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From "Erick Erickson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-6513) Add a collectionsAPI call ASSIGNPREFERREDLEADERS
Date Fri, 12 Sep 2014 18:56:33 GMT
Erick Erickson created SOLR-6513:
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             Summary: Add a collectionsAPI call ASSIGNPREFERREDLEADERS
                 Key: SOLR-6513
                 URL: https://issues.apache.org/jira/browse/SOLR-6513
             Project: Solr
          Issue Type: Improvement
            Reporter: Erick Erickson
            Assignee: Erick Erickson


Another sub-task for SOLR-6491. The ability to assign a preferred leader on a node-by-node
basis is nice, but tedious to get right for a sysadmin, especially if there are, say, 100s
of nodes hosting a system. This JIRA would essentially provide an automatic mechanism for
assigning these roles (or properties). This particular command would NOT re-elect leaders,
just change the flag in the clusterstate.

My idea for this version is fairly limited. You'd have to specify a collection and there would
be no attempt to, say, evenly distribute the preferred leader role/property for this collection
by looking at _other_ collections. Or by looking at underlying hardware capabilities. Or....

It would be a pretty simple round-robin assignment. About the only intelligence built in would
be to change as few roles/properties as possible. Let's say that the correct number of nodes
for this role turned out to be 3. Any node currently having 3 preferred leaders for this collection
would NOT be changed. Any node having 2 preferred leaders would have one added that would
be taken from some node with > 3 preferred leaders.

This probably needs an optional parameter, something like "includeInactiveNodes=true|false"



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