Shalin Shekhar Mangar created SOLR-13365:
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Summary: Add autoscaling policy support for balancing cores across
all availability zones
Key: SOLR-13365
URL: https://issues.apache.org/jira/browse/SOLR-13365
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: AutoScaling
Reporter: Shalin Shekhar Mangar
Assignee: Shalin Shekhar Mangar
Fix For: 8.1, master (9.0)
The autoscaling policy supports spreading replicas of a shard across zones (via
sysprops) but that by itself does not guarantee that all availability zones are
actually used and that too in a balanced way.
For example:
{code}
{replica:#EQUAL, shard:#EACH, sysprop.az:#EACH}
{code}
The above policy might end up using only 2 out of 3 availability zones to
spread the replicas (assuming there are enough nodes per zone to not violate
any other policy rules) and not generate any violations. So although we still
have resilience against the loss of one AZ, we do not keep enough capacity as
we could have if we had used all 3 zones equally. In summary, this is a cluster
balancing problem.
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