[jira] [Created] (SPARK-13071) Coalescing HadoopRDD overwrites existing input metrics

["Andrew Or (JIRA)" <ji...@apache.org>]

Andrew Or created SPARK-13071:
---------------------------------

             Summary: Coalescing HadoopRDD overwrites existing input metrics
                 Key: SPARK-13071
                 URL: https://issues.apache.org/jira/browse/SPARK-13071
             Project: Spark
          Issue Type: Bug
          Components: Spark Core
    Affects Versions: 2.0.0
            Reporter: Andrew Or
            Assignee: Andrew Or


Currently if we do the following in Hadoop 2.5+:
{code}
sc.textFile(..., 4).coalesce(2).collect()
{code}

We'll get incorrect `InputMetrics#bytesRead`. This is because HadoopRDD's compute method overwrites any existing value of `bytesRead`, and in the case of coalesce we'll end up calling `compute` multiple times in the same task.

This is why InputOutputMetricsSuite is failing in master, but only for hadoop2.6/2.7: https://amplab.cs.berkeley.edu/jenkins/job/spark-master-test-sbt-hadoop-2.7/67/



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