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Posted to commits@pinot.apache.org by GitBox <gi...@apache.org> on 2022/03/30 15:24:39 UTC
[GitHub] [pinot] walterddr commented on a change in pull request #8412: add pinot-query-runtime
walterddr commented on a change in pull request #8412:
URL: https://github.com/apache/pinot/pull/8412#discussion_r838632119
##########
File path: pinot-common/src/main/proto/mailbox.proto
##########
@@ -0,0 +1,55 @@
+//
+// 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.
+//
+
+/**
+ * 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.
+ */
+syntax = "proto3";
+
+package org.apache.pinot.common.proto;
+
+service PinotMailbox {
+ rpc open(stream MailboxContent) returns (stream MailboxStatus);
+}
+
+message MailboxStatus {
+ string mailboxId = 1;
Review comment:
it is for debuggability purpose. we could use a hash function to compute from the mailboxID to a hash if performance is of concern.
##########
File path: pinot-common/src/main/proto/worker.proto
##########
@@ -0,0 +1,75 @@
+//
+// 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.
+//
+
+/**
+ * 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.
+ */
+syntax = "proto3";
+
+package org.apache.pinot.common.proto;
+
+service PinotQueryWorker {
+ rpc Submit(QueryRequest) returns (QueryResponse);
+}
+
+message QueryRequest {
+ map<string, string> metadata = 1;
+ QueryPlan queryPlan = 2;
+}
+
+message QueryResponse {
+ map<string, string> metadata = 1;
+ bytes payload = 2;
+}
+
+message QueryPlan {
+ string stageId = 1;
+ string instanceId = 2;
Review comment:
yes StageId should be INT. I will make that change along with this PR.
instanceId cannot be as it is a stringify format of the `ServerInstance`
##########
File path: pinot-common/src/main/proto/worker.proto
##########
@@ -0,0 +1,75 @@
+//
+// 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.
+//
+
+/**
+ * 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.
+ */
+syntax = "proto3";
+
+package org.apache.pinot.common.proto;
+
+service PinotQueryWorker {
+ rpc Submit(QueryRequest) returns (QueryResponse);
+}
+
+message QueryRequest {
+ map<string, string> metadata = 1;
+ QueryPlan queryPlan = 2;
+}
+
+message QueryResponse {
+ map<string, string> metadata = 1;
+ bytes payload = 2;
+}
+
+message QueryPlan {
+ string stageId = 1;
+ string instanceId = 2;
+ StagePlan stagePlan = 3;
+ map<string, StageMetadata> stageMetadata = 4;
+}
+
+message StagePlan {
+ bytes serializedStagePlan = 1;
+}
+
+message StageMetadata {
+ repeated string instances = 1;
+ repeated string scannedTables = 2;
+ map<string, SegmentMetadata> segmentMetadata = 3;
+}
Review comment:
this is the same as the current server instance to segment list map.
however i can't add a `map<string, repeated string>` in proto so I need to wrap the list of segment names into `SegmentMetadata`.
maybe I should rename it to `SegmentNameList`?
##########
File path: pinot-common/src/main/proto/worker.proto
##########
@@ -0,0 +1,75 @@
+//
+// 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.
+//
+
+/**
+ * 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.
+ */
+syntax = "proto3";
+
+package org.apache.pinot.common.proto;
+
+service PinotQueryWorker {
+ rpc Submit(QueryRequest) returns (QueryResponse);
+}
+
+message QueryRequest {
+ map<string, string> metadata = 1;
+ QueryPlan queryPlan = 2;
+}
+
+message QueryResponse {
+ map<string, string> metadata = 1;
+ bytes payload = 2;
+}
+
+message QueryPlan {
+ string stageId = 1;
Review comment:
here QueryPlan is actually StagePlan. renaming it to QueryStagePlan.
##########
File path: pinot-common/src/main/proto/worker.proto
##########
@@ -0,0 +1,75 @@
+//
+// 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.
+//
+
+/**
+ * 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.
