ringles commented on a change in pull request #7403:
URL: https://github.com/apache/geode/pull/7403#discussion_r832335002



##########
File path: 
geode-for-redis/src/main/java/org/apache/geode/redis/internal/data/RedisSet.java
##########
@@ -359,8 +359,10 @@ public int scard() {
   }
 
   @Override
-  public void applyAddByteArrayDelta(byte[] bytes) {
-    membersAdd(bytes);
+  public void applyAddByteArrayDelta(List<byte[]> byteArrays) {

Review comment:
       Mooted after rebase

##########
File path: 
geode-for-redis/src/main/java/org/apache/geode/redis/internal/data/RedisList.java
##########
@@ -127,50 +127,139 @@ private int getArrayIndex(int listIndex) {
   }
 
   /**
-   * @param elementsToAdd elements to add to this set; NOTE this list may by 
modified by this call
-   * @param region the region this instance is stored in
-   * @param key the name of the set to add to
-   * @param onlyIfExists if true then the elements should only be added if the 
key already exists
-   *        and holds a list, otherwise no operation is performed.
-   * @return the length of the list after the operation
-   */
-  public long lpush(List<byte[]> elementsToAdd, Region<RedisKey, RedisData> 
region, RedisKey key,
-      final boolean onlyIfExists) {
-    elementsPush(elementsToAdd);
-    storeChanges(region, key, new AddByteArrays(elementsToAdd));
+   * @return the number of elements in the list
+   **/
+  public int llen() {
     return elementList.size();
   }
 
   /**
    * @param region the region this instance is stored in
-   * @param key the name of the set to add to
+   * @param key the name of the list to add to
    * @return the element actually popped
    */
   public byte[] lpop(Region<RedisKey, RedisData> region, RedisKey key) {
-    byte[] popped = elementRemove(0);
-    RemoveElementsByIndex removed = new RemoveElementsByIndex();
-    removed.add(0);
+    byte newVersion;
+    byte[] popped;
+    RemoveElementsByIndex removed;
+    synchronized (this) {
+      newVersion = incrementAndGetVersion();
+      popped = removeFirstElement();
+      removed = new RemoveElementsByIndex(newVersion);
+      removed.add(0);
+    }
     storeChanges(region, key, removed);
     return popped;
   }
 
+  public synchronized byte[] removeFirstElement() {
+    return elementList.removeFirst();
+  }
+
+  public synchronized byte[] removeLastElement() {
+    return elementList.removeLast();
+  }
+
   /**
-   * @return the number of elements in the list
+   * @param elementsToAdd elements to add to this list; NOTE this list may be 
modified by this call
+   * @param region the region this instance is stored in
+   * @param key the name of the list to add to
+   * @param onlyIfExists if true then the elements should only be added if the 
key already exists
+   *        and holds a list, otherwise no operation is performed.
+   * @return the length of the list after the operation
    */
-  public int llen() {
+  public long lpush(List<byte[]> elementsToAdd, Region<RedisKey, RedisData> 
region, RedisKey key,
+      final boolean onlyIfExists) {
+    byte newVersion;
+    AddByteArrays addByteArrays;
+    synchronized (this) {
+      newVersion = incrementAndGetVersion();
+      elementsPush(elementsToAdd);
+      addByteArrays = new AddByteArrays(newVersion, elementsToAdd);
+    }
+    storeChanges(region, key, addByteArrays);
     return elementList.size();
   }
 
+  /**
+   * @param elementsToAdd elements to add to this list; NOTE this list may be 
modified by this call
+   * @param region the region this instance is stored in
+   * @param key the name of the list to add to
+   * @return the number of elements actually added
+   */
+  public long lpush(List<byte[]> elementsToAdd, Region<RedisKey, RedisData> 
region, RedisKey key) {
+    byte newVersion;
+    AddByteArrays addByteArrays;
+    synchronized (this) {
+      newVersion = incrementAndGetVersion();
+      elementsPush(elementsToAdd);
+      addByteArrays = new AddByteArrays(newVersion, elementsToAdd);
+    }
+    storeChanges(region, key, addByteArrays);
+    return elementList.size();
+  }
+
+  public byte[] ltrim(long start, long end, Region<RedisKey, RedisData> region,

