vvivekiyer commented on code in PR #14300:
URL: https://github.com/apache/pinot/pull/14300#discussion_r1840977593


##########
pinot-plugins/pinot-minion-tasks/pinot-minion-builtin-tasks/src/main/java/org/apache/pinot/plugin/minion/tasks/segmentrefresh/SegmentRefreshTaskGenerator.java:
##########
@@ -0,0 +1,167 @@
+/**
+ * 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.plugin.minion.tasks.segmentrefresh;
+
+import com.google.common.base.Preconditions;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import org.apache.pinot.common.data.Segment;
+import org.apache.pinot.common.metadata.segment.SegmentZKMetadata;
+import org.apache.pinot.controller.helix.core.PinotHelixResourceManager;
+import 
org.apache.pinot.controller.helix.core.minion.generator.BaseTaskGenerator;
+import 
org.apache.pinot.controller.helix.core.minion.generator.TaskGeneratorUtils;
+import org.apache.pinot.core.common.MinionConstants;
+import org.apache.pinot.core.common.MinionConstants.SegmentRefreshTask;
+import org.apache.pinot.core.minion.PinotTaskConfig;
+import org.apache.pinot.spi.annotations.minion.TaskGenerator;
+import org.apache.pinot.spi.config.table.TableConfig;
+import org.apache.pinot.spi.config.table.TableTaskConfig;
+import org.apache.pinot.spi.config.table.TableType;
+import org.apache.pinot.spi.data.Schema;
+import org.apache.zookeeper.data.Stat;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+@TaskGenerator
+public class SegmentRefreshTaskGenerator extends BaseTaskGenerator {
+  private static final Logger LOGGER = 
LoggerFactory.getLogger(SegmentRefreshTaskGenerator.class);
+
+  @Override
+  public String getTaskType() {
+    return MinionConstants.SegmentRefreshTask.TASK_TYPE;
+  }
+
+  @Override
+  public List<PinotTaskConfig> generateTasks(List<TableConfig> tableConfigs) {
+    String taskType = MinionConstants.SegmentRefreshTask.TASK_TYPE;
+    List<PinotTaskConfig> pinotTaskConfigs = new ArrayList<>();
+    int tableNumTasks = 0;
+
+    for (TableConfig tableConfig : tableConfigs) {
+      String tableNameWithType = tableConfig.getTableName();
+      LOGGER.info("Start generating SegmentRefresh tasks for table: {}", 
tableNameWithType);
+
+      // Get the task configs for the table. This is used to restrict the 
maximum number of allowed tasks per table at
+      // any given point.
+      Map<String, String> taskConfigs;
+      TableTaskConfig tableTaskConfig = tableConfig.getTaskConfig();
+      if (tableTaskConfig == null) {
+        LOGGER.warn("Failed to find task config for table: {}", 
tableNameWithType);
+        continue;
+      }
+      taskConfigs = 
tableTaskConfig.getConfigsForTaskType(MinionConstants.SegmentRefreshTask.TASK_TYPE);
+      Preconditions.checkNotNull(taskConfigs, "Task config shouldn't be null 
for Table: %s", tableNameWithType);
+      int tableMaxNumTasks = Integer.MAX_VALUE;
+      String tableMaxNumTasksConfig = 
taskConfigs.get(MinionConstants.TABLE_MAX_NUM_TASKS_KEY);
+      if (tableMaxNumTasksConfig != null) {
+        try {
+          tableMaxNumTasks = Integer.parseInt(tableMaxNumTasksConfig);
+        } catch (Exception e) {
+          tableMaxNumTasks = Integer.MAX_VALUE;
+          LOGGER.warn("MaxNumTasks have been wrongly set for table : {}, and 
task {}", tableNameWithType, taskType);
+        }
+      }
+
+      // Get the running segments for a table.
+      Set<Segment> runningSegments =
+          
TaskGeneratorUtils.getRunningSegments(MinionConstants.SegmentRefreshTask.TASK_TYPE,
 _clusterInfoAccessor);
+
+      // Make a single ZK call to get the segments.
+      List<SegmentZKMetadata> allSegments = 
_clusterInfoAccessor.getSegmentsZKMetadata(tableNameWithType);
+
+      for (SegmentZKMetadata segmentZKMetadata : allSegments) {
+        String segmentName = segmentZKMetadata.getSegmentName();
+
+        // Skip consuming segments.
+        if (tableConfig.getTableType() == TableType.REALTIME && 
!segmentZKMetadata.getStatus().isCompleted()) {
+          continue;
+        }
+
+        // Skip segments for which a task is already running.
+        if (runningSegments.contains(new Segment(tableNameWithType, 
segmentZKMetadata.getSegmentName()))) {
+          continue;
+        }
+
+        // Skip if we have reached the maximum number of permissible tasks per 
iteration.
+        if (tableNumTasks >= tableMaxNumTasks) {
+          break;
+        }
+
+        // Skip if the segment is already up-to-date and doesn't have to be 
refreshed.
+        if (!shouldRefreshSegment(segmentZKMetadata, tableConfig)) {
+          continue;
+        }
+
+        Map<String, String> configs = new 
HashMap<>(getBaseTaskConfigs(tableConfig, List.of(segmentName)));

