Add distributor which schedule task to be fairly

fe/src/main/java/org/apache/doris/catalog/Catalog.java

@@ -135,7 +135,7 @@
 import org.apache.doris.load.LoadErrorHub;
 import org.apache.doris.load.LoadJob;
 import org.apache.doris.load.LoadJob.JobState;
-import org.apache.doris.load.routineload.RoutineLoad;
+import org.apache.doris.load.routineload.RoutineLoadManager;
 import org.apache.doris.master.Checkpoint;
 import org.apache.doris.master.MetaHelper;
 import org.apache.doris.metric.MetricRepo;
@@ -241,7 +241,7 @@ public class Catalog {
     private ConcurrentHashMap<String, Cluster> nameToCluster;
 
     private Load load;
-    private RoutineLoad routineLoad;
+    private RoutineLoadManager routineLoadManager;
     private ExportMgr exportMgr;
     private Clone clone;
     private Alter alter;
@@ -372,7 +372,7 @@ private Catalog() {
         this.idToDb = new ConcurrentHashMap<>();
         this.fullNameToDb = new ConcurrentHashMap<>();
         this.load = new Load();
-        this.routineLoad = new RoutineLoad();
+        this.routineLoadManager = new RoutineLoadManager();
         this.exportMgr = new ExportMgr();
         this.clone = new Clone();
         this.alter = new Alter();
@@ -4250,8 +4250,8 @@ public Load getLoadInstance() {
         return this.load;
     }
 
-    public RoutineLoad getRoutineLoadInstance() {
-        return routineLoad;
+    public RoutineLoadManager getRoutineLoadInstance() {
+        return routineLoadManager;
     }
 
     public ExportMgr getExportMgr() {

fe/src/main/java/org/apache/doris/load/routineload/KafkaRoutineLoadProgress.java → fe/src/main/java/org/apache/doris/load/routineload/KafkaProgress.java

@@ -17,8 +17,21 @@
 
 package org.apache.doris.load.routineload;
 
-public class KafkaRoutineLoadProgress {
+import java.util.Map;
 
-    private String partitionName;
-    private long offset;
+/**
+ * this is description of kafka routine load progress
+ * the data before offset was already loaded in doris
+ */
+public class KafkaProgress {
+
+    private Map<Integer, Long> partitionIdToOffset;
+
+    public Map<Integer, Long> getPartitionIdToOffset() {
+        return partitionIdToOffset;
+    }
+
+    public void setPartitionIdToOffset(Map<Integer, Long> partitionIdToOffset) {
+        this.partitionIdToOffset = partitionIdToOffset;
+    }
 }

fe/src/main/java/org/apache/doris/load/routineload/KafkaRoutineLoadJob.java

@@ -18,13 +18,13 @@
 package org.apache.doris.load.routineload;
 
 import com.google.common.base.Strings;
+import com.google.gson.Gson;
 import org.apache.doris.catalog.Catalog;
 import org.apache.doris.catalog.Database;
 import org.apache.doris.common.MetaNotFoundException;
 import org.apache.doris.common.SystemIdGenerator;
 import org.apache.doris.system.SystemInfoService;
 import org.apache.doris.thrift.TResourceInfo;
-import org.apache.doris.thrift.TTaskType;
 import org.apache.kafka.clients.consumer.KafkaConsumer;
 import org.apache.kafka.common.PartitionInfo;
 import org.apache.logging.log4j.LogManager;
@@ -34,6 +34,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Properties;
+import java.util.UUID;
 
 public class KafkaRoutineLoadJob extends RoutineLoadJob {
     private static final Logger LOG = LogManager.getLogger(KafkaRoutineLoadJob.class);
@@ -43,13 +44,13 @@ public class KafkaRoutineLoadJob extends RoutineLoadJob {
 
     private String serverAddress;
     private String topic;
-    // optional
+    // optional, user want to load partitions.
     private List<Integer> kafkaPartitions;
 
     public KafkaRoutineLoadJob() {
     }
 
-    public KafkaRoutineLoadJob(long id, String name, String userName, long dbId, long tableId,
+    public KafkaRoutineLoadJob(String id, String name, String userName, long dbId, long tableId,
                                String partitions, String columns, String where, String columnSeparator,
                                int desireTaskConcurrentNum, JobState state, DataSourceType dataSourceType,
                                int maxErrorNum, TResourceInfo resourceInfo, String serverAddress, String topic) {
@@ -59,21 +60,34 @@ public KafkaRoutineLoadJob(long id, String name, String userName, long dbId, lon
         this.topic = topic;
     }
 
