liyafan82 commented on a change in pull request #6323:
URL: https://github.com/apache/arrow/pull/6323#discussion_r412067968



##########
File path: 
java/memory/src/test/java/org/apache/arrow/memory/TestLargeArrowBuf.java
##########
@@ -0,0 +1,68 @@
+/*
+ * 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.arrow.memory;
+
+import static org.junit.Assert.assertEquals;
+
+import io.netty.buffer.ArrowBuf;
+
+/**
+ * Integration test for large (more than 2GB) {@link io.netty.buffer.ArrowBuf}.
+ * To run this test, please
+ *<li>Make sure there are 4GB memory available in the system.</li>
+ * <li>
+ *   Make sure the default allocation manager type is unsafe.

Review comment:
       Nice catch. Thank you. 




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