ConeyLiu commented on code in PR #1240:
URL: https://github.com/apache/parquet-mr/pull/1240#discussion_r1423706347


##########
parquet-hadoop/src/main/java/org/apache/parquet/hadoop/MemoryManager.java:
##########
@@ -74,7 +75,7 @@ private void checkRatio(float ratio) {
    * @param writer     the new created writer
    * @param allocation the requested buffer size
    */
-  synchronized void addWriter(InternalParquetRecordWriter<?> writer, Long 
allocation) {
+  void addWriter(InternalParquetRecordWriter<?> writer, Long allocation) {

Review Comment:
   This is not the same. The `synchronized` locks the whole method. While the 
`ConcurrentHashMap` could only guarantee the safety get/put here.



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