Fuqing Yang created SPARK-6105:
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Summary: enhance spark-ganglia to support redundant gmond
addresses setting in ganglia unicast mode
Key: SPARK-6105
URL: https://issues.apache.org/jira/browse/SPARK-6105
Project: Spark
Issue Type: Improvement
Affects Versions: 1.3.0
Reporter: Fuqing Yang
Priority: Minor
1 why do it?
when using spark-ganglia with ganglia unicast mode, I found it has single point
of failure in gmond setting.
we can not set *.sink.ganglia.host to localhost but only to a designated gmond
address because gmond do not forward the metrics from spark GangliaSink. This
problem can found in ganglia maillist:
[Ganglia-general] Gmond forward messages
http://sourceforge.net/p/ganglia/mailman/message/30268666/
[Ganglia-general] gmond forwarding
http://sourceforge.net/p/ganglia/mailman/message/28290307/
So, in ganglia unicast mode, we may missing the metrics if the designated gmond
went wrong.
2 how to resolve this SPOF
add new parameter *.sink.ganglia.servers in conf/metrics.properties.
eg:
*.sink.ganglia.servers=host1:port1, host2:port2
if enabled spark ganglia sink, use GangliaSink to parse *.sink.ganglia.servers
to construct redundant GangliaReporters.
for backend compatibility, preserve the old parameters *.sink.ganglia.host,
*.sink.ganglia.port, If users do not use *.sink.ganglia.servers, give a
warning, and the old parameters work.
3 problems introduced.
none
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