+ */
+syntax = "proto3";
+
+package org.apache.pinot.common.proto;
+
+service PinotQueryWorker {
+ rpc Submit(QueryRequest) returns (QueryResponse);
+}
+
+message QueryRequest {
+ map<string, string> metadata = 1;
Review comment:
not really optional since some of the physical info has to go over metadata (like broker address / metrics prefix) but yeah I can make it optional since technically you can run without the metadata.
##########
File path: pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/blocks/DataTableBlock.java
##########
@@ -0,0 +1,73 @@
+/**
+ * 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.blocks;
+
+import java.io.IOException;
+import org.apache.pinot.common.utils.DataTable;
+import org.apache.pinot.core.common.Block;
+import org.apache.pinot.core.common.BlockDocIdSet;
+import org.apache.pinot.core.common.BlockDocIdValueSet;
+import org.apache.pinot.core.common.BlockMetadata;
+import org.apache.pinot.core.common.BlockValSet;
+import org.apache.pinot.core.operator.blocks.InstanceResponseBlock;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+/**
+ * A {@code DataTableBlock} is a row-based data block backed by a {@link DataTable}.
+ */
+public class DataTableBlock implements Block {
Review comment:
good idea. let's put a TODO (or design discussion section on this)
##########
File path: pinot-common/src/main/proto/worker.proto
##########
@@ -0,0 +1,75 @@
+//
+// 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.
+//
+
+/**
+ * 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.
+ */
+syntax = "proto3";
+
+package org.apache.pinot.common.proto;
+
+service PinotQueryWorker {
+ rpc Submit(QueryRequest) returns (QueryResponse);
+}
+
Review comment:
so I purposefully not use Broker/Server concept but Worker/Mailbox because.
1. technically speaking a Worker can be Broker (Worker without local segments) or Server (Worker with local segments).
2. It makes more sense to differentiate whether a proto defines controll flow (Worker) or data flow (Mailbox)
I will add more comment to the proto files.
##########
File path: pinot-common/src/main/proto/worker.proto
##########
@@ -0,0 +1,75 @@
+//
+// 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.
+//
+
+/**
+ * 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.
+ */
+syntax = "proto3";
+
+package org.apache.pinot.common.proto;
+
+service PinotQueryWorker {
+ rpc Submit(QueryRequest) returns (QueryResponse);
+}
+
+message QueryRequest {
+ map<string, string> metadata = 1;
+ QueryPlan queryPlan = 2;
+}
+
+message QueryResponse {
+ map<string, string> metadata = 1;
+ bytes payload = 2;
+}
+
+message QueryPlan {
+ string stageId = 1;
+ string instanceId = 2;
+ StagePlan stagePlan = 3;
+ map<string, StageMetadata> stageMetadata = 4;
+}
+
+message StagePlan {
+ bytes serializedStagePlan = 1;
+}
+
+message StageMetadata {
+ repeated string instances = 1;
Review comment:
not sure what this mean. could you clarify a bit more regarding this comment?
As in my design, once the job has been dispatched. all communication are between executors (of different machines)
##########
File path: pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/plan/DistributedQueryPlan.java
##########
@@ -0,0 +1,74 @@
+/**
+ * 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.plan;
+
+import java.io.Serializable;
+import java.util.HashMap;
+import java.util.Map;
+import org.apache.pinot.core.transport.ServerInstance;
+import org.apache.pinot.query.planner.StageMetadata;
+import org.apache.pinot.query.planner.nodes.StageNode;
+
+
+/**
+ * WorkerQueryRequest is the extended version of the {@link org.apache.pinot.core.query.request.ServerQueryRequest}.
+ */
+public class DistributedQueryPlan implements Serializable {
+ private final String _stageId;
+ private ServerInstance _serverInstance;
+ private StageNode _stageRoot;
+ private Map<String, StageMetadata> _metadataMap;
Review comment:
> I think we need to revisit this abstraction. It looks very confusing here
>
> Multi-stage `QueryPlan` built at broker comprises of multiple stages. Since each `StageNode` will be executed on some executor / server, that information must already be available at the time of building the QueryPlan.
you are absolutely right.
so QueryPlan already contains the entire "physical" plan of the multi-stage execution.
