ajantha-bhat commented on code in PR #6887:
URL: https://github.com/apache/iceberg/pull/6887#discussion_r1422303733


##########
core/src/main/java/org/apache/iceberg/avro/AvroFileAppender.java:
##########
@@ -78,14 +78,13 @@ public Metrics metrics() {
 
   @Override
   public long length() {
-    if (stream != null) {
-      try {
-        return stream.getPos();
-      } catch (IOException e) {
-        throw new RuntimeIOException(e, "Failed to get stream length");
-      }
+    Preconditions.checkNotNull(stream, "Failed to get stream length: no open 
stream");

Review Comment:
   Aah, I used `checkNotNull` before instead of `checkState` before as it was 
just replacing NULL check. 
   
   But yeah. It is better to throw  `IllegalStateException` instead of `NPE`.  
I have updated now.



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