ben-manes commented on pull request #230:
URL: https://github.com/apache/solr/pull/230#issuecomment-888786654
The common pool is a nice default, but due to blocking I/O it is easy for
the workers to be saturated and the system idle. You might want a dedicated
pool to avoid surprising degradations due to foreign code's usage of this
shared resource. Otherwise, if you wanted to avoid running the future on a
thread pool and use a caller thread, you could complete the future manually
using a similar pattern to your original code.
```java
var future = new CompletableFuture<V>();
var result = asyncCache.asMap().putIfAbsent(key, future);
if (result != null) {
return result.join();
}
try {
V value = // do work
future.complete(value);
return value;
} catch (Throwable t) {
future.completeExceptionally(t);
throw t;
}
```
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