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https://issues.apache.org/jira/browse/SOLR-15019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17258313#comment-17258313
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ASF subversion and git services commented on SOLR-15019:
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Commit 2695624a9f2d11a63f3640dd7f3bb30c2e6f938e in lucene-solr's branch
refs/heads/master from Andrzej Bialecki
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=2695624 ]
SOLR-15019: Replica placement API needs a way to fetch existing replica metrics.
> Replica placement API needs a way to fetch existing replica metrics
> -------------------------------------------------------------------
>
> Key: SOLR-15019
> URL: https://issues.apache.org/jira/browse/SOLR-15019
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Major
> Time Spent: 9h
> Remaining Estimate: 0h
>
> Replica placement API was introduced in SOLR-14613. It offers a few sample
> (and simple) implementations of placement plugins.
> However, this API doesn't offer support for retrieving per-replica metrics,
> which are required for calculating more realistic placements. For example,
> when calculating placements for ADDREPLICA on an already existing collection
> the plugin should know what is the size of replica in order to avoid placing
> large replicas on nodes with insufficient free disk space.
> After discussing this with [~ilan] we propose the following additions to the
> API:
> * use the existing {{AttributeFetcher}} interface as a facade for retrieving
> per-replica values (currently it only retrieves per-node values)
> * add {{ShardValues}} interface to represent strongly-typed API for key
> metrics, such as replica size, number of docs, number of update and search
> requests.
> Plugins could then use this API like this:
> {code}
> AttributeFetcher attributeFetcher = ...
> SolrCollection solrCollection = ...
> Set<String> metricNames = ...
> attributeFetcher.requestCollectionMetrics(solrCollection,
> solrCollection.getShardNames(), metricNames);
> AttributeValues attributeValues = attributeFetcher.fetchAttributes();
> ShardValues shardValues =
> attributeValues.getShardMetrics(solrCollection.getName(), shardName);
> int sizeInGB = shardValues.getSizeInGB(); // retrieves shard leader metrics
> int replicaSizeInGB = shardValues.getSizeInGB(replica);
> {code}
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