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Posted to pr@cassandra.apache.org by "jonmeredith (via GitHub)" <gi...@apache.org> on 2023/03/04 21:28:51 UTC
[GitHub] [cassandra] jonmeredith commented on a diff in pull request #2186: Improve memtable allocator accounting when updating AtomicBTreePartition
jonmeredith commented on code in PR #2186:
URL: https://github.com/apache/cassandra/pull/2186#discussion_r1125016331
##########
test/unit/org/apache/cassandra/db/partitions/AtomicBTreePartitionMemtableAccountingTest.java:
##########
@@ -0,0 +1,398 @@
+/*
+ * 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.db.partitions;
+
+import java.nio.ByteBuffer;
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.TimeUnit;
+
+import org.junit.BeforeClass;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+import org.apache.cassandra.config.Config;
+import org.apache.cassandra.config.DatabaseDescriptor;
+
+import org.apache.cassandra.cql3.ColumnIdentifier;
+import org.apache.cassandra.db.Clustering;
+import org.apache.cassandra.db.DecoratedKey;
+import org.apache.cassandra.db.DeletionTime;
+
+import org.apache.cassandra.db.Memtable;
+import org.apache.cassandra.db.filter.ColumnFilter;
+import org.apache.cassandra.db.marshal.Int32Type;
+import org.apache.cassandra.db.marshal.SetType;
+import org.apache.cassandra.db.rows.BTreeRow;
+import org.apache.cassandra.db.rows.BufferCell;
+import org.apache.cassandra.db.rows.Cell;
+import org.apache.cassandra.db.rows.CellPath;
+import org.apache.cassandra.db.rows.Cells;
+import org.apache.cassandra.db.rows.ColumnData;
+import org.apache.cassandra.db.rows.ComplexColumnData;
+import org.apache.cassandra.db.rows.NativeCell;
+import org.apache.cassandra.db.rows.Row;
+import org.apache.cassandra.db.rows.UnfilteredRowIterator;
+import org.apache.cassandra.index.transactions.UpdateTransaction;
+import org.apache.cassandra.schema.ColumnMetadata;
+import org.apache.cassandra.schema.TableMetadata;
+import org.apache.cassandra.schema.TableMetadataRef;
+import org.apache.cassandra.utils.ByteBufferUtil;
+import org.apache.cassandra.utils.FBUtilities;
+import org.apache.cassandra.utils.Pair;
+import org.apache.cassandra.utils.btree.BTree;
+import org.apache.cassandra.utils.concurrent.OpOrder;
+import org.apache.cassandra.utils.memory.Cloner;
+import org.apache.cassandra.utils.memory.MemtableAllocator;
+import org.apache.cassandra.utils.memory.MemtableCleaner;
+import org.apache.cassandra.utils.memory.MemtablePool;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/* Test memory pool accounting when updating atomic btree partitions. CASSANDRA-18125 hit an issue
+ * where cells were doubly-counted when releasing causing negative allocator onHeap ownership which
+ * crashed memtable flushing.
+ *
+ * The aim of the test is to exhaustively test updates to simple and complex cells in all possible
+ * state and check the accounting is reasonable. It generates an initial row, then an update row
+ * and checks the allocator ownership is reasonable, then compares usage to a freshly recreated
+ * instance of the partition.
+ *
+ * Replacing existing values does not free up memory and is accounted for when comparing
+ * the fresh build.
