Noble Paul created SOLR-12592:
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Summary: Support the cores:'EQUAL' in autoscaling policies
Key: SOLR-12592
URL: https://issues.apache.org/jira/browse/SOLR-12592
Project: Solr
Issue Type: New Feature
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Noble Paul
Assignee: Noble Paul
It's possible to sort nodes according to cores and the system can normally
prefer nodes with fewer cores when placing new replicas. However, it may not
give suggestions to move off replicas , if the system is already in an
unbalanced state.
The following rule may help achieve such a balanced distribution of cores
{code}
{"cores":"#EQUAL" , node: "#ANY"}
{code}
The value of cores is computed as {{total_cores/total_nodes}}. for e.g: if
there are 28 cores in total and there are 5 nodes . the value of cores= 28/5 =
5.6. This means a node may have either 5 cores or 6 cores.
It's possible that this may cause a conflict with other collection-specific
rules such as
{code}
{"replica":"#EQUAL" , "node" : "#ANY"}
{code}
It can be remedied by making this rule , not strict.
{code}
{"cores":"#EQUAL" , "node": "#ANY", "strict"=false}
{code}
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