>
> So, then why should the information about `serverInstance` be tracked separately ? In fact, we are tracking it in both `StageMetadata` and then again outside here in the deserialized plan.
DistributedQueryPlan is actually "ONE STAGE OF" the QueryPlan (or I think we should rename it DistributableStagePlan). and yes again you are right this should be in some sort of serializable format.
>
> The `StageNode` should be self-contained ideally
>
> * root or leaf stage
> * stageId
> * operator tree
> * executor assignment
all the 4 components you describe above is assigned to a stage, not a stageNode. thus the split between StageNode _root; and StageMetadata.
##########
File path: pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/operator/BroadcastJoinOperator.java
##########
@@ -0,0 +1,162 @@
+/**
+ * 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.operator;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import javax.annotation.Nullable;
+import org.apache.pinot.common.utils.DataSchema;
+import org.apache.pinot.common.utils.DataTable;
+import org.apache.pinot.core.common.Operator;
+import org.apache.pinot.core.operator.BaseOperator;
+import org.apache.pinot.core.query.selection.SelectionOperatorUtils;
+import org.apache.pinot.query.planner.partitioning.KeySelector;
+import org.apache.pinot.query.runtime.blocks.DataTableBlock;
+import org.apache.pinot.query.runtime.blocks.DataTableBlockUtils;
+
+
+/**
+ * This basic {@code BroadcastJoinOperator} implement a basic broadcast join algorithm.
+ *
+ * <p>It takes the right table as the broadcast side and materialize a hash table. Then for each of the left table row,
+ * it looks up for the corresponding row(s) from the hash table and create a joint row.
+ *
+ * <p>For each of the data block received from the left table, it will generate a joint data block.
+ */
+public class BroadcastJoinOperator extends BaseOperator<DataTableBlock> {
+
+ private final HashMap<Object, List<Object[]>> _broadcastHashTable;
+ private final BaseOperator<DataTableBlock> _leftTableOperator;
+ private final BaseOperator<DataTableBlock> _rightTableOperator;
+
+ private DataSchema _leftTableSchema;
+ private DataSchema _rightTableSchema;
+ private int _resultRowSize;
+ private boolean _isHashTableBuilt;
+ private KeySelector<Object[], Object> _leftKeySelector;
+ private KeySelector<Object[], Object> _rightKeySelector;
+
+ public BroadcastJoinOperator(BaseOperator<DataTableBlock> leftTableOperator,
+ BaseOperator<DataTableBlock> rightTableOperator, KeySelector<Object[], Object> leftKeySelector,
+ KeySelector<Object[], Object> rightKeySelector) {
+ // TODO: this assumes right table is broadcast.
+ _leftKeySelector = leftKeySelector;
+ _rightKeySelector = rightKeySelector;
+ _leftTableOperator = leftTableOperator;
+ _rightTableOperator = rightTableOperator;
+ _isHashTableBuilt = false;
+ _broadcastHashTable = new HashMap<>();
+ }
+
+ @Override
+ public String getOperatorName() {
+ return null;
Review comment:
good catch will update
##########
File path: pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/plan/DistributedQueryPlan.java
##########
@@ -0,0 +1,74 @@
+/**
+ * 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.plan;
+
+import java.io.Serializable;
+import java.util.HashMap;
+import java.util.Map;
+import org.apache.pinot.core.transport.ServerInstance;
+import org.apache.pinot.query.planner.StageMetadata;
+import org.apache.pinot.query.planner.nodes.StageNode;
+
+
+/**
+ * WorkerQueryRequest is the extended version of the {@link org.apache.pinot.core.query.request.ServerQueryRequest}.
Review comment:
actually importing the class ServerQueryRequest but only use it in javadoc causes checkstyle to complain. let me see what can be changed
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