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https://issues.apache.org/jira/browse/SOLR-11714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16316393#comment-16316393
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Andrzej Bialecki commented on SOLR-11714:
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The current behavior of the framework is trappy because user has to modify the
preferences when he adds a {{searchRate}} trigger in order to avoid the loop -
if he forgets to do that he can bring the autoscaling down.
There are two things that we can do here: {{ComputePlanAction}} should be able
to detect infinite (or very long) loops based roughly on the cluster size and
the total number of replicas across the cluster, eg. if we have a cluster of 10
nodes and 20 replicas but the loop generated 1000 operations then something is
definitely wrong.
Also, can we use some default limit, eg. 2 * replication factor, or something
similar, for ADDREPLICA suggester, at least for events produced by
{{searchRate}} trigger? Where do you think this default should be initialized?
> AddReplicaSuggester endless loop
> --------------------------------
>
> Key: SOLR-11714
> URL: https://issues.apache.org/jira/browse/SOLR-11714
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: AutoScaling
> Affects Versions: 7.2, master (8.0)
> Reporter: Andrzej Bialecki
> Assignee: Noble Paul
> Attachments: 7.2-disable-search-rate-trigger.diff, SOLR-11714.diff
>
>
> {{SearchRateTrigger}} events are processed by {{ComputePlanAction}} and
> depending on the condition either a MoveReplicaSuggester or
> AddReplicaSuggester is selected.
> When {{AddReplicaSuggester}} is selected there's currently a bug in master,
> due to an API change (Hint.COLL_SHARD should be used instead of Hint.COLL).
> However, after fixing that bug {{ComputePlanAction}} goes into an endless
> loop because the suggester endlessly keeps creating new operations.
> Please see the patch that fixes the Hint.COLL_SHARD issue and modifies the
> unit test to illustrate this failure.
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