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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10959) Adding per disk IO statistics in DataNode.
Date Mon, 19 Dec 2016 23:40:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15762653#comment-15762653

Arpit Agarwal commented on HDFS-10959:

A few minor comments that can be addressed in a follow up Jira or at commit time.
# We should add timeouts to the new unit tests.
# Comment line with @Metric annotation can be removed, it looks like a disabled metric. Thanks
for the offline explanation about this.
//@Metric("metadata related operation latency quantiles")
# Just a suggestion to shorten the metrics descriptions:_data related file io flush rate_
can just be _file io flush rate_ etc. I am fine either way though.

> Adding per disk IO statistics in DataNode.
> ------------------------------------------
>                 Key: HDFS-10959
>                 URL: https://issues.apache.org/jira/browse/HDFS-10959
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Xiaoyu Yao
>            Assignee: Xiaoyu Yao
>         Attachments: HDFS-10959.00.patch, HDFS-10959.01.patch, HDFS-10959.02.patch, HDFS-10959.03.patch
> This ticket is opened to support per disk IO statistics in DataNode based on HDFS-10930.
The statistics added will make it easier to implement HDFS-4169 "Add per-disk latency metrics
to DataNode".

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