kennknowles opened a new issue, #18406:
URL: https://github.com/apache/beam/issues/18406

   AvroReader is able to detect when it's in the last block:
   
https://github.com/apache/beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/io/AvroSource.java#L728
   
   It could also use this information to avoid wastefully producing dynamic 
splits starting in the range of the current block.
   
   One way to do this would be to have OffsetRangeTracker have a "claim range" 
operation: claim range of [a, b) is, in terms of correctness, equivalent to 
claiming "a" (it checks whether "a" is within the range), but sets the last 
claimed position to "b" rather than "a", thus protecting more positions from 
being split away.
   
   Imported from Jira 
[BEAM-2716](https://issues.apache.org/jira/browse/BEAM-2716). Original Jira may 
contain additional context.
   Reported by: jkff.


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