Jackie-Jiang commented on code in PR #15143:
URL: https://github.com/apache/pinot/pull/15143#discussion_r1975980844
##########
pinot-spi/src/main/java/org/apache/pinot/spi/utils/CommonConstants.java:
##########
@@ -248,6 +248,9 @@ public static class Instance {
public static final String
CONFIG_OF_MULTI_STAGE_ENGINE_MAX_SERVER_QUERY_THREADS =
"pinot.beta.multistage.engine.max.server.query.threads";
public static final String
DEFAULT_MULTI_STAGE_ENGINE_MAX_SERVER_QUERY_THREADS = "-1";
+ public static final String
CONFIG_OF_MULTI_STAGE_ENGINE_MAX_SERVER_QUERY_HARDLIMIT_FACTOR =
+
"pinot.beta.multistage.engine.max.server.query.threads.hardlimit.factor";
+ public static final String
DEFAULT_MULTI_STAGE_ENGINE_MAX_SERVER_QUERY_HARDLIMIT_FACTOR = "4";
Review Comment:
I feel a fixed number would be easier to understand.
With current behavior, if user somehow put `-1` as the factor because they
want to disable this, it will end up enabling the hard limit with 1 thread
##########
pinot-core/src/main/java/org/apache/pinot/core/query/executor/ServerQueryExecutorV1Impl.java:
##########
@@ -125,8 +125,8 @@ public synchronized void init(PinotConfiguration config,
InstanceDataManager ins
_planMaker.init(config);
_defaultTimeoutMs = config.getProperty(Server.TIMEOUT,
Server.DEFAULT_QUERY_EXECUTOR_TIMEOUT_MS);
_enablePrefetch =
Boolean.parseBoolean(config.getProperty(ENABLE_PREFETCH));
- LOGGER.info("Initialized query executor with defaultTimeoutMs: {},
enablePrefetch: {}", _defaultTimeoutMs,
- _enablePrefetch);
+ LOGGER.info("Initialized query executor with defaultTimeoutMs: {},
enablePrefetch: {}",
+ _defaultTimeoutMs, _enablePrefetch);
Review Comment:
(format) Per the changes in this file, I believe your IDE is not properly
setup with [Pinot
Style](https://docs.pinot.apache.org/developers/developers-and-contributors/code-setup?q=null#set-up-ide)
##########
pinot-spi/src/main/java/org/apache/pinot/spi/executor/HardLimitExecutor.java:
##########
@@ -0,0 +1,94 @@
+/**
+ * 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.spi.executor;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.atomic.AtomicInteger;
+import org.apache.pinot.spi.env.PinotConfiguration;
+import org.apache.pinot.spi.utils.CommonConstants;
+
+
+/**
+ * An Executor that allows a maximum of tasks running at the same time,
rejecting immediately any excess.
+ */
+public class HardLimitExecutor extends DecoratorExecutorService {
+
+ private final AtomicInteger _running;
+ private final int _max;
+
+ public HardLimitExecutor(int max, ExecutorService executorService) {
+ super(executorService);
+ _running = new AtomicInteger(0);
+ _max = max;
+ }
+
+ /**
+ * Returns the hard limit of the number of threads that can be used by the
multi-stage executor.
+ * @param config Pinot configuration
+ * @return hard limit of the number of threads that can be used by the
multi-stage executor (no hard limit if <= 0)
+ */
+ public static int getMultiStageExecutorHardLimit(PinotConfiguration config) {
+ try {
+ return Integer.parseInt(config.getProperty(
+
CommonConstants.Helix.CONFIG_OF_MULTI_STAGE_ENGINE_MAX_SERVER_QUERY_THREADS,
+
CommonConstants.Helix.DEFAULT_MULTI_STAGE_ENGINE_MAX_SERVER_QUERY_THREADS
+ )) * Integer.parseInt(config.getProperty(
+
CommonConstants.Helix.CONFIG_OF_MULTI_STAGE_ENGINE_MAX_SERVER_QUERY_HARDLIMIT_FACTOR,
+
CommonConstants.Helix.DEFAULT_MULTI_STAGE_ENGINE_MAX_SERVER_QUERY_HARDLIMIT_FACTOR
+ ));
+ } catch (NumberFormatException e) {
+ return
Integer.parseInt(CommonConstants.Helix.DEFAULT_MULTI_STAGE_ENGINE_MAX_SERVER_QUERY_THREADS);
+ }
+ }
+
+ protected void checkTaskAllowed() {
+ if (_running.get() >= _max) {
+ throw new IllegalStateException("Tasks limit exceeded.");
+ }
+ }
+
+ @Override
+ protected <T> Callable<T> decorate(Callable<T> task) {
+ checkTaskAllowed();
+ return () -> {
+ checkTaskAllowed();
+ try {
+ _running.getAndIncrement();
Review Comment:
(minor) Usually we put this outside of `try`
##########
pinot-spi/src/main/java/org/apache/pinot/spi/executor/HardLimitExecutor.java:
##########
@@ -0,0 +1,94 @@
+/**
+ * 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.spi.executor;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.atomic.AtomicInteger;
+import org.apache.pinot.spi.env.PinotConfiguration;
+import org.apache.pinot.spi.utils.CommonConstants;
+
+
+/**
+ * An Executor that allows a maximum of tasks running at the same time,
rejecting immediately any excess.
+ */
+public class HardLimitExecutor extends DecoratorExecutorService {
+
+ private final AtomicInteger _running;
+ private final int _max;
+
+ public HardLimitExecutor(int max, ExecutorService executorService) {
+ super(executorService);
+ _running = new AtomicInteger(0);
+ _max = max;
+ }
+
+ /**
+ * Returns the hard limit of the number of threads that can be used by the
multi-stage executor.
+ * @param config Pinot configuration
+ * @return hard limit of the number of threads that can be used by the
multi-stage executor (no hard limit if <= 0)
+ */
+ public static int getMultiStageExecutorHardLimit(PinotConfiguration config) {
+ try {
+ return Integer.parseInt(config.getProperty(
+
CommonConstants.Helix.CONFIG_OF_MULTI_STAGE_ENGINE_MAX_SERVER_QUERY_THREADS,
+
CommonConstants.Helix.DEFAULT_MULTI_STAGE_ENGINE_MAX_SERVER_QUERY_THREADS
+ )) * Integer.parseInt(config.getProperty(
+
CommonConstants.Helix.CONFIG_OF_MULTI_STAGE_ENGINE_MAX_SERVER_QUERY_HARDLIMIT_FACTOR,
+
CommonConstants.Helix.DEFAULT_MULTI_STAGE_ENGINE_MAX_SERVER_QUERY_HARDLIMIT_FACTOR
+ ));
+ } catch (NumberFormatException e) {
+ return
Integer.parseInt(CommonConstants.Helix.DEFAULT_MULTI_STAGE_ENGINE_MAX_SERVER_QUERY_THREADS);
+ }
+ }
+
+ protected void checkTaskAllowed() {
+ if (_running.get() >= _max) {
+ throw new IllegalStateException("Tasks limit exceeded.");
+ }
+ }
+
+ @Override
+ protected <T> Callable<T> decorate(Callable<T> task) {
+ checkTaskAllowed();
Review Comment:
Do we need to check twice?
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