Review Comment:
   Answered this below.



##########
pinot-plugins/pinot-minion-tasks/pinot-minion-builtin-tasks/src/main/java/org/apache/pinot/plugin/minion/tasks/segmentrefresh/SegmentRefreshTaskGenerator.java:
##########
@@ -0,0 +1,167 @@
+/**
+ * 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.plugin.minion.tasks.segmentrefresh;
+
+import com.google.common.base.Preconditions;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import org.apache.pinot.common.data.Segment;
+import org.apache.pinot.common.metadata.segment.SegmentZKMetadata;
+import org.apache.pinot.controller.helix.core.PinotHelixResourceManager;
+import 
org.apache.pinot.controller.helix.core.minion.generator.BaseTaskGenerator;
+import 
org.apache.pinot.controller.helix.core.minion.generator.TaskGeneratorUtils;
+import org.apache.pinot.core.common.MinionConstants;
+import org.apache.pinot.core.common.MinionConstants.SegmentRefreshTask;
+import org.apache.pinot.core.minion.PinotTaskConfig;
+import org.apache.pinot.spi.annotations.minion.TaskGenerator;
+import org.apache.pinot.spi.config.table.TableConfig;
+import org.apache.pinot.spi.config.table.TableTaskConfig;
+import org.apache.pinot.spi.config.table.TableType;
+import org.apache.pinot.spi.data.Schema;
+import org.apache.zookeeper.data.Stat;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+@TaskGenerator
+public class SegmentRefreshTaskGenerator extends BaseTaskGenerator {
+  private static final Logger LOGGER = 
LoggerFactory.getLogger(SegmentRefreshTaskGenerator.class);
+
+  @Override
+  public String getTaskType() {
+    return MinionConstants.SegmentRefreshTask.TASK_TYPE;
+  }
+
+  @Override
+  public List<PinotTaskConfig> generateTasks(List<TableConfig> tableConfigs) {
+    String taskType = MinionConstants.SegmentRefreshTask.TASK_TYPE;
+    List<PinotTaskConfig> pinotTaskConfigs = new ArrayList<>();
+    int tableNumTasks = 0;
+
+    for (TableConfig tableConfig : tableConfigs) {
+      String tableNameWithType = tableConfig.getTableName();
+      LOGGER.info("Start generating SegmentRefresh tasks for table: {}", 
tableNameWithType);
+
+      // Get the task configs for the table. This is used to restrict the 
maximum number of allowed tasks per table at
+      // any given point.
+      Map<String, String> taskConfigs;
+      TableTaskConfig tableTaskConfig = tableConfig.getTaskConfig();
+      if (tableTaskConfig == null) {
+        LOGGER.warn("Failed to find task config for table: {}", 
tableNameWithType);
+        continue;
+      }
+      taskConfigs = 
tableTaskConfig.getConfigsForTaskType(MinionConstants.SegmentRefreshTask.TASK_TYPE);
+      Preconditions.checkNotNull(taskConfigs, "Task config shouldn't be null 
for Table: %s", tableNameWithType);
+      int tableMaxNumTasks = Integer.MAX_VALUE;
+      String tableMaxNumTasksConfig = 
taskConfigs.get(MinionConstants.TABLE_MAX_NUM_TASKS_KEY);
+      if (tableMaxNumTasksConfig != null) {
+        try {
