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https://issues.apache.org/jira/browse/SOLR-9858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15890212#comment-15890212
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Shalin Shekhar Mangar commented on SOLR-9858:
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I reviewed the combined patch and I have a few comments:
# nit-pick typo Mtrics in MetricsCollectorHandler class javadocs
# There should be some protection inside MetricsCollectorHandler in case
receiving node is neither leader nor overseer? And when the
/admin/metrics/collector replies that it is not in the right role, then we
should refresh the overseer/leader url?
# Unrelated changes in SolrClientCache?
# A bunch of tests inside SolrCoreMetricManagerTest.testRegistryName are
commented out in the patch
# A new group for replica has been created. If it is to contain the aggregated
metrics on the leader, should we call it shard instead?
# Can we extract the default 60s used in SolrMetricManager replica and overseer
reporters into a static final constant? Same for SolrOverseerReporter class
# On a related node, we need to add and aggregate disk free stats
# There is no default read or connect timeout specified on http clients created
from SolrClientCache. I think we should use the UpdateShardHandler's http
client instead.
# I couldn't find anything that prevents the leader itself from instantiating
the SolrReplicaReporter to report its own stats to itself?
# I built and ran solr with this patch using bin/solr -e cloud -noprompt which
starts 2 nodes and creates a "gettingstarted" collection with 2 shards and 2
replicas. I can't find the "leader" stats for this collection in the
/admin/metrics output on either nodes. Then I created a new collection using
./bin/solr create -c xyz -shards 1 -replicationFactor 1 -- for this collection
I could find the leader stats under the "overseer" group which is not what I
expected. What am I missing?
> Collect aggregated metrics from nodes and shard leaders in overseer
> -------------------------------------------------------------------
>
> Key: SOLR-9858
> URL: https://issues.apache.org/jira/browse/SOLR-9858
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: metrics
> Affects Versions: master (7.0)
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Minor
> Attachments: SOLR-9858.patch
>
>
> Overseer can collect metrics from Solr nodes and shard leaders in order to
> have a notion of the indexing / query / replication / system load on each
> node, shard and its replicas. This information then can be used for cluster
> (auto)scaling.
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