[GitHub] [incubator-seatunnel] hailin0 commented on a diff in pull request #2832: [Feature][Connector-V2] add tdengine source

[GitBox <gi...@apache.org>]

hailin0 commented on code in PR #2832:
URL: https://github.com/apache/incubator-seatunnel/pull/2832#discussion_r994224378


##########
seatunnel-connectors-v2/connector-tdengine/src/main/java/org/apache/seatunnel/connectors/seatunnel/tdengine/source/TDengineSourceSplitEnumerator.java:
##########
@@ -0,0 +1,161 @@
+/*
+ * 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.seatunnel.connectors.seatunnel.tdengine.source;
+
+import org.apache.seatunnel.api.source.SourceSplitEnumerator;
+import org.apache.seatunnel.common.config.Common;
+import org.apache.seatunnel.connectors.seatunnel.tdengine.config.TDengineSourceConfig;
+import org.apache.seatunnel.connectors.seatunnel.tdengine.state.TDengineSourceState;
+
+import com.google.common.collect.Sets;
+
+import java.time.Instant;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+public class TDengineSourceSplitEnumerator implements SourceSplitEnumerator<TDengineSourceSplit, TDengineSourceState> {
+
+    private static final DateTimeFormatter FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS");
+    private final SourceSplitEnumerator.Context<TDengineSourceSplit> context;
+    private final TDengineSourceConfig config;
+    private Set<TDengineSourceSplit> pendingSplit = Sets.newConcurrentHashSet();
+    private Set<TDengineSourceSplit> assignedSplit = Sets.newConcurrentHashSet();
+
+    public TDengineSourceSplitEnumerator(TDengineSourceConfig config, SourceSplitEnumerator.Context<TDengineSourceSplit> context) {
+        this.config = config;
+        this.context = context;
+    }
+
+    public TDengineSourceSplitEnumerator(TDengineSourceConfig config, TDengineSourceState sourceState, SourceSplitEnumerator.Context<TDengineSourceSplit> context) {
+        this(config, context);
+        this.assignedSplit = sourceState.getAssignedSplit();
+    }
+
+    private static int getSplitOwner(String tp, int numReaders) {
+        return tp.hashCode() % numReaders;
+    }
+
+    @Override
+    public void open() {
+    }
+
+    @Override
+    public void run() {
+        pendingSplit = getAllSplit();
+        assignSplit(context.registeredReaders());
+    }
+
+    /**
+     * split the time range into numPartitions parts if numPartitions is 1, use the whole time range if numPartitions < (end - start), use (start-end) partitions
+     * <p>
+     * eg: start = 1, end = 10, numPartitions = 2 sql = "select * from test"
+     * <p>
+     * split result
+     * <p>
+     * split 1: select * from test  where (time >= 1 and time < 6)
+     * <p>
+     * split 2: select * from test  where (time >= 6 and time < 11)
+     */
+    private Set<TDengineSourceSplit> getAllSplit() {
+        String sql = "select * from " + config.getStable();
+        Set<TDengineSourceSplit> sourceSplits = Sets.newHashSet();
+        // no need numPartitions, use one partition
+        if (config.getPartitionsNum() <= 1) {
+            sourceSplits.add(new TDengineSourceSplit("0", sql));
+            return sourceSplits;
+        }
+        long start = config.getLowerBound();
+        long end = config.getUpperBound();
+        int partitionsNum = config.getPartitionsNum();
+        if (end - start < partitionsNum) {
+            partitionsNum = (int) (end - start);
+        }
+        int size = (int) (end - start) / partitionsNum;
+        long currentStart = start;
+        int i = 0;
+        while (i < partitionsNum) {
+            //Left closed right away
+            long currentEnd = i == partitionsNum - 1 ? end + 1 : currentStart + size;
+            String query = " where ts >= '" + Instant.ofEpochMilli(currentStart).atZone(ZoneId.systemDefault()).format(FORMATTER) + "' and ts < '" + Instant.ofEpochMilli(currentEnd).atZone(ZoneId.systemDefault()).format(FORMATTER) + "'";
+            String finalSQL = sql + query;
+            sourceSplits.add(new TDengineSourceSplit(String.valueOf(i + System.nanoTime()), finalSQL));
+            i++;
+            currentStart += size;
+        }
+        return sourceSplits;
+    }
+
+    @Override
+    public void addSplitsBack(List<TDengineSourceSplit> splits, int subtaskId) {
+        if (!splits.isEmpty()) {
+            pendingSplit.addAll(splits);
+            assignSplit(Collections.singletonList(subtaskId));
+        }
+    }
+
+    @Override
+    public int currentUnassignedSplitSize() {
+        return pendingSplit.size();
+    }
+
+    @Override
+    public void registerReader(int subtaskId) {
+        if (!pendingSplit.isEmpty()) {
+            assignSplit(Collections.singletonList(subtaskId));
+        }
+    }
+
+    private void assignSplit(Collection<Integer> taskIDList) {

Review Comment:
   yes



-- 
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

To unsubscribe, e-mail: commits-unsubscribe@seatunnel.apache.org

For queries about this service, please contact Infrastructure at:
users@infra.apache.org