[GitHub] [lucene-solr] noblepaul commented on issue #1327: SOLR-13942: /api/cluster/zk/* to fetch raw ZK data

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noblepaul commented on issue #1327: SOLR-13942: /api/cluster/zk/* to fetch raw ZK data
URL: https://github.com/apache/lucene-solr/pull/1327#issuecomment-602304139
 
 
   > Not sure I like the magic switch between returning actual data and returning a list of metdatata simply based on whether a znode happens to have children or not. This is not deterministic. I'd rather have an explicit action, e.g. `GET /api/cluster/zookeeper/collections/_children` to list children for a node, and let pure `GET <path>` calls always return UTF-8 data. Futher, it must be possible to retrieve the metadata of any znode. The existing `/admin/zookeeper` API returns both metadata (ctime etc), utf-8 data and children in the same response. So consider either a `GET /api/cluster/zookeeper/collections/_metadata` call, or putting the metadata in HTTP headers `X-solr-zkmeta-ctime: foo`?
   > 
   > An example to show the problem is the `/collections` znode which happens to have no children on a clean node after install. Try this:
   > 
   > ```
   > docker run --rm -ti solr:8.4.1 bash
   > solr start -c
   > curl "http://localhost:8983/solr/admin/zookeeper?path=/collections&detail=true"
   > ```
   > 
   > It will return `children_count:0`. Your current impl would just return the data of that node, i.e. an empty string, but after creating the first collection it would return a list, and you'd need to add `leaf=true` to get to the data, which is very inconsistent.
   
   I changed it to have 2 paths
   * `/api/cluster/zk-data`
   * `/api/cluster/zk-ls` 
   
   There is no reason for ambiguity

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