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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7331) Add Datanode network counts to datanode jmx page
Date Fri, 21 Nov 2014 00:23:33 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14220288#comment-14220288
] 

Aaron T. Myers commented on HDFS-7331:
--------------------------------------

For reference, here's some docs on RRDTool, which is what Ganglia uses internally. Of particular
note:

{quote}
Every rrd input parameter is either of type GAUGE, DERIVE, ABSOLUTE, COMPUTE or COUNTER. GAUGE
values store a certain sample at a particular instant. Whereas COUNTER values store the difference
from the previous value. COUNTERs are useful when you want to measure bandwidth utilization
in which the values monotonically increase. Other types are not so commonly used. If you are
curious read the man page of rrdcreate(1).
{quote}

> 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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