Review comment:
       Fixed

##########
File path: 
geode-for-redis/src/main/java/org/apache/geode/redis/internal/commands/executor/list/LTrimExecutor.java
##########
@@ -0,0 +1,57 @@
+/*
+ * 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.geode.redis.internal.commands.executor.list;
+
+import static org.apache.geode.redis.internal.RedisConstants.ERROR_NOT_INTEGER;
+
+import java.util.List;
+
+import org.apache.geode.cache.Region;
+import org.apache.geode.redis.internal.commands.Command;
+import org.apache.geode.redis.internal.commands.executor.CommandExecutor;
+import org.apache.geode.redis.internal.commands.executor.RedisResponse;
+import org.apache.geode.redis.internal.data.RedisData;
+import org.apache.geode.redis.internal.data.RedisKey;
+import org.apache.geode.redis.internal.netty.Coder;
+import org.apache.geode.redis.internal.netty.ExecutionHandlerContext;
+
+public class LTrimExecutor implements CommandExecutor {
+  private static final int startIndex = 2;
+  private static final int stopIndex = 3;
+
+  @Override
+  public RedisResponse executeCommand(Command command, ExecutionHandlerContext 
context) {
+    List<byte[]> commandElems = command.getProcessedCommand();
+    Region<RedisKey, RedisData> region = context.getRegion();
+    RedisKey key = command.getKey();
+
+    long start;
+    long end;
+
+    try {
+      byte[] startI = commandElems.get(startIndex);
+      byte[] stopI = commandElems.get(stopIndex);
+      start = Coder.bytesToLong(startI);
+      end = Coder.bytesToLong(stopI);
+    } catch (NumberFormatException e) {
+      return RedisResponse.error(ERROR_NOT_INTEGER);
+    }
+
+    byte[] retVal =
+        context.listLockedExecute(key, false, list -> list.ltrim(start, end, 
region, key));
+    // return RedisResponse.error(ERROR_NOT_INTEGER);

Review comment:
       Yanked

##########
File path: 
geode-for-redis/src/main/java/org/apache/geode/redis/internal/commands/executor/list/LTrimExecutor.java
##########
@@ -0,0 +1,57 @@
+/*
+ * 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.geode.redis.internal.commands.executor.list;
+
+import static org.apache.geode.redis.internal.RedisConstants.ERROR_NOT_INTEGER;
+
+import java.util.List;
+
+import org.apache.geode.cache.Region;
+import org.apache.geode.redis.internal.commands.Command;
+import org.apache.geode.redis.internal.commands.executor.CommandExecutor;
+import org.apache.geode.redis.internal.commands.executor.RedisResponse;
+import org.apache.geode.redis.internal.data.RedisData;
+import org.apache.geode.redis.internal.data.RedisKey;
+import org.apache.geode.redis.internal.netty.Coder;
+import org.apache.geode.redis.internal.netty.ExecutionHandlerContext;
+
+public class LTrimExecutor implements CommandExecutor {
+  private static final int startIndex = 2;
+  private static final int stopIndex = 3;
+
+  @Override
+  public RedisResponse executeCommand(Command command, ExecutionHandlerContext 
context) {
+    List<byte[]> commandElems = command.getProcessedCommand();
+    Region<RedisKey, RedisData> region = context.getRegion();
+    RedisKey key = command.getKey();
+
+    long start;
+    long end;
+
+    try {
+      byte[] startI = commandElems.get(startIndex);
+      byte[] stopI = commandElems.get(stopIndex);
+      start = Coder.bytesToLong(startI);
+      end = Coder.bytesToLong(stopI);