+ */
+@RunWith(Parameterized.class)
+public class AtomicBTreePartitionMemtableAccountingTest
+{
+ public static final int INITIAL_TS = 2000;
+ public static final int EARLIER_TS = 1000;
+ public static final int LATER_TS = 3000;
+
+ public static final int NOW_LDT = FBUtilities.nowInSeconds();
+ public static final int LATER_LDT = NOW_LDT + 1000;
+ public static final int EARLIER_LDT = NOW_LDT - 1000;
+
+ public static final int EXPIRED_TTL = 1;
+ public static final int EXPIRING_TTL = 10000;
+
+ public static final long HEAP_LIMIT = 1 << 20;
+ public static final long OFF_HEAP_LIMIT = 1 << 20;
+ public static final float MEMTABLE_CLEANUP_THRESHOLD = 0.25f;
+ public static final MemtableCleaner DUMMY_CLEANER = () -> CompletableFuture.completedFuture(null);
+
+ @Parameterized.Parameters(name="allocationType={0}")
+ public static Iterable<? extends Object> data()
+ {
+ return Arrays.asList(Config.MemtableAllocationType.values());
+ }
+
+ @BeforeClass
+ public static void setUp()
+ {
+ DatabaseDescriptor.daemonInitialization();
+ }
+
+ @Parameterized.Parameter
+ public Config.MemtableAllocationType allocationType;
+
+ @Ignore
+ @Test
+ public void repro() // For running in the IDE, update with failing testCase parameters to run
+ {
+ testCase(INITIAL_TS, Cell.NO_TTL, Cell.NO_DELETION_TIME, new DeletionTime(EARLIER_TS, EARLIER_LDT), 1,
+ EARLIER_TS, Cell.NO_TTL, Cell.NO_DELETION_TIME, DeletionTime.LIVE, 3);
+ }
+
+ @Test
+ public void exhaustiveTest()
+ {
+ // TTLs for initial and updated cells
+ List<Integer> ttls = Arrays.asList(Cell.NO_TTL, EXPIRING_TTL, EXPIRED_TTL);
+
+ // Initital local deleted times - a live cell, and a tombstone from now
+ List<Integer> initialLDTs = Arrays.asList(Cell.NO_DELETION_TIME, NOW_LDT);
+
+ // Initial complex deletion time for c2 - no deletion, earlier than c2 elements, or concurrent with c2 elements
+ List<DeletionTime> initialComplexDeletionTimes = Arrays.asList(DeletionTime.LIVE,
+ new DeletionTime(EARLIER_TS, EARLIER_LDT),
+ new DeletionTime(INITIAL_TS, NOW_LDT));
+
+ // Update timestamps - earlier - ignore update, same as initial, after initial - supercedes
+ List<Integer> updateTimestamps = Arrays.asList(EARLIER_TS, INITIAL_TS, LATER_TS);
+
+ // Update local deleted times - live cell, earlier tombstone, concurrent tombstone, or future deletion
+ List<Integer> updateLDTs = Arrays.asList(Cell.NO_DELETION_TIME, EARLIER_LDT, NOW_LDT, LATER_LDT);
+
+ // Update complex deletion time for c2 - no deletion, earlier than c2 elements,
+ // or concurrent with c2 elements, after c2 elements
+ List<DeletionTime> updateComplexDeletionTimes = Arrays.asList(DeletionTime.LIVE,
+ new DeletionTime(EARLIER_TS, EARLIER_LDT),
+ new DeletionTime(INITIAL_TS, NOW_LDT),
+ new DeletionTime(LATER_TS, LATER_LDT));
+
+ // Number of cells to put in the update collection - overlapping by one cell
+ List<Integer> initialComplexCellCount = Arrays.asList(3, 1);
+ List<Integer> updateComplexCellCount = Arrays.asList(3, 1);
+
+ ttls.forEach(initialTTL -> {
+ initialLDTs.forEach(initialLDT -> {
+ initialComplexDeletionTimes.forEach(initialCDT -> {
+ initialComplexCellCount.forEach(numC2InitialCells -> {
+ updateTimestamps.forEach(updateTS -> {
+ ttls.forEach(updateTTL -> {
+ updateLDTs.forEach(updateLDT -> {
+ updateComplexDeletionTimes.forEach(updateCDT -> {
+ updateComplexCellCount.forEach(numC2UpdateCells -> {
+ testCase(INITIAL_TS, initialTTL, initialLDT, initialCDT, numC2InitialCells,
+ updateTS, updateTTL, updateLDT, updateCDT, numC2UpdateCells);
+ });
+ });
+ });
+ });
+ });
+ });
+ });
+ });
+ });
+ }
+
+ static Cell<?> makeCell(ColumnMetadata column, long timestamp, int ttl, int localDeletionTime, ByteBuffer value, CellPath path)
+ {
+ if (localDeletionTime != Cell.NO_DELETION_TIME) // never a ttl for a tombstone
+ {
+ ttl = Cell.NO_TTL;
+ value = ByteBufferUtil.EMPTY_BYTE_BUFFER;
+ }
+ return new BufferCell(column, timestamp, ttl, localDeletionTime, value, path);
+ }
+
+ void testCase(int initialTS, int initialTTL, int initialLDT, DeletionTime initialCDT, int numC2InitialCells,
+ int updateTS, int updateTTL, int updateLDT, DeletionTime updateCDT, Integer numC2UpdateCells)
+ {
+ // cell type doesn't really matter, just use easy ints.
