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https://issues.apache.org/jira/browse/AMBARI-3147?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13794636#comment-13794636
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Sumit Mohanty commented on AMBARI-3147:
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How to modify ganglia config if you are using Ambari 1.2.5?
* Stop Ganglia Service
* Go to the host where ganglia gmetad server is deployed
* Edit the file
/var/lib/ambari-agent/puppet/modules/hdp-ganglia/files/gmetadLib.sh (use the
attached patch as the guide)
** Essentially, the default config is overwritten with the new config
* At this point if you start Ganglia server then any new metrics will create
smaller rrd files (~12/24 KB) but the older metrics would still retain the
larger file (.6/1.2 MB)
* You can also delete (after backing up) the files in /var/lib/ganglia/rrds/
(or where ever the rrd files are located - see config type "global", with tag
that is associated with the cluster, and property name "rrdcached_base_dir")
and then have ganglia recreate all rrd files after it starts
* Once you decide which way to go based on the disk space requirements, make
the necessary changes and start Ganglia service
> Modify ganglia config to match the data resolution of the older version
> -----------------------------------------------------------------------
>
> Key: AMBARI-3147
> URL: https://issues.apache.org/jira/browse/AMBARI-3147
> Project: Ambari
> Issue Type: Bug
> Components: controller
> Affects Versions: 1.4.0
> Reporter: Sumit Mohanty
> Assignee: Sumit Mohanty
> Fix For: 1.4.1
>
> Attachments: AMBARI-3147.patch
>
>
> New ganglia version retains almost 50 times more data for higher resolution
> metrics collection. Ambari needs to modify the configuration to match the
> older resolution as the new default config has a very high disk space
> requirement.
> Looks like the default config for ganglia changed from
> RRAs "RRA:AVERAGE:0.5:1:244" "RRA:AVERAGE:0.5:24:244"
> "RRA:AVERAGE:0.5:168:244" "RRA:AVERAGE:0.5:672:244" "RRA:AVERAGE:0.5:5760:374"
> to
> RRAs "RRA:AVERAGE:0.5:1:5856" "RRA:AVERAGE:0.5:4:20160"
> "RRA:AVERAGE:0.5:40:52704"
> Its an increase from 1350 data points to 78720. After reverting to older
> configuration the file size for a single metrics and its summary info are
> {noformat}
> -rw-rw-rw- 1 nobody nobody 12224 Sep 7 18:29
> ./HDPNameNode/c6402.ambari.apache.org/disk_free.rrd
> -rw-rw-rw- 1 nobody nobody 23656 Sep 7 18:29
> ./HDPNameNode/__SummaryInfo__/disk_free.rrd
> {noformat}
> In contrast it was
> {noformat}
> -rw-r--r-- 1 root root 630768 Sep 7 17:48
> /tmp/rrds/HDPNameNode/c6402.ambari.apache.org/disk_free.rrd
> -rw-r--r-- 1 root root 1261000 Sep 7 17:47
> /tmp/rrds/HDPNameNode/__SummaryInfo__/disk_free.rrd
> {noformat}
> The recommendation is to revert back to the old config (i.e. do not use the
> new default config). Confirming that with an older installation of Ambari.
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