Noble Paul created SOLR-12495:
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Summary: Make it possible to evenly distribute replicas
Key: SOLR-12495
URL: https://issues.apache.org/jira/browse/SOLR-12495
Project: Solr
Issue Type: Sub-task
Security Level: Public (Default Security Level. Issues are Public)
Components: AutoScaling
Reporter: Noble Paul
Support a new function value for {{replica= "#MINIMUM"}}
minimum means the minimum computed value for the given configuration
the value of replica will be calculated as {{<=
Math.ceil(number_of_replicas/number_of_valid_nodes) }}
*example 1:*
{code:java}
{"replica" : "#MINIMUM" , "shard" : "#EACH" , "node" : "#ANY"}
{code}
*case 1* : nodes=3, replicationFactor=4
the value of replica will be calculated as {{Math.ceil(4/3) = 2}}
current state : nodes=3, replicationFactor=2
this is equivalent to the hard coded rule
{code:java}
{"replica" : "<3" , "shard" : "#EACH" , "node" : "#ANY"}
{code}
*case 2* :
current state : nodes=3, replicationFactor=2
this is equivalent to the hard coded rule
{code:java}
{"replica" : "<3" , "shard" : "#EACH" , "node" : "#ANY"}
{code}
*example:2*
{code:json}
{"replica" : "#MINIMUM" , "node" : "#ANY"}{code}
case 1: numShards = 2, replicationFactor=3, nodes = 5
this is equivalent to the hard coded rule
{code:java}
{"replica" : "<3" , "node" : "#ANY"}
{code}
*example:3*
{code:json}
{"replica" : "<2" , "shard" : "#EACH" , "port" : "8983"}{code}
case 1: {{replicationFactor=3, nodes with port 8983 = 2}}
this is equivalent to the hard coded rule
{code:json}
{"replica" : "<3" , "shard" : "#EACH" , "port" : "8983"}{code}
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