i3wangyi commented on a change in pull request #367: Add transient cache for
CustomRestClient implementation
URL: https://github.com/apache/helix/pull/367#discussion_r309460673
##########
File path:
helix-rest/src/main/java/org/apache/helix/rest/client/CustomRestClientImpl.java
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@@ -97,7 +111,15 @@ public CustomRestClientImpl(HttpClient httpClient) {
kv -> result.put(kv.getKey(),
kv.getValue().get(IS_HEALTHY_FIELD).asBoolean()));
return result;
};
- return handleResponse(post(url, payLoads), jsonConverter);
+ try {
+ _semaphore.acquire();
+ return handleResponse(post(url, payLoads), jsonConverter);
+ } catch (InterruptedException e) {
+ LOG.warn("Interrupted while acquiring the semaphore", e);
+ } finally {
+ _semaphore.release();
Review comment:
It is the partition check method. Semaphore allows multiple threads
submitting the requests while a single condition can allow up to one(and then
it becomes sequential calls), if it's a high volume traffics, performance is
not good enough.
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