The methods advance() and pushProduction() of org.apache.avro.io.parsing.Parser class are invoked at least once per read/write call on ValidatingDecoder, ResolvingDecoder and ValidatingEncoder. Any optimization in these functions will improve overall performance when using these classes.
Try org.apacge.avro.io.Perf -V to see the effect of this patch on the performance. On my machine it gives about 5 to 8% improvement.
The optimizations are:
- Reorder the code within advance() so that the most frequent paths involve minimal comparisons.
- Repleace Symbol.CONTINUE with null to indicate that next symbol on the stack needs to be looked at.
- Get rid of a parameter to pushProduction. This parameter was used only in one call site of that function; others pass null. Refactored the code so that these invocations do not pay for that piece of logic that they don't use.