walterddr commented on code in PR #9753: URL: https://github.com/apache/pinot/pull/9753#discussion_r1019535612
########## pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/executor/OpChainSchedulerService.java: ########## @@ -0,0 +1,147 @@ +/** + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ +package org.apache.pinot.query.runtime.executor; + +import com.google.common.util.concurrent.AbstractExecutionThreadService; +import com.google.common.util.concurrent.Monitor; +import java.util.concurrent.ExecutorService; +import org.apache.pinot.common.request.context.ThreadTimer; +import org.apache.pinot.core.util.trace.TraceRunnable; +import org.apache.pinot.query.mailbox.MailboxIdentifier; +import org.apache.pinot.query.runtime.blocks.TransferableBlock; +import org.apache.pinot.query.runtime.operator.OpChain; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + + +/** + * This class provides the implementation for scheduling multistage queries on a single node based + * on the {@link OpChainScheduler} logic that is passed in. Multistage queries support partial execution + * and will return a NOOP metadata block as a "yield" signal, indicating that the next operator + * chain ({@link OpChainScheduler#next()} will be requested. + * + * <p>Note that a yielded operator chain will be re-registered with the underlying scheduler. + */ +@SuppressWarnings("UnstableApiUsage") +public class OpChainSchedulerService extends AbstractExecutionThreadService { + + private static final Logger LOGGER = LoggerFactory.getLogger(OpChainSchedulerService.class); + + private final OpChainScheduler _scheduler; + private final ExecutorService _workerPool; + + // anything that is guarded by this monitor should be non-blocking + private final Monitor _monitor = new Monitor(); + protected final Monitor.Guard _hasNextOrClosing = new Monitor.Guard(_monitor) { + @Override + public boolean isSatisfied() { + return _scheduler.hasNext() || !isRunning(); + } + }; + + public OpChainSchedulerService(OpChainScheduler scheduler, ExecutorService workerPool) { + _scheduler = scheduler; + _workerPool = workerPool; + } + + @Override + protected void triggerShutdown() { + // this wil just notify all waiters that the scheduler is shutting down + _monitor.enter(); + _monitor.leave(); + } + + @Override + protected void run() + throws Exception { + while (isRunning()) { + _monitor.enterWhen(_hasNextOrClosing); + try { + if (!isRunning()) { + return; + } + + OpChain operatorChain = _scheduler.next(); + _workerPool.submit(new TraceRunnable() { + @Override + public void runJob() { + try { + ThreadTimer timer = operatorChain.getAndStartTimer(); + + // so long as there's work to be done, keep getting the next block + // when the operator chain returns a NOOP block, then yield the execution + // of this to another worker + TransferableBlock result = operatorChain.getRoot().nextBlock(); + while (!result.isNoOpBlock() && !result.isEndOfStreamBlock()) { + LOGGER.debug("Got block with {} rows.", result.getNumRows()); + result = operatorChain.getRoot().nextBlock(); + } + + if (!result.isEndOfStreamBlock()) { + // not complete, needs to re-register for scheduling + register(operatorChain); + } else { + LOGGER.info("Execution time: " + timer.getThreadTimeNs()); + } + } catch (Exception e) { + LOGGER.error("Failed to execute query!", e); + } + } + }); + } finally { + _monitor.leave(); + } + } + } + + /** + * Register a new operator chain with the scheduler. + * + * @param operatorChain the chain to register + */ + public final void register(OpChain operatorChain) { + _monitor.enter(); + try { + _scheduler.register(operatorChain); + } finally { + _monitor.leave(); + } + } + + /** + * This method should be called whenever data is available in a given mailbox. + * Implementations of this method should be idempotent, it may be called in the + * scenario that no mail is available. + * + * @param mailbox the identifier of the mailbox that now has data + */ + public final void onDataAvailable(MailboxIdentifier mailbox) { + _monitor.enter(); + try { + _scheduler.onDataAvailable(mailbox); + } finally { + _monitor.leave(); + } + } + + // TODO: remove this method after we pipe down the proper executor pool to the v1 engine Review Comment: lol should've read this first. good call out. another way is to simple decoupled the executor service used by v1 from v2. i am not sure which is better. -- This is an automated message from the Apache Git Service. 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