+ final int pk = 0;
+ TableMetadata metadata =
+ TableMetadata.builder("dummy_ks", "dummy_tbl")
+ .addPartitionKeyColumn("pk", Int32Type.instance)
+ .addRegularColumn("r1", Int32Type.instance)
+ .addRegularColumn("c2", SetType.getInstance(Int32Type.instance, true))
+ .addStaticColumn("s3", Int32Type.instance)
+ .addStaticColumn("c4", SetType.getInstance(Int32Type.instance, true))
+ .build();
+ DecoratedKey partitionKey = DatabaseDescriptor.getPartitioner().decorateKey(ByteBufferUtil.bytes(pk));
+
+ ColumnMetadata r1md = metadata.getColumn(new ColumnIdentifier("r1", false));
+ ColumnMetadata c2md = metadata.getColumn(new ColumnIdentifier("c2", false));
+ ColumnMetadata s3md = metadata.getColumn(new ColumnIdentifier("s3", false));
+ ColumnMetadata c4md = metadata.getColumn(new ColumnIdentifier("c4", false));
+
+ // Test regular row updates
+ Pair<Row, Row> regularRows = makeInitialAndUpdate(r1md, c2md, initialTS, initialTTL, initialLDT, initialCDT, numC2InitialCells,
+ updateTS, updateTTL, updateLDT, updateCDT, numC2UpdateCells);
+ PartitionUpdate initial = PartitionUpdate.singleRowUpdate(metadata, partitionKey, regularRows.left, null);
+ PartitionUpdate update = PartitionUpdate.singleRowUpdate(metadata, partitionKey, regularRows.right, null);
+ validateUpdates(metadata, partitionKey, Arrays.asList(initial, update));
+
+ Pair<Row, Row> staticRows = makeInitialAndUpdate(s3md, c4md, initialTS, initialTTL, initialLDT, initialCDT, numC2InitialCells,
+ updateTS, updateTTL, updateLDT, updateCDT, numC2UpdateCells);
+ // Test static row updates
+ PartitionUpdate staticInitial = PartitionUpdate.singleRowUpdate(metadata, partitionKey, null, staticRows.left);
+ PartitionUpdate staticUpdate = PartitionUpdate.singleRowUpdate(metadata, partitionKey, null, staticRows.right);
+ validateUpdates(metadata, partitionKey, Arrays.asList(staticInitial, staticUpdate));
+ }
+
+ private static Pair<Row, Row> makeInitialAndUpdate(ColumnMetadata regular, ColumnMetadata complex,
+ int initialTS, int initialTTL, int initialLDT,
+ DeletionTime initialComplexDeletionTime, int numC2InitialCells,
+ int updateTS, int updateTTL, int updateLDT,
+ DeletionTime updateComplexDeletionTime, Integer numC2UpdateCells)
+ {
+ final ByteBuffer initialValueBB = ByteBufferUtil.bytes(111);
+ final ByteBuffer updateValueBB = ByteBufferUtil.bytes(222);
+
+ // Create the initial row to populate the partition with
+ Row.Builder initialRowBuilder = BTreeRow.unsortedBuilder();
+ initialRowBuilder.newRow(regular.isStatic() ? Clustering.STATIC_CLUSTERING : Clustering.EMPTY);
+
+ initialRowBuilder.addCell(makeCell(regular, initialTS, initialTTL, initialLDT, initialValueBB, null));
