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https://issues.apache.org/jira/browse/SOLR-6513?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Erick Erickson updated SOLR-6513:
---------------------------------
Attachment: SOLR-6513.patch
Here's what I hope is the final patch. I'll commit this in a day or two unless
there are objections.
I ran about 500 iterations last night. NOTE: I can certainly see situations
where the network topology and/or the algorithm produce sub-optimal
distributions. From my testing so far, however, I haven't seen this happen. Of
course the numbers of shards/replicas are pretty small all things considered.
Worst case is probably that in some situations, one manually assigns a
sliceUnique property to certain nodes. The code preserves any manual
assignments assuming that the total of unique properties assigned to a
particular node is < (num slices)/(num nodes) + 1.
Reviewboard here: https://reviews.apache.org/r/26374/
> Add a collectionsAPI call BALANCESLICEUNIQUE
> --------------------------------------------
>
> Key: SOLR-6513
> URL: https://issues.apache.org/jira/browse/SOLR-6513
> Project: Solr
> Issue Type: Improvement
> Reporter: Erick Erickson
> Assignee: Erick Erickson
> Attachments: SOLR-6513.patch, SOLR-6513.patch, SOLR-6513.patch
>
>
> Another sub-task for SOLR-6491. The ability to assign a property 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 a property. This
> particular command simply changes the cluster state, it doesn't do anything
> like re-assign functions.
> 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 properties for this collection would NOT be
> changed. Any node having 2 properties would have one added that would be
> taken from some node with > 3 properties like this.
> This probably needs an optional parameter, something like
> "includeInactiveNodes=true|false"
> Since this is an arbitrary property, one must specify sliceUnique=true. So
> for the "preferredLeader" functionality, one would specify something like:
> action=BALANCESLICEUNIQUE&property=preferredLeader&proprety.value=true.
> There are checks in this code that require the preferredLeader to have a t/f
> value and require that sliceUnique bet true. That said, this can be called on
> an arbitrary property that has only one such property per slice.
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