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https://issues.apache.org/jira/browse/HADOOP-15507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16497253#comment-16497253
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Xiao Chen edited comment on HADOOP-15507 at 6/5/18 4:14 AM:
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Updating patch 1 to demonstrate the idea and solicit feedback
was (Author: xiaochen):
Updating patch 1 to demonstrate the idea and solicit early feedback
> 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
> Priority: Major
> Fix For: 3.2.0
>
> Attachments: HADOOP-15507.01.patch, image-2018-05-31-15-29-45-729.png
>
>
> 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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