+ if (initialComplexDeletionTime != DeletionTime.LIVE)
+ initialRowBuilder.addComplexDeletion(complex, initialComplexDeletionTime);
+ int cellPath = 1000;
+ for (int i = 0; i < numC2InitialCells; i++)
+ initialRowBuilder.addCell(makeCell(complex, initialTS, initialTTL, initialLDT,
+ ByteBufferUtil.EMPTY_BYTE_BUFFER,
+ CellPath.create(ByteBufferUtil.bytes(cellPath--))));
+ Row initialRow = initialRowBuilder.build();
+
+ // Create the update row to modify the partition with
+ Row.Builder updateRowBuilder = BTreeRow.unsortedBuilder();
+ updateRowBuilder.newRow(regular.isStatic() ? Clustering.STATIC_CLUSTERING : Clustering.EMPTY);
+
+ updateRowBuilder.addCell(makeCell(regular, updateTS, updateTTL, updateLDT, updateValueBB, null));
+ if (updateComplexDeletionTime != DeletionTime.LIVE)
+ updateRowBuilder.addComplexDeletion(complex, updateComplexDeletionTime);
+
+ // Make multiple update cells to make any issues more pronounced
+ cellPath = 1000;
+ for (int i = 0; i < numC2UpdateCells; i++)
+ updateRowBuilder.addCell(makeCell(complex, updateTS, updateTTL, updateLDT,
+ ByteBufferUtil.EMPTY_BYTE_BUFFER,
+ CellPath.create(ByteBufferUtil.bytes(cellPath++))));
Review Comment:
@blerer https://github.com/apache/cassandra/commit/79f46d2e4035f05678aa98f2ab909117d613ff70#r102899481
> nits: It seems that the 2 blocks are the same if I am not mistaken. They could be refactored as a method
The difference is the direction the cellPaths go to make some distinct and some overlapping elements. It could be factored out but felt like a lot more passing settings around.
##########
build.xml:
##########
@@ -570,7 +570,7 @@
<exclusion groupId="org.slf4j" artifactId="slf4j-api"/>
<exclusion groupId="org.codehaus.jackson" artifactId="jackson-mapper-asl"/>
</dependency>
- <dependency groupId="net.java.dev.jna" artifactId="jna" version="5.6.0"/>
+ <dependency groupId="net.java.dev.jna" artifactId="jna" version="5.13.0"/>
Review Comment:
will drop this from the patch - accidentally committed
##########
src/java/org/apache/cassandra/db/rows/NativeCell.java:
##########
@@ -171,4 +171,16 @@ public long unsharedHeapSizeExcludingData()
return EMPTY_SIZE;
}
+ public long offHeapSize()
+ {
+ long size = simpleSize(MemoryUtil.getInt(peer + LENGTH));
Review Comment:
@blerer https://github.com/apache/cassandra/commit/79f46d2e4035f05678aa98f2ab909117d613ff70#r102910076
> This `simpleSize` name is really confusing. I think we should inline the method. It would be much clearer.
Also used in the constructor so want to keep it DRY. Could rename to `offHeapSizeWithoutCellPath`?
