[jira] [Commented] (SOLR-12827) Migrate cluster wide defaults syntax in cluster properties to a nested structure

["Shalin Shekhar Mangar (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-12827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16638029#comment-16638029 ] 

Shalin Shekhar Mangar commented on SOLR-12827:
----------------------------------------------

This patch migrates the nested cluster properties format to:
{code}
{
  "defaults" : {
    "collection": {
      "numShards": 2,
      "numNrtReplicas": 2,
    }
  }
}
{code}

The old format can be read from ZK. It can also be written using the APIs. However, it is auto-converted to the new format on reads and writes. We can get rid of the conversion logic in Solr 9.

The patch also updates the reference guide to mention only the new format. I added a note saying that the old API syntax continues to be supported but it will be auto-converted.

I'll commit once tests and precommit pass.

> Migrate cluster wide defaults syntax in cluster properties to a nested structure
> --------------------------------------------------------------------------------
>
>                 Key: SOLR-12827
>                 URL: https://issues.apache.org/jira/browse/SOLR-12827
>             Project: Solr
>          Issue Type: Task
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: SolrCloud
>            Reporter: Shalin Shekhar Mangar
>            Priority: Major
>             Fix For: 7.6, master (8.0)
>
>         Attachments: SOLR-12827.patch
>
>
> SOLR-12387 introduced cluster wide defaults for collection properties. However, the syntax committed is flat and ugly e.g. collectionDefaults instead of defaults/collection inspite of the latter being proposed by Andrzej. Anyway, we should change the format now before it sees widespread use. I propose to fix documentation to describe the new format and auto-convert cluster properties to new syntax on startup.



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