+import org.apache.cassandra.cql3.statements.Bound;
+import org.apache.cassandra.cql3.statements.DeleteStatement;
+import org.apache.cassandra.cql3.statements.StatementType;
+import org.apache.cassandra.db.ClusteringBound;
+import org.apache.cassandra.db.ColumnFamilyStore;
+import org.apache.cassandra.db.ConsistencyLevel;
+import org.apache.cassandra.db.DecoratedKey;
+import org.apache.cassandra.db.DeletionTime;
+import org.apache.cassandra.db.Mutation;
+import org.apache.cassandra.db.RangeTombstone;
+import org.apache.cassandra.db.RowUpdateBuilder;
+import org.apache.cassandra.db.Slices;
+import org.apache.cassandra.db.marshal.ByteBufferAccessor;
+import org.apache.cassandra.db.marshal.CompositeType;
+import org.apache.cassandra.db.partitions.PartitionUpdate;
+import org.apache.cassandra.io.sstable.format.SSTableReader;
+import org.apache.cassandra.schema.ColumnMetadata;
+import org.apache.cassandra.schema.TableMetadata;
+import org.apache.cassandra.utils.ByteBufferUtil;
+import org.apache.cassandra.utils.FBUtilities;
+
+import static harry.generators.DataGenerators.UNSET_VALUE;
+
+public class SSTableGenerator
+{
+    protected final SchemaSpec schema;
+    protected final OpSelectors.DescriptorSelector descriptorSelector;
+    protected final OpSelectors.MonotonicClock clock;
+    protected final ColumnFamilyStore store;
+    protected final TableMetadata metadata;
+    protected final QueryGenerator rangeSelector;
+
+    private final Set<SSTableReader> sstables = new HashSet<>();
+
+    private long lts = 0;
+
+    public SSTableGenerator(Run run,
+                            ColumnFamilyStore store)
+    {
+        this.schema = run.schemaSpec;
+        this.descriptorSelector = run.descriptorSelector;
+        this.clock = run.clock;
+        this.store = store;
+        // We assume metadata can not change over the lifetime of sstable 
generator
+        this.metadata = store.metadata.get();
+        this.rangeSelector = new QueryGenerator(schema, run.pdSelector, 
descriptorSelector, run.rng);
+        store.disableAutoCompaction();
+    }
+
+    public Collection<SSTableReader> gen(int rows)
+    {
+        return gen(rows, 0);
+    }
+
+    public Collection<SSTableReader> gen(int rows, int level)
+    {
+        mark();
+        for (int i = 0; i < rows; i++)
+        {
+            long current = lts++;
+            write(current, current, current, current, true).applyUnsafe();
+            if (schema.staticColumns != null)
+                writeStatic(current, current, current, current, 
true).applyUnsafe();
+        }
+
+        return flush(level);
+    }
+
+    public void mark()
+    {
+        sstables.clear();
+        sstables.addAll(store.getLiveSSTables());
+    }
+
+    public Collection<SSTableReader> flush(int level)
+    {
+        store.forceBlockingFlush();
+        sstables.removeAll(store.getLiveSSTables());
+
+        for (SSTableReader reader : sstables)
+        {
+            if (reader.getSSTableLevel() != reader.getSSTableLevel())

Review comment:
       Related: Is there any case where we aren't flushing to L0? Just a little 
worries that the API we have here might allow flushing to L1+ with overlapping 
ranges...




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