Sumit Mohanty created AMBARI-3147:
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Summary: 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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