rkondakov commented on a change in pull request #7520: IGNITE-12632: Support of 
cancel command for resource-consuming entities.
URL: https://github.com/apache/ignite/pull/7520#discussion_r395531026
 
 

 ##########
 File path: 
modules/core/src/main/java/org/apache/ignite/internal/QueryMXBeanImpl.java
 ##########
 @@ -0,0 +1,168 @@
+/*
+ * 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.ignite.internal;
+
+import java.util.UUID;
+import org.apache.ignite.IgniteCompute;
+import org.apache.ignite.IgniteLogger;
+import org.apache.ignite.cluster.ClusterNode;
+import org.apache.ignite.internal.cluster.IgniteClusterImpl;
+import org.apache.ignite.internal.util.typedef.T2;
+import org.apache.ignite.internal.util.typedef.internal.A;
+import org.apache.ignite.internal.util.typedef.internal.U;
+import org.apache.ignite.internal.visor.VisorTaskArgument;
+import org.apache.ignite.internal.visor.query.VisorContinuousQueryCancelTask;
+import 
org.apache.ignite.internal.visor.query.VisorContinuousQueryCancelTaskArg;
+import org.apache.ignite.internal.visor.query.VisorQueryCancelTask;
+import org.apache.ignite.internal.visor.query.VisorQueryCancelTaskArg;
+import org.apache.ignite.internal.visor.query.VisorScanQueryCancelTask;
+import org.apache.ignite.internal.visor.query.VisorScanQueryCancelTaskArg;
+import org.apache.ignite.mxbean.QueryMXBean;
+
+import static 
org.apache.ignite.internal.sql.command.SqlKillQueryCommand.parseGlobalQueryId;
+
+/**
+ * QueryMXBean implementation.
+ */
+public class QueryMXBeanImpl implements QueryMXBean {
+    /** */
+    public static final String EXPECTED_GLOBAL_QRY_ID_FORMAT = "Global query 
id should have format " +
+        "'{node_id}_{query_id}', e.g. 
'6fa749ee-7cf8-4635-be10-36a1c75267a7_54321'";
+
+    /** */
+    private final GridKernalContext ctx;
+
+    /** */
+    private final IgniteLogger log;
+
+    /**
+     * @param ctx Context.
+     */
+    public QueryMXBeanImpl(GridKernalContext ctx) {
+        this.ctx = ctx;
+        this.log = ctx.log(QueryMXBeanImpl.class);
+    }
+
+    /** {@inheritDoc} */
+    @Override public void cancelContinuous(String routineId) {
+        A.notNull(routineId, "routineId");
+
+        cancelContinuous(UUID.fromString(routineId));
+    }
+
+    /** {@inheritDoc} */
+    @Override public void cancelSQL(String id) {
+        A.notNull(id, "id");
+
+        if (log.isInfoEnabled())
+            log.info("Killing sql query[id=" + id + ']');
+
+        boolean res;
+
+        try {
+            IgniteClusterImpl cluster = ctx.cluster().get();
+
+            T2<UUID, Long> ids = parseGlobalQueryId(id);
+
+            if (ids == null)
+                throw new IllegalArgumentException("Expected global query id. 
" + EXPECTED_GLOBAL_QRY_ID_FORMAT);
+
+            res = cluster.compute().execute(new VisorQueryCancelTask(),
+                new VisorTaskArgument<>(ids.get1(), new 
VisorQueryCancelTaskArg(ids.get1(), ids.get2()), false));
+        }
+        catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+
+        if (!res)
+            throw new RuntimeException("Query not found[id=" + id + ']');
+    }
+
+    /** {@inheritDoc} */
+    @Override public void cancelScan(String originNodeId, String cacheName, 
Long id) {
+        A.notNullOrEmpty(originNodeId, "originNodeId");
+        A.notNullOrEmpty(cacheName, "cacheName");
+        A.notNull(id, "id");
+
+        if (log.isInfoEnabled())
+            log.info("Killing scan query[id=" + id + ",originNodeId=" + 
originNodeId + ']');
+
+        cancelScan(UUID.fromString(originNodeId), cacheName, id);
+    }
+
+    /**
+     * Kills scan query by the identifiers.
+     *
+     * @param originNodeId Originating node id.
+     * @param cacheName Cache name.
+     * @param id Scan query id.
+     */
+    public void cancelScan(UUID originNodeId, String cacheName, long id) {
+        boolean res;
+
+        try {
+            IgniteClusterImpl cluster = ctx.cluster().get();
+
+            ClusterNode srv = U.randomServerNode(ctx);
 
 Review comment:
   We will end up with memory and resources leak. Because the cancel task 
message arrives first and we get  "Query not found" here. But later the start 
task message arrives, the task starts execution but no one will cancel it 
because cancel task will not be resent.
   
   > Then we would get an error "Query not found".
   
   You may use custom communication SPI to delay start task messages and 
reorder them with cancel task messages.
   > Can you, please, clarify, what tests should be added to check the changes?

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