[jira] [Created] (HADOOP-13284) Remove the rack-aware read stats in FileSystemStorageStatistics from branch-2

["Mingliang Liu (JIRA)" <ji...@apache.org>]

Mingliang Liu created HADOOP-13284:
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             Summary: Remove the rack-aware read stats in FileSystemStorageStatistics from branch-2
                 Key: HADOOP-13284
                 URL: https://issues.apache.org/jira/browse/HADOOP-13284
             Project: Hadoop Common
          Issue Type: Sub-task
    Affects Versions: 2.8.0
            Reporter: Mingliang Liu
            Assignee: Mingliang Liu


As [HDFS-9579] was not committed to {{branch-2.8}}, {{FileSystemStorageStatistics#KEYS}} should not include those rack aware read stats brought by [HDFS-9579], including {{bytesReadLocalHost, bytesReadDistanceOfOneOrTwo, bytesReadDistanceOfThreeOrFour, bytesReadDistanceOfFiveOrLarger}}. Or else, the long iterator will throw NPE when traversing. See detailed exception stack as following (it happens when Tez uses the new FileSystemStorageStatistics).

{code}
2016-06-15 15:56:59,242 [DEBUG] [TezChild] |impl.TezProcessorContextImpl|: Cleared TezProcessorContextImpl related information
2016-06-15 15:56:59,243 [WARN] [main] |task.TezTaskRunner2|: Exception from RunnerCallable
java.lang.NullPointerException
        at org.apache.hadoop.fs.FileSystemStorageStatistics$LongStatisticIterator.next(FileSystemStorageStatistics.java:74)
        at org.apache.hadoop.fs.FileSystemStorageStatistics$LongStatisticIterator.next(FileSystemStorageStatistics.java:51)
        at org.apache.tez.runtime.metrics.FileSystemStatisticsUpdater2.updateCounters(FileSystemStatisticsUpdater2.java:51)
        at org.apache.tez.runtime.metrics.TaskCounterUpdater.updateCounters(TaskCounterUpdater.java:118)
        at org.apache.tez.runtime.RuntimeTask.setFrameworkCounters(RuntimeTask.java:172)
        at org.apache.tez.runtime.task.TaskRunner2Callable.callInternal(TaskRunner2Callable.java:100)
        at org.apache.tez.runtime.task.TaskRunner2Callable.callInternal(TaskRunner2Callable.java:37)
        at org.apache.tez.common.CallableWithNdc.call(CallableWithNdc.java:36)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)
2016-06-15 15:56:59,245 [DEBUG] [main] |task.TaskReporter|: Sending heartbeat to AM, request={  containerId=container_1466028486194_0005_01_000002, requestId=10, startIndex=0, preRoutedStartIndex=1, maxEventsToGet=500, taskAttemptId=attempt_1466028486194_0005_1_00_000000_0, eventCount=4 }
{code}

Thanks [~hitesh] for reporting this.



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