Review comment:
       Streamlined by inlining

##########
File path: 
geode-for-redis/src/integrationTest/java/org/apache/geode/redis/internal/commands/executor/list/AbstractLTrimIntegrationTest.java
##########
@@ -0,0 +1,228 @@
+/*
+ * 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.geode.redis.internal.commands.executor.list;
+
+import static 
org.apache.geode.redis.RedisCommandArgumentsTestHelper.assertExactNumberOfArgs;
+import static org.apache.geode.redis.internal.RedisConstants.ERROR_NOT_INTEGER;
+import static org.apache.geode.redis.internal.RedisConstants.ERROR_WRONG_TYPE;
+import static 
org.apache.geode.test.dunit.rules.RedisClusterStartupRule.BIND_ADDRESS;
+import static 
org.apache.geode.test.dunit.rules.RedisClusterStartupRule.REDIS_CLIENT_TIMEOUT;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+import java.util.concurrent.atomic.AtomicReference;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import redis.clients.jedis.HostAndPort;
+import redis.clients.jedis.JedisCluster;
+import redis.clients.jedis.Protocol;
+
+import org.apache.geode.redis.ConcurrentLoopingThreads;
+import org.apache.geode.redis.RedisIntegrationTest;
+
+public abstract class AbstractLTrimIntegrationTest implements 
RedisIntegrationTest {
+  public static final String KEY = "key";
+  public static final String PREEXISTING_VALUE = "preexistingValue";
+  private JedisCluster jedis;
+
+  @Before
+  public void setUp() {
+    jedis = new JedisCluster(new HostAndPort(BIND_ADDRESS, getPort()), 
REDIS_CLIENT_TIMEOUT);
+  }
+
+  @After
+  public void tearDown() {
+    flushAll();
+    jedis.close();
+  }
+
+  @Test
+  public void givenWrongNumOfArgs_returnsError() {
+    assertExactNumberOfArgs(jedis, Protocol.Command.LTRIM, 3);
+  }
+
+  @Test
+  public void withNonListKey_Fails() {
+    jedis.set("string", PREEXISTING_VALUE);
+    assertThatThrownBy(() -> jedis.ltrim("string", 0, -1))
+        .hasMessage(ERROR_WRONG_TYPE);
+  }
+
+  @Test
+  public void withNonExistentKey_returnsNull() {
+    assertThat(jedis.ltrim("nonexistent", 0, -1)).isEqualTo("OK");
+  }
+
+  @Test
+  public void withNonIntegerRangeSpecifier_Fails() {
+    jedis.lpush(KEY, "e1", "e2", "e3", "e4");
+
+    assertThatThrownBy(() -> jedis.sendCommand(KEY, Protocol.Command.LTRIM, 
KEY,
+        "0", "not-an-integer"))
+            .hasMessage(ERROR_NOT_INTEGER);
+    assertThatThrownBy(() -> jedis.sendCommand(KEY, Protocol.Command.LTRIM, 
KEY,
+        "not-an-integer", "-1"))
+            .hasMessage(ERROR_NOT_INTEGER);
+    assertThatThrownBy(() -> jedis.sendCommand(KEY, Protocol.Command.LTRIM, 
KEY,
+        "not-an-integer", "not-an-integer"))
+            .hasMessage(ERROR_NOT_INTEGER);
+  }
+
+  @Test
+  public void trimsToSpecifiedRange_givenValidRange() {
+    initializeTestList();
+
+    jedis.ltrim(KEY, 0, 0);
+    assertThat(jedis.llen(KEY)).isEqualTo(1);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e4");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 0, 1);
+    assertThat(jedis.llen(KEY)).isEqualTo(2);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e4");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e3");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 0, 2);
