siddharthteotia commented on a change in pull request #4418: Fix potential 
resource leak in the way we close a collection of closeables
URL: https://github.com/apache/incubator-pinot/pull/4418#discussion_r303636695
 
 

 ##########
 File path: 
pinot-core/src/main/java/org/apache/pinot/core/io/writer/impl/FixedByteSingleValueMultiColWriter.java
 ##########
 @@ -99,9 +100,12 @@ public void setBytes(int row, int col, byte[] bytes) {
     indexDataBuffer.readFrom(offset, bytes);
   }
 
+  @Override
   public void close()
       throws IOException {
-    this.indexDataBuffer.close();
-    this.indexDataBuffer = null;
+    if (this.indexDataBuffer != null) {
 
 Review comment:
   One thought was that in case this multi-thread scenario does happen then NPE 
might be better than a core dump / segmentation fault (as a result of doing set 
operation on buffer that has been closed/released especially since all set/get 
operations on direct buffer are unsafe).

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