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Posted to issues@solr.apache.org by "Cassandra Targett (Jira)" <ji...@apache.org> on 2021/08/14 01:45:00 UTC
[jira] [Commented] (SOLR-12757) Don't load cores that belong to
inactive shards
[ https://issues.apache.org/jira/browse/SOLR-12757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17399058#comment-17399058 ]
Cassandra Targett commented on SOLR-12757:
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I think this can be changed since it relates to autoscaling, but I'm not sure if there's some aspect of this that is valid without the autoscaling framework?
> Don't load cores that belong to inactive shards
> -----------------------------------------------
>
> Key: SOLR-12757
> URL: https://issues.apache.org/jira/browse/SOLR-12757
> Project: Solr
> Issue Type: Improvement
> Components: AutoScaling
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Major
>
> After shard splitting completes and the new sub-shards become active the original (parent) shards is switched to inactive state. Since 7.4 Solr runs a scheduled trigger that uses {{InactiveShardPlanAction}} to eventually remove inactive shards when their TTL expires (2 days by default).
> However, in the meantime even though the shard is inactive all cores that belong to this shard are still running, and should a node restart these cores would be loaded again too.
> Large scale simulated tests show that in case of a constantly growing index after a while most of the cluster resources are consumed by cores that belong to inactive shards.
> We should change this so that when the switch-over to the new sub-shards is complete the cores belonging to the inactive parent shard should be unloaded and not loaded again - at the very least it should be made into an option that is true by default.
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