atris commented on a change in pull request #1686:
URL: https://github.com/apache/lucene-solr/pull/1686#discussion_r466918853
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File path: solr/core/src/java/org/apache/solr/servlet/RequestRateLimiter.java
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@@ -53,6 +53,8 @@ public boolean handleRequest() throws InterruptedException {
* Whether to allow another request type to borrow a slot from this request
rate limiter. Typically works fine
* if there is a relatively lesser load on this request rate limiter's type
compared to the others (think of skew).
* @return true if allow, false otherwise
+ *
+ * @lucene.experimental -- Can cause slots to be blocked if a request
borrows a slot and is itself long lived.
*/
public boolean allowSlotBorrowing() {
synchronized (this) {
Review comment:
Good point. I was not sure around using availablePermits for this use
but decided for using it. IMO the worst that can happen is that a request gets
an indication from availablePermits as to the availability of a slot but fails
to acquire it since another concurrent request has acquired the same. The
approach that you suggest is more comprehensive, so changed to that, thanks.
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