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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-11285) Support simulations at scale in the autoscaling framework
Date Sat, 14 Oct 2017 18:58:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-11285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16204782#comment-16204782
] 

ASF subversion and git services commented on SOLR-11285:
--------------------------------------------------------

Commit 8dd489edcee009e40f44f98c79e69434bd6333ea in lucene-solr's branch refs/heads/master
from [~ab]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=8dd489e ]

SOLR-11285: Support simulations at scale in the autoscaling framework,
part 1 (refactoring).


> Support simulations at scale in the autoscaling framework
> ---------------------------------------------------------
>
>                 Key: SOLR-11285
>                 URL: https://issues.apache.org/jira/browse/SOLR-11285
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: AutoScaling
>            Reporter: Andrzej Bialecki 
>            Assignee: Andrzej Bialecki 
>         Attachments: SOLR-11285.patch
>
>
> This is a spike to investigate how difficult it would be to modify the autoscaling framework
so that it's possible to run simulated large-scale experiments and test its dynamic behavior
without actually spinning up a large cluster.
> Currently many components rely heavily on actual Solr, ZK and behavior of ZK watches,
or insist on making actual HTTP calls. Notable exception is the core Policy framework where
most of the ZK / Solr details are abstracted.
> As the algorithms for autoscaling that we implement become more and more complex the
ability to effectively run multiple large simulations will be crucial - it's very easy to
unknowingly introduce catastrophic instabilities that don't manifest themselves in regular
unit tests.



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