[jira] [Commented] (SOLR-11670) Implement a periodic house-keeping task

["Erick Erickson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-11670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16265542#comment-16265542 ] 

Erick Erickson commented on SOLR-11670:
---------------------------------------

Here's a way to generate dead nodes in 6x:

Set up a single solr instance, starting it like this:
bin/solr start -z localhost:2181 -p 8981 -s example/cloud/node1/solr

Create a collection (one shard and one replica will do).

Stop that instance and start another changing  the port but keeping the same SOLR_HOME:

bin/solr start -z localhost:2181 -p 8982 -s example/cloud/node1/solr

(note, the port has changed, but the -s points to where the old core.properties file is located).

legacyCloud=true needs to be true for this case.

7x doesn't exhibit the behavior at all. I think the issue is that coreNodeName gets defined in core.properties and is used to update an existing znode if things like the base_url or node_name change.





> Implement a periodic house-keeping task
> ---------------------------------------
>
>                 Key: SOLR-11670
>                 URL: https://issues.apache.org/jira/browse/SOLR-11670
>             Project: Solr
>          Issue Type: Sub-task
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: AutoScaling
>            Reporter: Andrzej Bialecki 
>            Assignee: Andrzej Bialecki 
>
> Some high-impact cluster changes (such as split shard) leave the original data and original state that is no longer actively used. This makes sense due to safety reasons and to make it easier to roll-back the changes.
> However, this unused data will accumulate over time, especially when actions like split shard are invoked automatically by the autoscaling framework. We need a periodic task that would clean up this kind of data after a certain period.



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