ascherbakoff commented on code in PR #4808:
URL: https://github.com/apache/ignite-3/pull/4808#discussion_r1863082106
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modules/core/src/main/java/org/apache/ignite/internal/hlc/HybridClockImpl.java:
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@@ -111,20 +111,30 @@ public final HybridTimestamp current() {
*/
@Override
public final HybridTimestamp update(HybridTimestamp requestTime) {
- while (true) {
- long now = currentTime();
+ long requestTimeLong = requestTime.longValue();
+ while (true) {
// Read the latest time after accessing UTC time to reduce
contention.
- long oldLatestTime = latestTime;
+ long oldLatestTime = this.latestTime;
- long newLatestTime = max(requestTime.longValue() + 1, max(now,
oldLatestTime + 1));
+ if (oldLatestTime >= requestTimeLong) {
+ return hybridTimestamp(LATEST_TIME.incrementAndGet(this));
+ }
- // TODO https://issues.apache.org/jira/browse/IGNITE-23707 avoid
CAS on logical part update.
+ long now = currentTime();
+
+ if (now > requestTimeLong) {
+ if (LATEST_TIME.compareAndSet(this, oldLatestTime, now)) {
+ return hybridTimestamp(now);
+ }
+ } else {
+ long newLatestTime = requestTimeLong + 1;
- if (LATEST_TIME.compareAndSet(this, oldLatestTime, newLatestTime))
{
- notifyUpdateListeners(newLatestTime);
+ if (LATEST_TIME.compareAndSet(this, oldLatestTime,
newLatestTime)) {
Review Comment:
incrementAndGet definitely works better under contention.
We should introduce a microbenchmark specific to clock.
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