nizhikov 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_r394374809
 
 

 ##########
 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:
   > Every node in the cluster can be overloaded, even the one where we are 
going to send the kill task from. 
   > This is not an issue.
   
   This is the issue I'm trying to solve with these changes.
   
   > I think that proposed approach is not bug-free
   
   Can you, please, clarify, what tests should be added to check the changes?
   
   > What would happen if cancel task request arrived before start task 
request? 
   
   Then we would get an error "Query not found".

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