danny0405 commented on code in PR #7226:
URL: https://github.com/apache/hudi/pull/7226#discussion_r1027509172


##########
hudi-client/hudi-spark-client/src/main/java/org/apache/hudi/table/action/commit/UpsertPartitioner.java:
##########
@@ -367,9 +368,19 @@ public int getPartition(Object key) {
   /**
    * Obtains the average record size based on records written during previous 
commits. Used for estimating how many
    * records pack into one file.
+   * Respect user setting by following the precedence as below
+   * 1) if user sets a value, then use it as is
+   * 2) if user not setting it, infer from timeline commit metadata
+   * 3) if timeline is empty, use a default (current: 1024)
    */
   protected static long averageBytesPerRecord(HoodieTimeline commitTimeline, 
HoodieWriteConfig hoodieWriteConfig) {
+    long defaultAvgSize = 
Integer.parseInt(HoodieCompactionConfig.COPY_ON_WRITE_RECORD_SIZE_ESTIMATE.defaultValue());
     long avgSize = hoodieWriteConfig.getCopyOnWriteRecordSizeEstimate();
+
+    if (avgSize != defaultAvgSize) {

Review Comment:
   The `HoodieCompactionConfig#build` already sets the defaults explicitly if 
it is not configured, so what's the problem here ?



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