psalagnac commented on PR #1729:
URL: https://github.com/apache/solr/pull/1729#issuecomment-1611742408
Following our offline discussion, adding details here on my point about the
thread starvation.
When running a core admin request in async mode, they are all done by a
thread pool defined in `CoreAdminHandler`.
```
private ExecutorService parallelExecutor =
ExecutorUtil.newMDCAwareFixedThreadPool(
50, new
SolrNamedThreadFactory("parallelCoreAdminAPIBaseExecutor"));
```
If we block many core snapshots (or any other core operation) with a
semaphore, we'll have the next eventual operations that may not be processed
immediately, even if they should (for example, a large backup may block a
collection creation).
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