loserwang1024 commented on code in PR #1443:
URL: https://github.com/apache/fluss/pull/1443#discussion_r2247030051
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fluss-client/src/main/java/com/alibaba/fluss/client/table/scanner/log/RemoteLogDownloader.java:
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@@ -140,44 +137,55 @@ void recycleRemoteLog(RemoteLogSegment segment) {
* to fetch.
*/
void fetchOnce() throws Exception {
- // wait until there is a remote fetch request
- RemoteLogDownloadRequest request = segmentsToFetch.poll(pollTimeout,
TimeUnit.MILLISECONDS);
- if (request == null) {
+ int availablePermits = prefetchSemaphore.availablePermits();
+ List<RemoteLogDownloadRequest> requests = new
ArrayList<>(availablePermits);
+ segmentsToFetch.drainTo(requests, availablePermits);
+ if (requests.size() <= 0) {
+ Thread.sleep(pollSleepTimeout);
return;
}
- // blocks until there is capacity (the fetched file is consumed)
- prefetchSemaphore.acquire();
+
+ prefetchSemaphore.acquire(requests.size());
Review Comment:
If the remoteLogDownloader is just a single thread, maybe a `Semaphore` is
no need? Maybe a simple `EMPTY` condition is enough.
What is availablePermits is 8 while segmentsToFetch is just 4, then the
thread will be blocked here.
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