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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-11522) Suggestions/recommendations to rebalance replicas
Date Tue, 25 Sep 2018 14:49:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-11522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16627461#comment-16627461
] 

ASF subversion and git services commented on SOLR-11522:
--------------------------------------------------------

Commit a514392ccfa39c54d745be1dce1a1febdc92bae6 in lucene-solr's branch refs/heads/branch_7x
from [~noble.paul]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=a514392 ]

SOLR-11522: /autoscaling/suggestions now include rebalance options as well even if there are
no violations


> 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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