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[improve][broker] Optimize PersistentTopic.getLastDispatchablePosition #22707

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merged 5 commits into from
Jun 11, 2024
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[improve][broker] Optimize PersistentTopic.getLastDispatchablePosition #22707

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23d484a
Optimize get last dispatchable position.
dao-jun May 14, 2024
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Apply changes to related classes.
dao-jun May 14, 2024
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format
dao-jun May 14, 2024
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dao-jun Jun 10, 2024
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66 changes: 54 additions & 12 deletions pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentTopic.java
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Original file line number Diff line number Diff line change
Expand Up @@ -309,6 +309,9 @@ private static class EstimateTimeBasedBacklogQuotaCheckResult {
Long estimatedOldestUnacknowledgedMessageTimestamp;
}

// The last position that can be dispatched to consumers
private volatile Position lastDispatchablePosition;

/***
* We use 3 futures to prevent a new closing if there is an in-progress deletion or closing. We make Pulsar return
* the in-progress one when it is called the second time.
Expand Down Expand Up @@ -3774,18 +3777,57 @@ public Position getLastPosition() {

@Override
public CompletableFuture<Position> getLastDispatchablePosition() {
return ManagedLedgerImplUtils.asyncGetLastValidPosition((ManagedLedgerImpl) ledger, entry -> {
MessageMetadata md = Commands.parseMessageMetadata(entry.getDataBuffer());
// If a messages has marker will filter by AbstractBaseDispatcher.filterEntriesForConsumer
if (Markers.isServerOnlyMarker(md)) {
return false;
} else if (md.hasTxnidMostBits() && md.hasTxnidLeastBits()) {
// Filter-out transaction aborted messages.
TxnID txnID = new TxnID(md.getTxnidMostBits(), md.getTxnidLeastBits());
return !isTxnAborted(txnID, (PositionImpl) entry.getPosition());
}
return true;
}, getMaxReadPosition());
if (lastDispatchablePosition != null) {
return CompletableFuture.completedFuture(lastDispatchablePosition);
}
return ManagedLedgerImplUtils
.asyncGetLastValidPosition((ManagedLedgerImpl) ledger, entry -> {
MessageMetadata md = Commands.parseMessageMetadata(entry.getDataBuffer());
// If a messages has marker will filter by AbstractBaseDispatcher.filterEntriesForConsumer
if (Markers.isServerOnlyMarker(md)) {
return false;
} else if (md.hasTxnidMostBits() && md.hasTxnidLeastBits()) {
// Filter-out transaction aborted messages.
TxnID txnID = new TxnID(md.getTxnidMostBits(), md.getTxnidLeastBits());
return !isTxnAborted(txnID, (PositionImpl) entry.getPosition());
}
return true;
}, getMaxReadPosition())
.thenApply(position -> {
// Update lastDispatchablePosition to the given position
updateLastDispatchablePosition(position);
return position;
});
}

/**
* Update lastDispatchablePosition if the given position is greater than the lastDispatchablePosition.
*
* @param position
*/
public synchronized void updateLastDispatchablePosition(Position position) {
// Update lastDispatchablePosition to null if the position is null, fallback to
// ManagedLedgerImplUtils#asyncGetLastValidPosition
if (position == null) {
lastDispatchablePosition = null;
return;
}

PositionImpl position0 = (PositionImpl) position;
// If the position is greater than the maxReadPosition, ignore
if (position0.compareTo(getMaxReadPosition()) > 0) {
return;
}
// If the lastDispatchablePosition is null, set it to the position
if (lastDispatchablePosition == null) {
lastDispatchablePosition = position;
return;
}
// If the position is greater than the lastDispatchablePosition, update it
PositionImpl lastDispatchablePosition0 = (PositionImpl) lastDispatchablePosition;
if (position0.compareTo(lastDispatchablePosition0) > 0) {
lastDispatchablePosition = position;
}
}

@Override
Expand Down
14 changes: 12 additions & 2 deletions ...rc/main/java/org/apache/pulsar/broker/transaction/buffer/impl/InMemTransactionBuffer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -377,8 +377,11 @@ public boolean isTxnAborted(TxnID txnID, PositionImpl readPosition) {