+          tableMaxNumTasks = Integer.parseInt(tableMaxNumTasksConfig);
+        } catch (Exception e) {
+          tableMaxNumTasks = Integer.MAX_VALUE;
+          LOGGER.warn("MaxNumTasks have been wrongly set for table : {}, and 
task {}", tableNameWithType, taskType);
+        }
+      }
+
+      // Get the running segments for a table.
+      Set<Segment> runningSegments =
+          
TaskGeneratorUtils.getRunningSegments(MinionConstants.SegmentRefreshTask.TASK_TYPE,
 _clusterInfoAccessor);
+
+      // Make a single ZK call to get the segments.
+      List<SegmentZKMetadata> allSegments = 
_clusterInfoAccessor.getSegmentsZKMetadata(tableNameWithType);
+
+      for (SegmentZKMetadata segmentZKMetadata : allSegments) {
+        String segmentName = segmentZKMetadata.getSegmentName();
+
+        // Skip consuming segments.
+        if (tableConfig.getTableType() == TableType.REALTIME && 
!segmentZKMetadata.getStatus().isCompleted()) {
+          continue;
+        }
+
+        // Skip segments for which a task is already running.
+        if (runningSegments.contains(new Segment(tableNameWithType, 
segmentZKMetadata.getSegmentName()))) {
+          continue;
+        }
+
+        // Skip if we have reached the maximum number of permissible tasks per 
iteration.
+        if (tableNumTasks >= tableMaxNumTasks) {
+          break;
+        }
+
+        // Skip if the segment is already up-to-date and doesn't have to be 
refreshed.
+        if (!shouldRefreshSegment(segmentZKMetadata, tableConfig)) {
+          continue;
+        }
+
+        Map<String, String> configs = new 
HashMap<>(getBaseTaskConfigs(tableConfig, List.of(segmentName)));
+        configs.put(MinionConstants.DOWNLOAD_URL_KEY, 
segmentZKMetadata.getDownloadUrl());
+        configs.put(MinionConstants.UPLOAD_URL_KEY, 
_clusterInfoAccessor.getVipUrl() + "/segments");
+        configs.put(MinionConstants.ORIGINAL_SEGMENT_CRC_KEY, 
String.valueOf(segmentZKMetadata.getCrc()));
+        pinotTaskConfigs.add(new PinotTaskConfig(taskType, configs));
+        tableNumTasks++;
+      }
+
+      LOGGER.info("Finished generating {} tasks configs for table: {} " + "for 
task: {}", tableNumTasks,
+          tableNameWithType, taskType);
+    }
+
+    return pinotTaskConfigs;
+  }
+
+  /**
+   * We need not refresh when: There were no tableConfig or schema updates 
after the last time the segment was
+   * refreshed by this task.
+   *
+   * Note that newly created segments after the latest tableConfig/schema 
update will still need to be refreshed. This
+   * is because inverted index created is disabled by default during segment 
generation. This can be added as an
+   * additional check in the future, if required.
+   */
+  private boolean shouldRefreshSegment(SegmentZKMetadata segmentZKMetadata, 
TableConfig tableConfig) {

Review Comment:
   Answered this in another thread below. 



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