[jira] [Created] (SOLR-13226) Add note in Node Added Trigger documentation in Autoscaling

["Amrit Sarkar (JIRA)" <ji...@apache.org>]

Amrit Sarkar created SOLR-13226:
-----------------------------------

             Summary: Add note in Node Added Trigger documentation in Autoscaling
                 Key: SOLR-13226
                 URL: https://issues.apache.org/jira/browse/SOLR-13226
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
          Components: AutoScaling
            Reporter: Amrit Sarkar
         Attachments: Screen Shot 2019-02-05 at 3.55.31 AM.png

Node Added Trigger doesn't abide by SOFT rules [strict: false] and results in abnormal cluster operational behavior.

Let's say; we wish to do the following:
1. Not more than 10 cores reside on Single node.
2. Wish to distribute the cores, replicas equally to each Node.

If we go by the following policy:

not more than one replica for unique shard on a node. not a strict rule.
{code}
  {"replica":"<2", "shard": "#EACH", "node": "#ANY", "strict": false},
{code}
distribute the replicas equally across the nodes, not a strict rule.
{code}
  {"replica": "#EQUAL", "node": "#ANY", "strict": false},
{code}
not more than 10 cores allowed on a single node, strict rule.
{code}
  {"cores": "<10", "node": "#ANY"}
{code}
cluster state ends up like:

Screenshot -1

Only the strict rule is followed and multiple replicas are added to single Solr node, as rules are not strict – _{"replica":"<2", "shard": "#EACH", "node": "#ANY", "strict": false}_

While the following with all strict rule generate normal operational behavior, add a replica to each shard of collection 'wiki' :
{code}
[
  {"replica":"<2", "shard": "#EACH", "node": "#ANY"},
  {"replica": "#EQUAL", "node": "#ANY"},
  {"cores": "<10", "node": "#ANY"}
  ]
{code}

This behavior should be documented.



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