@Override
public void syncMaxReadPositionForNormalPublish(PositionImpl position, boolean isMarkerMessage) {
if (!isMarkerMessage && maxReadPositionCallBack != null) {
maxReadPositionCallBack.maxReadPositionMovedForward(null, position);
if (!isMarkerMessage) {
updateLastDispatchablePosition(position);
if (maxReadPositionCallBack != null) {
maxReadPositionCallBack.maxReadPositionMovedForward(null, position);
}
}
}

Expand Down Expand Up @@ -436,4 +439,11 @@ public long getCommittedTxnCount() {
.filter(txnBuffer -> txnBuffer.status.equals(TxnStatus.COMMITTED))
.count();
}

// ThreadSafe
private void updateLastDispatchablePosition(Position position) {
if (topic instanceof PersistentTopic t) {
t.updateLastDispatchablePosition(position);
}
}
}
11 changes: 11 additions & 0 deletions ...rc/main/java/org/apache/pulsar/broker/transaction/buffer/impl/TopicTransactionBuffer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -297,6 +297,11 @@ private void handleTransactionMessage(TxnID txnId, Position position) {
}
}

// ThreadSafe
private void updateLastDispatchablePosition(Position position) {
topic.updateLastDispatchablePosition(position);
}

@Override
public CompletableFuture<TransactionBufferReader> openTransactionBufferReader(TxnID txnID, long startSequenceId) {
return null;
Expand Down Expand Up @@ -459,6 +464,8 @@ void removeTxnAndUpdateMaxReadPosition(TxnID txnID) {
} else {
updateMaxReadPosition((PositionImpl) topic.getManagedLedger().getLastConfirmedEntry(), false);
}
// Update the last dispatchable position to null if there is a TXN finished.
updateLastDispatchablePosition(null);
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@liangyepianzhou liangyepianzhou Jun 11, 2024 •
edited
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Oh, Sorry, I overlooked this. If you do not set it to null here, but set a flag that requires reading BK, you can reduce the response time of the next request. I mentioned here before, but maybe not in detail.

  1. end txn.
  2. set a flag 'readFromBK' as true
  3. update normal message
  4. set a flag 'readFromBK' as false
  5. when call getLastDispatchablePosition, if the flag == true, the lastDispatchablePosition is valid to return. And read from BK after return.
  6. Call getLastDispatchablePosition again, it can get the last getLastDispatchablePosition.

How do you think about this?

}

/**
Expand Down Expand Up @@ -523,6 +530,10 @@ public void syncMaxReadPositionForNormalPublish(PositionImpl position, boolean i
}
}
}
// If the message is a normal message, update the last dispatchable position.
if (!isMarkerMessage) {
updateLastDispatchablePosition(position);
}
}

@Override
Expand Down
14 changes: 12 additions & 2 deletions .../main/java/org/apache/pulsar/broker/transaction/buffer/impl/TransactionBufferDisable.java
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Original file line number Diff line number Diff line change
Expand Up @@ -99,8 +99,11 @@ public boolean isTxnAborted(TxnID txnID, PositionImpl readPosition) {

@Override
public void syncMaxReadPositionForNormalPublish(PositionImpl position, boolean isMarkerMessage) {
if (!isMarkerMessage && maxReadPositionCallBack != null) {
maxReadPositionCallBack.maxReadPositionMovedForward(null, position);
if (!isMarkerMessage) {
updateLastDispatchablePosition(position);
if (maxReadPositionCallBack != null) {
maxReadPositionCallBack.maxReadPositionMovedForward(null, position);
}
}
}

Expand Down Expand Up @@ -148,4 +151,11 @@ public long getAbortedTxnCount() {
public long getCommittedTxnCount() {
return 0;
}

// ThreadSafe
private void updateLastDispatchablePosition(Position position) {
if (topic instanceof PersistentTopic t) {
t.updateLastDispatchablePosition(position);
}
}
}
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