Andrzej Bialecki created SOLR-12757:
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Summary: 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
Security Level: Public (Default Security Level. Issues are Public)
Components: AutoScaling
Reporter: Andrzej Bialecki
Assignee: Andrzej Bialecki
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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