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https://issues.apache.org/jira/browse/SOLR-10397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16083891#comment-16083891
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Shalin Shekhar Mangar commented on SOLR-10397:
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Linking SOLR-11011 as blocker.
> Port 'autoAddReplicas' feature to the policy rules framework and make it work
> with non-shared filesystems
> ---------------------------------------------------------------------------------------------------------
>
> Key: SOLR-10397
> URL: https://issues.apache.org/jira/browse/SOLR-10397
> Project: Solr
> Issue Type: Sub-task
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Reporter: Shalin Shekhar Mangar
> Assignee: Cao Manh Dat
> Labels: autoscaling
> Fix For: 7.0
>
> Attachments: SOLR-10397.1.patch, SOLR-10397.patch
>
>
> Currently 'autoAddReplicas=true' can be specified in the Collection Create
> API to automatically add replicas when a replica becomes unavailable. I
> propose to move this feature to the autoscaling cluster policy rules design.
> This will include the following:
> * Trigger support for ‘nodeLost’ event type
> * Modification of existing implementation of ‘autoAddReplicas’ to
> automatically create the appropriate ‘nodeLost’ trigger.
> * Any such auto-created trigger must be marked internally such that setting
> ‘autoAddReplicas=false’ via the Modify Collection API should delete or
> disable corresponding trigger.
> * Support for non-HDFS filesystems while retaining the optimization afforded
> by HDFS i.e. the replaced replica can point to the existing data dir of the
> old replica.
> * Deprecate/remove the feature of enabling/disabling ‘autoAddReplicas’ across
> the entire cluster using cluster properties in favor of using the
> suspend-trigger/resume-trigger APIs.
> This will retain backward compatibility for the most part and keep a common
> use-case easy to enable as well as make it available to more people (i.e.
> people who don't use HDFS).
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