Shalin Shekhar Mangar created SOLR-11989:
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Summary: Make it possible to place a replica of a collection on
all nodes satisfying a given property
Key: SOLR-11989
URL: https://issues.apache.org/jira/browse/SOLR-11989
Project: Solr
Issue Type: Sub-task
Security Level: Public (Default Security Level. Issues are Public)
Components: AutoScaling, SolrCloud
Reporter: Shalin Shekhar Mangar
Fix For: master (8.0), 7.3
Today replicas are placed according to policy rules but there is no way to
drive the number of replicas based on policy e.g.
Example 1: Put a replica of each shard of collection A on each node in the
cluster
{code}
{"replica":">0", "node", "#ANY", "shard" : "#EACH", "collection" : "A"}
{code}
Example 2: Put a replica of each shard of collection A on every nodes with
sysprop.region=east
{code}
{"replica":">0", "sysprop.region", "east", "shard" : "#EACH", "collection" :
"A"}
{code}
The above two rules can be used to compute the replication factor of collection
A but today the replicationFactor parameter passed in collection/shard creation
neither takes the rule into account nor does it prevent conflicts. In fact, the
replicationFactor should be omitted while creating collection A if the above
rules are present.
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