+    assertThat(jedis.llen(KEY)).isEqualTo(3);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e4");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 2)).isEqualTo("e2");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 1, 2);
+    assertThat(jedis.llen(KEY)).isEqualTo(2);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e2");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 1, -1);
+    assertThat(jedis.llen(KEY)).isEqualTo(3);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e2");
+    assertThat(jedis.lindex(KEY, 2)).isEqualTo("e1");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 1, -2);
+    assertThat(jedis.llen(KEY)).isEqualTo(2);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e2");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, -2, -1);
+    assertThat(jedis.llen(KEY)).isEqualTo(2);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e2");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e1");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, -1, -1);
+    assertThat(jedis.llen(KEY)).isEqualTo(1);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e1");
+  }
+
+  @Test
+  public void trimsToCorrectRange_givenSpecifiersOutsideListSize() {
+    initializeTestList();
+
+    jedis.ltrim(KEY, -4, -1);
+    assertThat(jedis.llen(KEY)).isEqualTo(4);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e4");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 2)).isEqualTo("e2");
+    assertThat(jedis.lindex(KEY, 3)).isEqualTo("e1");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, -10, 10);
+    assertThat(jedis.llen(KEY)).isEqualTo(4);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e4");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 2)).isEqualTo("e2");
+    assertThat(jedis.lindex(KEY, 3)).isEqualTo("e1");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 0, 4);
+    assertThat(jedis.llen(KEY)).isEqualTo(4);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e4");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 2)).isEqualTo("e2");
+    assertThat(jedis.lindex(KEY, 3)).isEqualTo("e1");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 0, 10);
+    assertThat(jedis.llen(KEY)).isEqualTo(4);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e4");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 2)).isEqualTo("e2");
+    assertThat(jedis.lindex(KEY, 3)).isEqualTo("e1");
+  }
+
+  private void initializeTestList() {
+    jedis.del(KEY);
+    jedis.lpush(KEY, "e1", "e2", "e3", "e4");
+  }
+
+  @Test
+  public void removesKey_whenLastElementRemoved() {
+    final String keyWithTagForKeysCommand = "{tag}" + KEY;
+    jedis.lpush(keyWithTagForKeysCommand, "e1", "e2", "e3");
+
+    jedis.ltrim(keyWithTagForKeysCommand, 0, -4);
+    assertThat(jedis.llen(keyWithTagForKeysCommand)).isEqualTo(0L);
+    assertThat(jedis.keys(keyWithTagForKeysCommand)).isEmpty();
+  }
+
+  @Test
+  public void removesKey_whenLastElementRemoved_multipleTimes() {
+    final String keyWithTagForKeysCommand = "{tag}" + KEY;
+    jedis.lpush(keyWithTagForKeysCommand, "e1", "e2", "e3");
+
+    jedis.ltrim(keyWithTagForKeysCommand, 0, -4);
+    jedis.ltrim(keyWithTagForKeysCommand, 0, -4);
+
+    assertThat(jedis.keys(keyWithTagForKeysCommand)).isEmpty();
+  }
+
+  @Test
+  public void withConcurrentLPush_returnsCorrectValue() {
+    String[] valuesInitial = new String[] {"un", "deux", "troix"};

