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This commit avoids unnecessary thread sync of PQ notFull state. (#14129) (#14142)

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When PQ is full, workers wake up writer thread in every read.
However, without removing a fully acked page, queue is still full.
This commit changes the condition of notFull signal.
Fixed: #6801

(cherry picked from commit da68ff3803)

Co-authored-by: kaisecheng <69120390+kaisecheng@users.noreply.github.com>
This commit is contained in:
github-actions[bot] 2022-05-25 14:45:26 +01:00 • committed by GitHub
parent a6cd4bf949
commit 27c512fb17
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1 changed files with 10 additions and 6 deletions
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16
logstash-core/src/main/java/org/logstash/ackedqueue/Queue.java
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@ -509,21 +509,25 @@ public final class Queue implements Closeable {
public boolean isFull() {
lock.lock();
try {
if (this.maxBytes > 0L && isMaxBytesReached()) {
return true;
} else {
return (this.maxUnread > 0 && this.unreadCount >= this.maxUnread);
}
return isMaxBytesReached() || isMaxUnreadReached();
} finally {
lock.unlock();
}
}
private boolean isMaxBytesReached() {
if (this.maxBytes <= 0L) {
return false;
}
final long persistedByteSize = getPersistedByteSize();
return ((persistedByteSize > this.maxBytes) || (persistedByteSize == this.maxBytes && !this.headPage.hasSpace(1)));
}
private boolean isMaxUnreadReached() {
return this.maxUnread > 0 && (this.unreadCount >= this.maxUnread);
}
/**
* Queue is considered empty if it does not contain any tail page and the headpage has no element or all
* elements are acked
@ -636,7 +640,7 @@ public final class Queue implements Closeable {
}
if (! p.isFullyRead()) {
boolean wasFull = isFull();
boolean wasFull = isMaxUnreadReached();
final SequencedList<byte[]> serialized = p.read(left);
int n = serialized.getElements().size();