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From "Haohui Mai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7331) Add Datanode network counts to datanode jmx page
Date Tue, 18 Nov 2014 01:44:33 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14215587#comment-14215587
] 

Haohui Mai commented on HDFS-7331:
----------------------------------

Thinking about it a little bit more, from a operational point of view maybe it is important
to limit the TTL of these counts.

If I understand correctly, the current patch does not reset the counts unless the DN is restarted.
The number of the network failures since the last 24 hours, last week, etc. might be more
valuable.

Therefore I think it might be more appropriate to limit the TTL of the counts (which should
be configurable), instead of bounding the maximum size of the map (which should be effectively
bounded by the TTL anyway).

> Add Datanode network counts to datanode jmx page
> ------------------------------------------------
>
>                 Key: HDFS-7331
>                 URL: https://issues.apache.org/jira/browse/HDFS-7331
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: datanode
>            Reporter: Charles Lamb
>            Assignee: Charles Lamb
>            Priority: Minor
>         Attachments: HDFS-7331.001.patch, HDFS-7331.002.patch, HDFS-7331.003.patch, HDFS-7331.004.patch
>
>
> Add per-datanode counts to the datanode jmx page. For example, networkErrors could be
exposed like this:
> {noformat}
>   }, {
> ...
>     "DatanodeNetworkCounts" : "{\"dn1\":{\"networkErrors\":1}}",
> ...
>     "NamenodeAddresses" : "{\"localhost\":\"BP-1103235125-127.0.0.1-1415057084497\"}",
>     "VolumeInfo" : "{\"/tmp/hadoop-cwl/dfs/data/current\":{\"freeSpace\":3092725760,\"usedSpace\":28672,\"reservedSpace\":0}}",
>     "ClusterId" : "CID-4b38f2ae-5e58-4e15-b3cf-3ba3f46e724e"
>   }, {
> {noformat}



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