parquet-hadoop/src/main/java/org/apache/parquet/hadoop/MemoryManager.java
synchronized void removeWriter(InternalParquetRecordWriter writer) {
    if (writerList.containsKey(writer)) {
      writerList.remove(writer);
    }
    if (!writerList.isEmpty()) {
      updateAllocation();
    }
  }
synchronized void removeWriter(InternalParquetRecordWriter writer) {
    if (writerList.containsKey(writer)) {
      writerList.remove(writer);
    }
    if (!writerList.isEmpty()) {
      updateAllocation();
    }
  }
Remove the given writer from the memory manager.
@param writer the writer that has been closed