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https://issues.apache.org/jira/browse/SOLR-11522?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Noble Paul updated SOLR-11522:
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Description:
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}}
was:Suggestions should recommend moving replicas from more loaded nodes to
less loaded nodes to balance the cluster
> 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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