Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/896#issuecomment-120065197
This pattern seems to repeat in many places:
```java
AccumulatorRegistry accumulatorRegistry =
getEnvironment().getAccumulatorRegistry();
AccumulatorRegistry.Internal internalRegistry =
accumulatorRegistry.getInternal();
this.recordsOutCounter =
internalRegistry.createLongCounter(AccumulatorRegistry.Internal.NUM_RECORDS_OUT);
this.bytesOutCounter =
internalRegistry.createLongCounter(AccumulatorRegistry.Internal.NUM_BYTES_OUT);
AccumulatorRegistry.External externalRegistry =
accumulatorRegistry.getExternal();
this.accumulatorMap = new HashMap<String, Accumulator<?, ?>>();
externalRegistry.setMap(this.accumulatorMap);
```
I think the code would be simpler is the registry simply always had a
created map for internal and external accumulators. Also, a "reporter" object
would help. The code would then look like:
```java
AccumulatorRegistry accumulatos = getEnvironment().getAccumulatorRegistry();
ReadWriteReporter reporter = accumulatos.getReadWriteReporter();
writer.setStatsReporter(reporter);
this.accumulatorMap = accumulatos.getUserMap();
```
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