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From "Arpit Agarwal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10838) Last full block report received time for each DN should be easily discoverable
Date Fri, 03 Mar 2017 01:46:46 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15893555#comment-15893555
] 

Arpit Agarwal commented on HDFS-10838:
--------------------------------------

The patch needs a trivial rebase to resolve a conflict in hdfs.proto. Overall the changes
look great. I tried this out in a test cluster and the new column in the NN web ui is very
helpful! Two comments:
# We should use monotonicNow to calculate the time difference for the web UI. DataNodeInfo
has two fields for heartbeat - lastUpdate and lastUpdateMonotonic. We can use the same approach.
# Also we can add the new field(s) to {{JsonUtil#toJsonMap(DatanodeInfo)}}.

Sorry about the long delay in reviewing this.

> Last full block report received time for each DN should be easily discoverable
> ------------------------------------------------------------------------------
>
>                 Key: HDFS-10838
>                 URL: https://issues.apache.org/jira/browse/HDFS-10838
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: ui
>            Reporter: Arpit Agarwal
>            Assignee: Surendra Singh Lilhore
>         Attachments: DFSAdmin-Report.png, HDFS-10838-001.patch, HDFS-10838.002.patch,
HDFS-10838.003.patch, HDFS-10838.004.patch, HDFS-10838.005.patch, NN_UI.png, NN_UI_relative_time_minutes.png,
NN_UI_relative_time.png
>
>
> It should be easy for administrators to discover the time of last full block report from
each DataNode.
> We can show it in the NameNode web UI or in the output of {{hdfs dfsadmin -report}},
or both.



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