Review comment:
       Mais oui!

##########
File path: 
geode-for-redis/src/integrationTest/java/org/apache/geode/redis/internal/commands/executor/list/AbstractLTrimIntegrationTest.java
##########
@@ -0,0 +1,228 @@
+/*
+ * 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.geode.redis.internal.commands.executor.list;
+
+import static 
org.apache.geode.redis.RedisCommandArgumentsTestHelper.assertExactNumberOfArgs;
+import static org.apache.geode.redis.internal.RedisConstants.ERROR_NOT_INTEGER;
+import static org.apache.geode.redis.internal.RedisConstants.ERROR_WRONG_TYPE;
+import static 
org.apache.geode.test.dunit.rules.RedisClusterStartupRule.BIND_ADDRESS;
+import static 
org.apache.geode.test.dunit.rules.RedisClusterStartupRule.REDIS_CLIENT_TIMEOUT;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+import java.util.concurrent.atomic.AtomicReference;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import redis.clients.jedis.HostAndPort;
+import redis.clients.jedis.JedisCluster;
+import redis.clients.jedis.Protocol;
+
+import org.apache.geode.redis.ConcurrentLoopingThreads;
+import org.apache.geode.redis.RedisIntegrationTest;
+
+public abstract class AbstractLTrimIntegrationTest implements 
RedisIntegrationTest {
+  public static final String KEY = "key";
+  public static final String PREEXISTING_VALUE = "preexistingValue";
+  private JedisCluster jedis;
+
+  @Before
+  public void setUp() {
+    jedis = new JedisCluster(new HostAndPort(BIND_ADDRESS, getPort()), 
REDIS_CLIENT_TIMEOUT);
+  }
+
+  @After
+  public void tearDown() {
+    flushAll();
+    jedis.close();
+  }
+
+  @Test
+  public void givenWrongNumOfArgs_returnsError() {
+    assertExactNumberOfArgs(jedis, Protocol.Command.LTRIM, 3);
+  }
+
+  @Test
+  public void withNonListKey_Fails() {
+    jedis.set("string", PREEXISTING_VALUE);
+    assertThatThrownBy(() -> jedis.ltrim("string", 0, -1))
+        .hasMessage(ERROR_WRONG_TYPE);
+  }
+
+  @Test
+  public void withNonExistentKey_returnsNull() {
+    assertThat(jedis.ltrim("nonexistent", 0, -1)).isEqualTo("OK");
+  }
+
+  @Test
+  public void withNonIntegerRangeSpecifier_Fails() {
+    jedis.lpush(KEY, "e1", "e2", "e3", "e4");
+
+    assertThatThrownBy(() -> jedis.sendCommand(KEY, Protocol.Command.LTRIM, 
KEY,
+        "0", "not-an-integer"))
+            .hasMessage(ERROR_NOT_INTEGER);
+    assertThatThrownBy(() -> jedis.sendCommand(KEY, Protocol.Command.LTRIM, 
KEY,
+        "not-an-integer", "-1"))
+            .hasMessage(ERROR_NOT_INTEGER);
+    assertThatThrownBy(() -> jedis.sendCommand(KEY, Protocol.Command.LTRIM, 
KEY,
+        "not-an-integer", "not-an-integer"))
+            .hasMessage(ERROR_NOT_INTEGER);
+  }
+
+  @Test
+  public void trimsToSpecifiedRange_givenValidRange() {
+    initializeTestList();
+
+    jedis.ltrim(KEY, 0, 0);
+    assertThat(jedis.llen(KEY)).isEqualTo(1);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e4");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 0, 1);
+    assertThat(jedis.llen(KEY)).isEqualTo(2);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e4");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e3");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 0, 2);
+    assertThat(jedis.llen(KEY)).isEqualTo(3);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e4");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 2)).isEqualTo("e2");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 1, 2);
+    assertThat(jedis.llen(KEY)).isEqualTo(2);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e2");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 1, -1);
+    assertThat(jedis.llen(KEY)).isEqualTo(3);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e2");
+    assertThat(jedis.lindex(KEY, 2)).isEqualTo("e1");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 1, -2);
+    assertThat(jedis.llen(KEY)).isEqualTo(2);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e2");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, -2, -1);
+    assertThat(jedis.llen(KEY)).isEqualTo(2);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e2");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e1");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, -1, -1);
+    assertThat(jedis.llen(KEY)).isEqualTo(1);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e1");
+  }
+
+  @Test
+  public void trimsToCorrectRange_givenSpecifiersOutsideListSize() {
+    initializeTestList();
+
+    jedis.ltrim(KEY, -4, -1);
+    assertThat(jedis.llen(KEY)).isEqualTo(4);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e4");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 2)).isEqualTo("e2");
+    assertThat(jedis.lindex(KEY, 3)).isEqualTo("e1");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, -10, 10);
+    assertThat(jedis.llen(KEY)).isEqualTo(4);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e4");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 2)).isEqualTo("e2");
+    assertThat(jedis.lindex(KEY, 3)).isEqualTo("e1");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 0, 4);
+    assertThat(jedis.llen(KEY)).isEqualTo(4);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e4");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 2)).isEqualTo("e2");
+    assertThat(jedis.lindex(KEY, 3)).isEqualTo("e1");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 0, 10);
+    assertThat(jedis.llen(KEY)).isEqualTo(4);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e4");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 2)).isEqualTo("e2");
+    assertThat(jedis.lindex(KEY, 3)).isEqualTo("e1");
+  }
+
+  private void initializeTestList() {
+    jedis.del(KEY);
+    jedis.lpush(KEY, "e1", "e2", "e3", "e4");
+  }
+
+  @Test
+  public void removesKey_whenLastElementRemoved() {
+    final String keyWithTagForKeysCommand = "{tag}" + KEY;
+    jedis.lpush(keyWithTagForKeysCommand, "e1", "e2", "e3");
+
+    jedis.ltrim(keyWithTagForKeysCommand, 0, -4);
+    assertThat(jedis.llen(keyWithTagForKeysCommand)).isEqualTo(0L);
+    assertThat(jedis.keys(keyWithTagForKeysCommand)).isEmpty();

