Stanislav Lukyanov created IGNITE-8726:
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Summary: Highlight that memory metrics are local for a node in the
docs
Key: IGNITE-8726
URL: https://issues.apache.org/jira/browse/IGNITE-8726
Project: Ignite
Issue Type: Improvement
Components: documentation
Reporter: Stanislav Lukyanov
Memory Metrics (DataRegionMetrics and DataStorageMetrics) in Ignite are local
for each node. However, this is not highlighted in the documentation enough.
The code snippets suggest to just call `ignite.dataRegionMetrics()` which seems
to be a bit at odds with the general use case of Ignite servers being started
via ignite.sh.
It would be good to have an easily noticeable warning that the metrics will
only return data for the local node (and that, for example, on client they
would typically always print 0).
Also, would be nice to include a couple of practical approaches other than JMX
to collect metrics. E.g. a snippet of client code getting metrics from all
servers:
{code}
Collection<String> metricsFromNodes = ignite.compute().broadcast(() -> {
Ignite ignite = Ignition.localIgnite();
StringBuilder sb = new StringBuilder();
sb.append("Node: " + ignite.name());
for (DataRegionMetrics metrics : ignite.dataRegionMetrics()) {
// append metrics to the builder
}
return sb.toString();
});
for (String metricsString : metricsFromNodes)
System.out.println(metricsString);
{code}
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