lib/logstash/outputs/s3/temporary_file_factory.rb in logstash-output-s3-4.0.5 vs lib/logstash/outputs/s3/temporary_file_factory.rb in logstash-output-s3-4.0.6

@@ -107,11 +107,17 @@
             @gzip_writer.to_io.path
           end
 
           def size
             # to get the current file size
-            @gzip_writer.flush
-            @gzip_writer.to_io.size
+            if @gzip_writer.pos == 0
+              # Ensure a zero file size is returned when nothing has
+              # yet been written to the gzip file.
+              0
+            else
+              @gzip_writer.flush
+              @gzip_writer.to_io.size
+            end
           end
 
           def fsync
             @gzip_writer.to_io.fsync
           end