jasperjiaguo commented on code in PR #9171:
URL: https://github.com/apache/pinot/pull/9171#discussion_r942950227
##########
pinot-core/src/main/java/org/apache/pinot/core/query/scheduler/QueryScheduler.java:
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@@ -103,7 +115,68 @@ public QueryScheduler(PinotConfiguration config,
QueryExecutor queryExecutor, Re
* @return Listenable future for query result representing serialized
response. It is possible that the
* future may return immediately or be scheduled for execution at a later
time.
*/
- public abstract ListenableFuture<byte[]> submit(ServerQueryRequest
queryRequest);
+ public ListenableFuture<byte[]> submit(ServerQueryRequest queryRequest) {
+ ListenableFuture<byte[]> future = submitInternal(queryRequest);
+ if (_enableQueryCancellation) {
+ String queryId = queryRequest.getQueryId();
+ // Track the running query for cancellation.
+ if (LOGGER.isDebugEnabled()) {
+ LOGGER.debug("Keep track of running query: {}", queryId);
+ }
+ _queryFuturesById.put(queryId, future);
+ // And remove the track when the query ends.
+ Futures.addCallback(future, new FutureCallback<byte[]>() {
+ @Override
+ public void onSuccess(@Nullable byte[] ignored) {
+ if (LOGGER.isDebugEnabled()) {
+ LOGGER.debug("Remove track of running query: {} on success",
queryId);
+ }
+ _queryFuturesById.remove(queryId);
+ }
+
+ @Override
+ public void onFailure(Throwable ignored) {
+ if (LOGGER.isDebugEnabled()) {
+ LOGGER.debug("Remove track of running query: {} on failure",
queryId);
+ }
+ _queryFuturesById.remove(queryId);
+ }
+ }, MoreExecutors.directExecutor());
+ }
+ return future;
+ }
+
+ protected abstract ListenableFuture<byte[]>
submitInternal(ServerQueryRequest queryRequest);
+
+ /**
+ * Cancel a query as identified by the queryId. This method is non-blocking
and the query may still run for a while
+ * after calling this method. This method can be called multiple times.
+ *
+ * @param queryId a unique Id to find the query
+ * @return true if a running query exists for the given queryId.
+ */
+ public boolean cancelQuery(String queryId) {
+ // Keep the future as it'll be cleaned up by the thread executing the
query.
+ Future<byte[]> future = _queryFuturesById.get(queryId);
+ if (future == null) {
+ return false;
+ }
+ boolean done = future.isDone();
+ if (!done) {
+ future.cancel(true);
Review Comment:
Hey, we plan to use the same cancellation mechanism for cpu time/memory
usage based query pre-emption. Do you think the current frequency of checking
on `if (Thread.interrupted())` at each `nextBlock()` is insufficient to
preempt a query in timely manner @npawar ?
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