Review comment:
       Done for both

##########
File path: 
geode-for-redis/src/integrationTest/java/org/apache/geode/redis/internal/commands/executor/list/AbstractLTrimIntegrationTest.java
##########
@@ -0,0 +1,228 @@
+/*
+ * 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.geode.redis.internal.commands.executor.list;
+
+import static 
org.apache.geode.redis.RedisCommandArgumentsTestHelper.assertExactNumberOfArgs;
+import static org.apache.geode.redis.internal.RedisConstants.ERROR_NOT_INTEGER;
+import static org.apache.geode.redis.internal.RedisConstants.ERROR_WRONG_TYPE;
+import static 
org.apache.geode.test.dunit.rules.RedisClusterStartupRule.BIND_ADDRESS;
+import static 
org.apache.geode.test.dunit.rules.RedisClusterStartupRule.REDIS_CLIENT_TIMEOUT;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+import java.util.concurrent.atomic.AtomicReference;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import redis.clients.jedis.HostAndPort;
+import redis.clients.jedis.JedisCluster;
+import redis.clients.jedis.Protocol;
+
+import org.apache.geode.redis.ConcurrentLoopingThreads;
+import org.apache.geode.redis.RedisIntegrationTest;
+
+public abstract class AbstractLTrimIntegrationTest implements 
RedisIntegrationTest {
+  public static final String KEY = "key";
+  public static final String PREEXISTING_VALUE = "preexistingValue";
+  private JedisCluster jedis;
+
+  @Before
+  public void setUp() {
+    jedis = new JedisCluster(new HostAndPort(BIND_ADDRESS, getPort()), 
REDIS_CLIENT_TIMEOUT);
+  }
+
+  @After
+  public void tearDown() {
+    flushAll();
+    jedis.close();
+  }
+
+  @Test
+  public void givenWrongNumOfArgs_returnsError() {
+    assertExactNumberOfArgs(jedis, Protocol.Command.LTRIM, 3);
+  }
+
+  @Test
+  public void withNonListKey_Fails() {
+    jedis.set("string", PREEXISTING_VALUE);
+    assertThatThrownBy(() -> jedis.ltrim("string", 0, -1))
+        .hasMessage(ERROR_WRONG_TYPE);
+  }
+
+  @Test
+  public void withNonExistentKey_returnsNull() {
+    assertThat(jedis.ltrim("nonexistent", 0, -1)).isEqualTo("OK");
+  }
+
+  @Test
+  public void withNonIntegerRangeSpecifier_Fails() {
+    jedis.lpush(KEY, "e1", "e2", "e3", "e4");
+
+    assertThatThrownBy(() -> jedis.sendCommand(KEY, Protocol.Command.LTRIM, 
KEY,
+        "0", "not-an-integer"))
+            .hasMessage(ERROR_NOT_INTEGER);
+    assertThatThrownBy(() -> jedis.sendCommand(KEY, Protocol.Command.LTRIM, 
KEY,
+        "not-an-integer", "-1"))
+            .hasMessage(ERROR_NOT_INTEGER);
+    assertThatThrownBy(() -> jedis.sendCommand(KEY, Protocol.Command.LTRIM, 
KEY,
+        "not-an-integer", "not-an-integer"))
+            .hasMessage(ERROR_NOT_INTEGER);
+  }
+
+  @Test
+  public void trimsToSpecifiedRange_givenValidRange() {
+    initializeTestList();
+
+    jedis.ltrim(KEY, 0, 0);
+    assertThat(jedis.llen(KEY)).isEqualTo(1);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e4");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 0, 1);
+    assertThat(jedis.llen(KEY)).isEqualTo(2);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e4");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e3");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 0, 2);
+    assertThat(jedis.llen(KEY)).isEqualTo(3);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e4");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 2)).isEqualTo("e2");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 1, 2);
+    assertThat(jedis.llen(KEY)).isEqualTo(2);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e2");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 1, -1);
+    assertThat(jedis.llen(KEY)).isEqualTo(3);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e2");
+    assertThat(jedis.lindex(KEY, 2)).isEqualTo("e1");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, 1, -2);
+    assertThat(jedis.llen(KEY)).isEqualTo(2);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e2");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, -2, -1);
+    assertThat(jedis.llen(KEY)).isEqualTo(2);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e2");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e1");
+
+    initializeTestList();
+
+    jedis.ltrim(KEY, -1, -1);
+    assertThat(jedis.llen(KEY)).isEqualTo(1);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e1");
+  }
+
+  @Test
+  public void trimsToCorrectRange_givenSpecifiersOutsideListSize() {
+    initializeTestList();
+
+    jedis.ltrim(KEY, -4, -1);
+    assertThat(jedis.llen(KEY)).isEqualTo(4);
+    assertThat(jedis.lindex(KEY, 0)).isEqualTo("e4");
+    assertThat(jedis.lindex(KEY, 1)).isEqualTo("e3");
+    assertThat(jedis.lindex(KEY, 2)).isEqualTo("e2");
+    assertThat(jedis.lindex(KEY, 3)).isEqualTo("e1");
+
+    initializeTestList();