##########
test/unit/org/apache/cassandra/db/partitions/AtomicBTreePartitionMemtableAccountingTest.java:
##########
@@ -0,0 +1,398 @@
+/*
+ * 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.db.partitions;
+
+import java.nio.ByteBuffer;
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.TimeUnit;
+
+import org.junit.BeforeClass;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+import org.apache.cassandra.config.Config;
+import org.apache.cassandra.config.DatabaseDescriptor;
+
+import org.apache.cassandra.cql3.ColumnIdentifier;
+import org.apache.cassandra.db.Clustering;
+import org.apache.cassandra.db.DecoratedKey;
+import org.apache.cassandra.db.DeletionTime;
+
+import org.apache.cassandra.db.Memtable;
+import org.apache.cassandra.db.filter.ColumnFilter;
+import org.apache.cassandra.db.marshal.Int32Type;
+import org.apache.cassandra.db.marshal.SetType;
+import org.apache.cassandra.db.rows.BTreeRow;
+import org.apache.cassandra.db.rows.BufferCell;
+import org.apache.cassandra.db.rows.Cell;
+import org.apache.cassandra.db.rows.CellPath;
+import org.apache.cassandra.db.rows.Cells;
+import org.apache.cassandra.db.rows.ColumnData;
+import org.apache.cassandra.db.rows.ComplexColumnData;
+import org.apache.cassandra.db.rows.NativeCell;
+import org.apache.cassandra.db.rows.Row;
+import org.apache.cassandra.db.rows.UnfilteredRowIterator;
+import org.apache.cassandra.index.transactions.UpdateTransaction;
+import org.apache.cassandra.schema.ColumnMetadata;
+import org.apache.cassandra.schema.TableMetadata;
+import org.apache.cassandra.schema.TableMetadataRef;
+import org.apache.cassandra.utils.ByteBufferUtil;
+import org.apache.cassandra.utils.FBUtilities;
+import org.apache.cassandra.utils.Pair;
+import org.apache.cassandra.utils.btree.BTree;
+import org.apache.cassandra.utils.concurrent.OpOrder;
+import org.apache.cassandra.utils.memory.Cloner;
+import org.apache.cassandra.utils.memory.MemtableAllocator;
+import org.apache.cassandra.utils.memory.MemtableCleaner;
+import org.apache.cassandra.utils.memory.MemtablePool;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/* Test memory pool accounting when updating atomic btree partitions. CASSANDRA-18125 hit an issue
+ * where cells were doubly-counted when releasing causing negative allocator onHeap ownership which
+ * crashed memtable flushing.
+ *
+ * The aim of the test is to exhaustively test updates to simple and complex cells in all possible
+ * state and check the accounting is reasonable. It generates an initial row, then an update row
+ * and checks the allocator ownership is reasonable, then compares usage to a freshly recreated
+ * instance of the partition.
+ *
+ * Replacing existing values does not free up memory and is accounted for when comparing
+ * the fresh build.
+ */
+@RunWith(Parameterized.class)
+public class AtomicBTreePartitionMemtableAccountingTest
+{
+ public static final int INITIAL_TS = 2000;
+ public static final int EARLIER_TS = 1000;
+ public static final int LATER_TS = 3000;
+
+ public static final int NOW_LDT = FBUtilities.nowInSeconds();
+ public static final int LATER_LDT = NOW_LDT + 1000;
+ public static final int EARLIER_LDT = NOW_LDT - 1000;
+
+ public static final int EXPIRED_TTL = 1;
+ public static final int EXPIRING_TTL = 10000;
+
+ public static final long HEAP_LIMIT = 1 << 20;
+ public static final long OFF_HEAP_LIMIT = 1 << 20;
+ public static final float MEMTABLE_CLEANUP_THRESHOLD = 0.25f;
+ public static final MemtableCleaner DUMMY_CLEANER = () -> CompletableFuture.completedFuture(null);
+
