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From: StephanEwen <git@git.apache.org>
To: issues@flink.incubator.apache.org
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References: <git-pr-896-flink@git.apache.org>
In-Reply-To: <git-pr-896-flink@git.apache.org>
Subject: [GitHub] flink pull request: [FLINK-2292][FLINK-1573] add live
 per-task acc...
Content-Type: text/plain
Message-Id: <20150709164424.B4F00E6837@git1-us-west.apache.org>
Date: Thu,  9 Jul 2015 16:44:24 +0000 (UTC)

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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