supermem613 commented on code in PR #5439:
URL: https://github.com/apache/incubator-gluten/pull/5439#discussion_r1591120073


##########
gluten-core/src/main/java/org/apache/gluten/memory/memtarget/spark/DynamicOffHeapSizingPolicyChecker.java:
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@@ -0,0 +1,71 @@
+/*
+ * 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.gluten.memory.memtarget.spark;
+
+import org.apache.gluten.GlutenConfig;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.concurrent.atomic.AtomicLong;
+
+public final class DynamicOffHeapSizingPolicyChecker {
+  private static final Logger LOG =
+      LoggerFactory.getLogger(DynamicOffHeapSizingPolicyChecker.class);
+  private final long maxOnHeapMemoryInBytes = 
GlutenConfig.getConf().onHeapMemorySize();
+  private final AtomicLong usedOffHeapBytes = new AtomicLong();
+
+  DynamicOffHeapSizingPolicyChecker() {}
+
+  public boolean canBorrow(long size) {

Review Comment:
   Agreed. With the proposed change, we are seeing the "max on heap" as being 
the spark.executor.memory setting, but that does go against Spark's setting 
aside memory accordingly. I'll change the proposed logic to follow what Spark 
has determined as the max on-heap.



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