+    public KafkaProgress getProgress() {
+        Gson gson = new Gson();
+        return gson.fromJson(this.progress, KafkaProgress.class);
+    }
+
     @Override
-    public List<RoutineLoadTask> divideRoutineLoadJob(int currentConcurrentTaskNum) {
-        // divide kafkaPartitions into tasks
-        List<KafkaRoutineLoadTask> kafkaRoutineLoadTaskList = new ArrayList<>();
-        for (int i = 0; i < currentConcurrentTaskNum; i++) {
-            // TODO(ml): init load task
-            kafkaRoutineLoadTaskList.add(new KafkaRoutineLoadTask(getResourceInfo(), 0L, TTaskType.PUSH,
-                    dbId, tableId, 0L, 0L, 0L, SystemIdGenerator.getNextId()));
-        }
-        for (int i = 0; i < kafkaPartitions.size(); i++) {
-            kafkaRoutineLoadTaskList.get(i % currentConcurrentTaskNum).addKafkaPartition(kafkaPartitions.get(i));
+    public void divideRoutineLoadJob(int currentConcurrentTaskNum) {
+        writeLock();
+        try {
+            if (state == JobState.NEED_SCHEDULER) {
+                // divide kafkaPartitions into tasks
+                for (int i = 0; i < currentConcurrentTaskNum; i++) {
+                    KafkaTaskInfo kafkaTaskInfo = new KafkaTaskInfo(UUID.randomUUID().toString(), id);
+                    routineLoadTaskInfoList.add(kafkaTaskInfo);
+                    needSchedulerTaskInfoList.add(kafkaTaskInfo);
+                }
+                for (int i = 0; i < kafkaPartitions.size(); i++) {
+                    ((KafkaTaskInfo) routineLoadTaskInfoList.get(i % currentConcurrentTaskNum))
+                            .addKafkaPartition(kafkaPartitions.get(i));
+                }
+                // change job state to running
+                state = JobState.RUNNING;
+            } else {
+                LOG.debug("Ignore to divide routine load job while job state {}", state);
+            }
+        } finally {
+            writeUnlock();
         }
-        List<RoutineLoadTask> result = new ArrayList<>();
-        result.addAll(kafkaRoutineLoadTaskList);
-        return result;
     }
 
     @Override
@@ -99,6 +113,15 @@ public int calculateCurrentConcurrentTaskNum() throws MetaNotFoundException {
         return Math.min(partitionNum, Math.min(desireTaskConcurrentNum, aliveBeNum));
     }
 
+    @Override
+    public RoutineLoadTask createTask(RoutineLoadTaskInfo routineLoadTaskInfo, long beId) {
+        return new KafkaRoutineLoadTask(getResourceInfo(),
+                beId, getDbId(), getTableId(),
+                0L, 0L, 0L, getColumns(), getWhere(), getColumnSeparator(),
+                (KafkaTaskInfo) routineLoadTaskInfo,
+                getProgress());
+    }
+
     private void updatePartitions() {
         // fetch all of kafkaPartitions in topic
         if (kafkaPartitions == null || kafkaPartitions.size() == 0) {

fe/src/main/java/org/apache/doris/load/routineload/KafkaRoutineLoadTask.java

@@ -17,27 +17,29 @@
 
 package org.apache.doris.load.routineload;
 
-import com.google.common.collect.Lists;
 import org.apache.doris.thrift.TResourceInfo;
 import org.apache.doris.thrift.TTaskType;
 
-import java.util.List;
+import java.util.HashMap;
+import java.util.Map;
 
-public class KafkaRoutineLoadTask extends RoutineLoadTask {
-
-    private List<Integer> kafkaPartitions;
 
-    public KafkaRoutineLoadTask(TResourceInfo resourceInfo, long backendId, TTaskType taskType,
-                                long dbId, long tableId, long partitionId, long indexId, long tabletId, long signature) {
-        super(resourceInfo, backendId, taskType, dbId, tableId, partitionId, indexId, tabletId, signature);
-        this.kafkaPartitions = Lists.newArrayList();
-    }
+public class KafkaRoutineLoadTask extends RoutineLoadTask {
 
-    public void addKafkaPartition(int partition) {
-        kafkaPartitions.add(partition);
+    private Map<Integer, Long> partitionIdToOffset;
+
+    public KafkaRoutineLoadTask(TResourceInfo resourceInfo, long backendId,
+                                long dbId, long tableId, long partitionId, long indexId, long tabletId,
+                                String columns, String where, String columnSeparator,
+                                KafkaTaskInfo kafkaTaskInfo, KafkaProgress kafkaProgress) {
+        super(resourceInfo, backendId, TTaskType.STREAM_LOAD, dbId, tableId, partitionId, indexId, tabletId,
+                kafkaTaskInfo.getId(), columns, where, columnSeparator, RoutineLoadJob.DataSourceType.KAFKA);
+        this.partitionIdToOffset = new HashMap<>();
+        kafkaTaskInfo.getPartitions().parallelStream().forEach(entity ->
+                partitionIdToOffset.put(entity, kafkaProgress.getPartitionIdToOffset().get(entity)));
     }
 
-    public List<Integer> getKafkaPartitions() {
-        return kafkaPartitions;
+    public Map<Integer, Long> getPartitionIdToOffset() {
+        return partitionIdToOffset;
     }
 }

fe/src/main/java/org/apache/doris/load/routineload/KafkaTaskInfo.java

@@ -0,0 +1,49 @@
+// 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.doris.load.routineload;
+
+import org.apache.doris.common.SystemIdGenerator;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+public class KafkaTaskInfo extends RoutineLoadTaskInfo {
+
+    private List<Integer> partitions;
+
+    public KafkaTaskInfo(String id, String jobId) {
+        super(id, jobId);
+        this.partitions = new ArrayList<>();
+    }
+
+    public KafkaTaskInfo(KafkaTaskInfo kafkaTaskInfo) {
+        super(UUID.randomUUID().toString(), kafkaTaskInfo.getJobId());
+        this.partitions = kafkaTaskInfo.getPartitions();
+    }
+
+    public void addKafkaPartition(int partition) {
+        partitions.add(partition);
+    }
+
+    public List<Integer> getPartitions() {
+        return partitions;
+    }
+
+
+}