[GitHub] [pulsar] candlerb opened a new issue #5539: Bulk admin operations for function state

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candlerb opened a new issue #5539: Bulk admin operations for function state
URL: https://github.com/apache/pulsar/issues/5539
 
 
   **Is your feature request related to a problem? Please describe.**
   At the moment you can only `querystate` if you know in advance the name of the key you're looking for.
   
   So I would like to be able to:
   * List / iterate over all stored state belonging to a function
   * Delete all stored state belonging to a function
   
   It is apparently possible via bk interfaces.
   
   **Describe the solution you'd like**
   Add commands to pulsar-admin / REST API
   
   * list all keys/values (which could be millions of keys; would need some sort of paging mechanism in the API)
   
       I noticed[^1] that `GET /admin/v3/functions/public/default/<functionname>/state` (without a key) currently returns a 404 - maybe it could be used to return the first N key/value pairs
   
   * Delete all state for a given function
   
       Note: whilst the Pulsar functions context object has `deleteState`, there is currently no way from the CLI to delete even a single key, so that ought to be rectified too.
   
   **Describe alternatives you've considered**
   Document the bk way of doing this, with examples.
   
   -----
   
   [^1] Found using pulsarctl:
   
   ```
   ./pulsarctl functions querystate --name womble
   error: Unknown pulsar error
   ```
   
   and tcpdump:
   
   ```
   GET /admin/v3/functions/public/default/womble/state HTTP/1.1
   Host: localhost:8080
   User-Agent: Pulsarctl-Go-v0.1.0
   Accept: application/json
   Content-Type: application/json
   Accept-Encoding: gzip
   
   HTTP/1.1 404 Not Found
   Date: Sat, 02 Nov 2019 08:27:18 GMT
   Cache-Control: must-revalidate,no-cache,no-store
   Content-Length: 0
   Server: Jetty(9.4.12.v20180830)
   ```
   

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