[jira] [Created] (SOLR-17160) Bulk admin operations may fail because of max tracked requests

["Pierre Salagnac (Jira)" <ji...@apache.org>]

Pierre Salagnac created SOLR-17160:
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             Summary: Bulk admin operations may fail because of max tracked requests
                 Key: SOLR-17160
                 URL: https://issues.apache.org/jira/browse/SOLR-17160
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
          Components: Backup/Restore
    Affects Versions: 8.11, 9.5
            Reporter: Pierre Salagnac


In {{{}CoreAdminHandler{}}}, we maintain in-memory the list of in-flight requests and completed/failed request.

_Note they are core/replica level async requests, and not top level requests which mostly at the collection level. Top level requests are tracked by storing the async ID in a Zookeeper node, which is not related to this ticket._

 

For completed/failed requests, we only track a maximum of 100 requests by dropping the oldest ones. The typical client in {{CollectionHandlingUtils.waitForCoreAdminAsyncCallToComplete()}} polls status of the submitted requests, with a retry loop until requests are completed. If for some reason we have more than 100 requests that complete or fail on a node before all statuses are polled by the client, the statuses are lost and the client will fail with an unexpected error similar to:

{{Invalid status request for requestId: '{_}<id>{_}' - 'notfound'. Retried _<n>_ times}}

 

Instead of having a hard limit for the number of requests we track, we could have time based eviction. I think it makes sense to keep status of a request until a given timeout, and then drop it ignoring how many requests we currently track.



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