Jackie-Jiang commented on code in PR #11411:
URL: https://github.com/apache/pinot/pull/11411#discussion_r1303409129
##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/plan/pipeline/PipelineBreakerOperator.java:
##########
@@ -62,70 +55,55 @@ public Map<Integer, List<TransferableBlock>> getResultMap()
{
}
@Nullable
+ public TransferableBlock getErrorBlock() {
+ return _errorBlock;
+ }
+
@Override
public String toExplainString() {
return EXPLAIN_NAME;
}
@Override
protected TransferableBlock getNextBlock() {
- // Poll from every mailbox operator:
- // - Return the first content block
- // - If no content block found but there are mailboxes not finished, try
again
- // - If all content blocks are already returned, return end-of-stream block
- while (!_workerEntries.isEmpty()) {
- if (_finalBlock != null) {
- return _finalBlock;
- }
- if (System.currentTimeMillis() > _context.getDeadlineMs()) {
- _finalBlock =
TransferableBlockUtils.getErrorTransferableBlock(QueryException.EXECUTION_TIMEOUT_ERROR);
- constructErrorResponse(_finalBlock);
- return _finalBlock;
- }
-
- Map.Entry<Integer, Operator<TransferableBlock>> worker =
_workerEntries.getLast();
- TransferableBlock block = worker.getValue().nextBlock();
-
- if (block == null) {
- if (LOGGER.isDebugEnabled()) {
- LOGGER.debug("==[PB]== Null block on " + _context.getId() + " worker
" + worker.getKey());
+ if (_errorBlock != null) {
+ return _errorBlock;
+ }
+ // NOTE: Put an empty list for each worker in case there is no data block
returned from that worker
+ if (_workerMap.size() == 1) {
+ Map.Entry<Integer, Operator<TransferableBlock>> entry =
_workerMap.entrySet().iterator().next();
+ List<TransferableBlock> dataBlocks = new ArrayList<>();
+ _resultMap = Collections.singletonMap(entry.getKey(), dataBlocks);
+ Operator<TransferableBlock> operator = entry.getValue();
+ TransferableBlock block = operator.nextBlock();
+ while (!block.isSuccessfulEndOfStreamBlock()) {
+ if (block.isErrorBlock()) {
+ _errorBlock = block;
+ return block;
}
- continue;
+ dataBlocks.add(block);
+ block = operator.nextBlock();
}
-
- // Release the mailbox worker when the block is end-of-stream
- if (block.isSuccessfulEndOfStreamBlock()) {
- _workerEntries.removeLast();
- continue;
+ } else {
+ _resultMap = new HashMap<>();
+ for (int workerKey : _workerMap.keySet()) {
+ _resultMap.put(workerKey, new ArrayList<>());
}
-
- if (block.isErrorBlock()) {
- _finalBlock = block;
- }
- if (LOGGER.isTraceEnabled()) {
- LOGGER.trace("==[PB]== Returned block from : " + _context.getId() + "
block: " + block);
- }
- _resultMap.get(worker.getKey()).add(block);
- return block;
- }
- if (System.currentTimeMillis() > _context.getDeadlineMs()) {
- _finalBlock =
TransferableBlockUtils.getErrorTransferableBlock(QueryException.EXECUTION_TIMEOUT_ERROR);
- return _finalBlock;
- } else if (_finalBlock == null) {
- if (LOGGER.isDebugEnabled()) {
- LOGGER.debug("==[PB]== Finished : " + _context.getId());
+ // Keep polling from every operator in round-robin fashion
+ Queue<Map.Entry<Integer, Operator<TransferableBlock>>> entries = new
ArrayDeque<>(_workerMap.entrySet());
+ while (!entries.isEmpty()) {
+ Map.Entry<Integer, Operator<TransferableBlock>> entry = entries.poll();
+ TransferableBlock block = entry.getValue().nextBlock();
+ if (block.isErrorBlock()) {
+ _errorBlock = block;
+ return block;
+ }
+ if (block.isDataBlock()) {
+ _resultMap.get(entry.getKey()).add(block);
+ entries.offer(entry);
+ }
Review Comment:
It is tracked within the op-chain
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