[jira] Created: (HADOOP-4450) The local bytes read of Mapper tasks are too high than bytes written

[Runping Qi (JIRA)]

The local bytes read of Mapper tasks are too high than bytes written
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                 Key: HADOOP-4450
                 URL: https://issues.apache.org/jira/browse/HADOOP-4450
             Project: Hadoop Core
          Issue Type: Bug
          Components: mapred
    Affects Versions: 0.17.2
            Reporter: Runping Qi



The local bytes read are 6 times that of local bytes written.
This is very hard to explain.

Here is the relevant counters:

Counters for tip_200810170704_0044_m_000001

File Systems
        Local bytes read        6,684,486,486
        Local bytes written     1,007,113,506
        HDFS bytes read         147,200,700

Map-Reduce Framework
        Map input records       3,588,883
        Map output records      3,588,883
        Map input bytes         147,200,579
        Map output bytes        464,822,403
        Combine input records   0
        Combine output records  0

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