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Posted to common-dev@hadoop.apache.org by "Xiao Chen (JIRA)" <ji...@apache.org> on 2018/05/31 22:06:00 UTC

[jira] [Created] (HADOOP-15507) Add MapReduce counters about EC bytes read

Xiao Chen created HADOOP-15507:
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             Summary: Add MapReduce counters about EC bytes read
                 Key: HADOOP-15507
                 URL: https://issues.apache.org/jira/browse/HADOOP-15507
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: Xiao Chen
            Assignee: Xiao Chen


HDFS has added Erasure Coding support in HDFS-7285. There are HDFS level [ReadStatistics|https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/ReadStatistics.java] so from DFSClient we can know how much reads are EC/replication.

In order for users to have a better view of how much of their workload is impacted by EC, we can expose EC read bytes to File System Counters, and to MapReduce's job counters. This way, end users can tell from MR jobs directly.



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