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From "Aaron Fabbri (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-15507) Add MapReduce counters about EC bytes read
Date Mon, 04 Jun 2018 21:58:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-15507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16500916#comment-16500916
] 

Aaron Fabbri commented on HADOOP-15507:
---------------------------------------

+1 assuming you manually tested (i.e. your screenshot is real) in addition to running the
updated unit test in the patch. Patch looks fine to me.

> 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
>         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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