ifesdjeen commented on code in PR #3431:
URL: https://github.com/apache/cassandra/pull/3431#discussion_r1688042616
##########
src/java/org/apache/cassandra/journal/Journal.java:
##########
@@ -112,31 +116,92 @@ public class Journal<K, V> implements Shutdownable
private final WaitQueue segmentPrepared = newWaitQueue();
private final WaitQueue allocatorThreadWaitQueue = newWaitQueue();
private final BooleanSupplier allocatorThreadWaitCondition = () ->
(availableSegment == null);
+ private final FlusherCallbacks flusherCallbacks;
SequentialExecutorPlus closer;
//private final Set<Descriptor> invalidations =
Collections.newSetFromMap(new ConcurrentHashMap<>());
+ private class FlusherCallbacks implements Flusher.Callbacks
+ {
+ private final Queue<WaitingFor> waitingFor = new
ConcurrentLinkedQueue<>();
+
+ @Override
+ public void onFlush(long segment, int position)
+ {
+ Iterator<WaitingFor> iter = waitingFor.iterator();
+ while (iter.hasNext())
+ {
+ WaitingFor wait = iter.next();
+ if (wait.segment == segment && wait.position <= position)
+ {
+ wait.run();
+ iter.remove();
+ }
+ }
+ }
+
+ @Override
+ public void onFlushFailed(Throwable cause)
+ {
+ // TODO: panic
+ }
+
+ public void submit(RecordPointer pointer, Runnable runnable)
+ {
+ WaitingFor wait = new WaitingFor(pointer.segment,
pointer.position, runnable);
+ waitingFor.add(wait);
+ if (isFlushed(pointer))
+ wait.run();
+ }
+ }
+
+ private static class WaitingFor extends RecordPointer implements Runnable
+ {
+ private final AtomicReference<Runnable> onFlushed;
Review Comment:
Yeah; the intention here was to make sure that we run the runnable only
once. You are of course right that it journal thread will promptly catch up any
that could have run immediately.
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