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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