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https://issues.apache.org/jira/browse/SOLR-11522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16648052#comment-16648052
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David Smiley commented on SOLR-11522:
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bq. the purpose of MapWriter is not too write and object to a Map
Woops; yes that's right, I said it wrong. We agree it's to efficiently
serialize to a JSON-like structure. BTW I think it helps readers to see the
non-default methods first -- here that's just "writeMap" and should draw the
reader's attention to it first. I am mostly worried about the suitability of
"get" declared on this interface, and I think the costly lookup is symptomatic
of this misalignment. This interface should be limited to writing IMO. If
theoretically MapWriter subclassed something else with a Map-like get method
then that would be fine. I'm not necessarily saying overall that's what we
should do, only that it's better than this.
> Suggestions/recommendations to rebalance replicas
> -------------------------------------------------
>
> Key: SOLR-11522
> URL: https://issues.apache.org/jira/browse/SOLR-11522
> Project: Solr
> Issue Type: Sub-task
> Security Level: Public(Default Security Level. Issues are Public)
> Components: AutoScaling
> Reporter: Noble Paul
> Priority: Major
>
> It is possible that a cluster is unbalanced even if it is not breaking any of
> the policy rules. Some nodes may have very little load while some others may
> be heavily loaded. So, it is possible to move replicas around so that the
> load is more evenly distributed. This is going to be driven by preferences.
> The way we arrive at these suggestions is going to be as follows
> # Sort the nodes according to the given preferences
> # Choose a replica from the most loaded node ({{source-node}})
> # try adding them to the least loaded node ({{target-node}})
> # See if it breaks any policy rules. If yes , try another {{target-node}}
> (go to #3)
> # If no policy rules are being broken, present this as a {{suggestion}} .
> The suggestion contains the following information
> #* The {{source-node}} and {{target-node}} names
> #* The actual v2 command that can be run to effect the operation
> # Go to step #1
> # Do this until the a replicas can be moved in such a way that the {{target
> node}} is more loaded than the {{source-node}}
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