+ @Parameterized.Parameters(name="allocationType={0}")
+ public static Iterable<? extends Object> data()
+ {
+ return Arrays.asList(Config.MemtableAllocationType.values());
+ }
+
+ @BeforeClass
+ public static void setUp()
+ {
+ DatabaseDescriptor.daemonInitialization();
+ }
+
+ @Parameterized.Parameter
+ public Config.MemtableAllocationType allocationType;
+
+ @Ignore
+ @Test
+ public void repro() // For running in the IDE, update with failing testCase parameters to run
+ {
+ testCase(INITIAL_TS, Cell.NO_TTL, Cell.NO_DELETION_TIME, new DeletionTime(EARLIER_TS, EARLIER_LDT), 1,
+ EARLIER_TS, Cell.NO_TTL, Cell.NO_DELETION_TIME, DeletionTime.LIVE, 3);
+ }
+
+ @Test
+ public void exhaustiveTest()
+ {
+ // TTLs for initial and updated cells
+ List<Integer> ttls = Arrays.asList(Cell.NO_TTL, EXPIRING_TTL, EXPIRED_TTL);
+
+ // Initital local deleted times - a live cell, and a tombstone from now
+ List<Integer> initialLDTs = Arrays.asList(Cell.NO_DELETION_TIME, NOW_LDT);
+
+ // Initial complex deletion time for c2 - no deletion, earlier than c2 elements, or concurrent with c2 elements
+ List<DeletionTime> initialComplexDeletionTimes = Arrays.asList(DeletionTime.LIVE,
+ new DeletionTime(EARLIER_TS, EARLIER_LDT),
+ new DeletionTime(INITIAL_TS, NOW_LDT));
+
+ // Update timestamps - earlier - ignore update, same as initial, after initial - supercedes
+ List<Integer> updateTimestamps = Arrays.asList(EARLIER_TS, INITIAL_TS, LATER_TS);
+
+ // Update local deleted times - live cell, earlier tombstone, concurrent tombstone, or future deletion
+ List<Integer> updateLDTs = Arrays.asList(Cell.NO_DELETION_TIME, EARLIER_LDT, NOW_LDT, LATER_LDT);
+
+ // Update complex deletion time for c2 - no deletion, earlier than c2 elements,
+ // or concurrent with c2 elements, after c2 elements
+ List<DeletionTime> updateComplexDeletionTimes = Arrays.asList(DeletionTime.LIVE,
+ new DeletionTime(EARLIER_TS, EARLIER_LDT),
+ new DeletionTime(INITIAL_TS, NOW_LDT),
+ new DeletionTime(LATER_TS, LATER_LDT));
+
+ // Number of cells to put in the update collection - overlapping by one cell
+ List<Integer> initialComplexCellCount = Arrays.asList(3, 1);
+ List<Integer> updateComplexCellCount = Arrays.asList(3, 1);
+
+ ttls.forEach(initialTTL -> {
+ initialLDTs.forEach(initialLDT -> {
+ initialComplexDeletionTimes.forEach(initialCDT -> {
+ initialComplexCellCount.forEach(numC2InitialCells -> {
+ updateTimestamps.forEach(updateTS -> {
+ ttls.forEach(updateTTL -> {
+ updateLDTs.forEach(updateLDT -> {
+ updateComplexDeletionTimes.forEach(updateCDT -> {
+ updateComplexCellCount.forEach(numC2UpdateCells -> {
+ testCase(INITIAL_TS, initialTTL, initialLDT, initialCDT, numC2InitialCells,
+ updateTS, updateTTL, updateLDT, updateCDT, numC2UpdateCells);
+ });
+ });
+ });
+ });
+ });
+ });
+ });
+ });
+ });
+ }
+
+ static Cell<?> makeCell(ColumnMetadata column, long timestamp, int ttl, int localDeletionTime, ByteBuffer value, CellPath path)
+ {
+ if (localDeletionTime != Cell.NO_DELETION_TIME) // never a ttl for a tombstone
+ {
+ ttl = Cell.NO_TTL;
+ value = ByteBufferUtil.EMPTY_BYTE_BUFFER;
+ }
+ return new BufferCell(column, timestamp, ttl, localDeletionTime, value, path);
+ }
+
+ void testCase(int initialTS, int initialTTL, int initialLDT, DeletionTime initialCDT, int numC2InitialCells,
Review Comment:
@blerer https://github.com/apache/cassandra/commit/79f46d2e4035f05678aa98f2ab909117d613ff70#r102899871
> nit: Would it not be more readable to have some object to bundle all those information together.
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