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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7674) Adding metrics for Erasure Coding
Date Thu, 16 Apr 2015 22:41:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14498899#comment-14498899
] 

Kai Zheng commented on HDFS-7674:
---------------------------------

Thanks for the taking care of me. Yeah, you're right. That's why I broke down many things
and have them taken by many other guys. This one isn't of high priority because I thought
we should have the basic workable setups first then we would have the chance to hook metrics
here and there. OK?

> Adding metrics for Erasure Coding
> ---------------------------------
>
>                 Key: HDFS-7674
>                 URL: https://issues.apache.org/jira/browse/HDFS-7674
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Kai Zheng
>            Assignee: Kai Zheng
>
> As the design (in HDFS-7285) indicates, erasure coding involves non-trivial impact and
workload for NameNode, DataNode and client; it also allows configurable and pluggable erasure
codec and schema with flexible tradeoff options (see HDFS-7337). To support necessary analysis
and adjustment, we'd better have various meaningful metrics for the EC support, like encoding/decoding
tasks, recovered blocks, read/transferred data size, computation time and etc.



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