Ishan Chattopadhyaya created SOLR-15694:
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Summary: Concept of non-data nodes
Key: SOLR-15694
URL: https://issues.apache.org/jira/browse/SOLR-15694
Project: Solr
Issue Type: New Feature
Security Level: Public (Default Security Level. Issues are Public)
Components: AutoScaling
Reporter: Ishan Chattopadhyaya
I think we should have first class support for starting a Solr node in a mode
whereby no cores will be placed on them. These nodes are useful for certain
scenarios:
# Dedicated overseer nodes
# Nodes where only plugins are installed and used (e.g. cluster/node level
plugins)
# Dedicated nodes for querying (more on this to come later).
Today, to achieve this effect, one can:
1. start a node (which will make it join live_nodes and be immediately
available for replica placement).
2. Put replica placement rules or autoscaling policies to prevent replicas from
being placed there. This is not standardized, 8x has two ways to achieve this
(replica placement rules and autoscaling framework), 9x has a new autoscaling
framework.
Proposing a start parameter for starting a node that starts the node in this
configuration, and then internally this is handled appropriately (across 8x and
9x). This should be Kubernetes/Docker friendly as well, since it is easy to add
an additional parameter for a startup (instead of putting things into
autoscaling.json in ZK via init scripts).
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