Review comment:
       In this test case, you're right.

##########
File path: 
geode-for-redis/src/main/java/org/apache/geode/redis/internal/data/RedisSet.java
##########
@@ -422,16 +424,21 @@ synchronized boolean membersRemove(byte[] memberToRemove) 
{
    * @return the number of members actually added
    */
   public long sadd(List<byte[]> membersToAdd, Region<RedisKey, RedisData> 
region, RedisKey key) {
-    AddByteArrays delta = new AddByteArrays();
+    AddByteArrays delta;
+    byte newVersion;
     int membersAdded = 0;
-    for (byte[] member : membersToAdd) {
-      if (membersAdd(member)) {
-        delta.add(member);
-        membersAdded++;
+    synchronized (this) {
+      newVersion = incrementAndGetVersion();
+      delta = new AddByteArrays(newVersion);
+      for (byte[] member : membersToAdd) {
+        if (membersAdd(member)) {
+          delta.add(member);
+          membersAdded++;
+        }
+      }
+      if (membersAdded == 0) {

Review comment:
       No longer touching RedisSet after rebase

##########
File path: 
geode-for-redis/src/main/java/org/apache/geode/redis/internal/data/RedisSet.java
##########
@@ -422,16 +424,21 @@ synchronized boolean membersRemove(byte[] memberToRemove) 
{
    * @return the number of members actually added
    */
   public long sadd(List<byte[]> membersToAdd, Region<RedisKey, RedisData> 
region, RedisKey key) {
-    AddByteArrays delta = new AddByteArrays();
+    AddByteArrays delta;
+    byte newVersion;
     int membersAdded = 0;
-    for (byte[] member : membersToAdd) {
-      if (membersAdd(member)) {
-        delta.add(member);
-        membersAdded++;
+    synchronized (this) {
+      newVersion = incrementAndGetVersion();

Review comment:
       Reworked




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