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Posted to common-issues@hadoop.apache.org by "Xiao Chen (JIRA)" <ji...@apache.org> on 2018/06/05 04:15:00 UTC
[jira] [Comment Edited] (HADOOP-15507) Add MapReduce counters about
EC bytes read
[ https://issues.apache.org/jira/browse/HADOOP-15507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16497253#comment-16497253 ]
Xiao Chen edited comment on HADOOP-15507 at 6/5/18 4:14 AM:
------------------------------------------------------------
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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