[
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}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
