SteveYurongSu commented on issue #2124:
URL: https://github.com/apache/iotdb/issues/2124#issuecomment-735351593
I think the bug is introduced by the merge strategy. When I set the
`compaction_strategy` to `NO_COMPACTION`, everything works well.
Here is the code to reproduce the case. (set the `compaction_strategy` to
`LEVEL_COMPACTION`)
```java
/*
* 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
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*/
package org.apache.iotdb;
import java.util.ArrayList;
import java.util.List;
import org.apache.iotdb.rpc.IoTDBConnectionException;
import org.apache.iotdb.rpc.StatementExecutionException;
import org.apache.iotdb.rpc.TSStatusCode;
import org.apache.iotdb.session.Session;
import org.apache.iotdb.session.SessionDataSet;
import org.apache.iotdb.tsfile.file.metadata.enums.CompressionType;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.file.metadata.enums.TSEncoding;
public class SessionExample {
private static Session session;
public static void main(String[] args)
throws IoTDBConnectionException, StatementExecutionException {
session = new Session("127.0.0.1", 6667, "root", "root");
session.open(false);
try {
session.setStorageGroup("root.storagegroup");
} catch (StatementExecutionException e) {
if (e.getStatusCode() !=
TSStatusCode.PATH_ALREADY_EXIST_ERROR.getStatusCode()) {
throw e;
}
}
createTimeseries();
insertRecords();
query();
session.close();
}
private static void createTimeseries()
throws IoTDBConnectionException, StatementExecutionException {
for (int i = 1; i <= 10; ++i) {
String path = "root.storagegroup.city.device";
if (i < 10) {
path += "000";
} else if (i < 100) {
path += "00";
} else if (i < 1000) {
path += "0";
}
path += i;
String comsumption = path + ".comsumption";
if (!session.checkTimeseriesExists(comsumption)) {
session.createTimeseries(comsumption, TSDataType.FLOAT,
TSEncoding.GORILLA,
CompressionType.SNAPPY);
}
System.out.println(comsumption);
String status = path + ".status";
if (!session.checkTimeseriesExists(status)) {
session.createTimeseries(status, TSDataType.FLOAT,
TSEncoding.GORILLA,
CompressionType.SNAPPY);
}
System.out.println(status);
}
}
private static void insertRecords() throws IoTDBConnectionException,
StatementExecutionException {
for (int i = 1; i <= 10; ++i) {
String deviceId = "root.storagegroup.city.device";
if (i < 10) {
deviceId += "000";
} else if (i < 100) {
deviceId += "00";
} else if (i < 1000) {
deviceId += "0";
}
deviceId += i;
List<String> measurements = new ArrayList<>();
measurements.add("comsumption");
measurements.add("status");
List<String> deviceIds = new ArrayList<>();
List<List<String>> measurementsList = new ArrayList<>();
List<List<Object>> valuesList = new ArrayList<>();
List<Long> timestamps = new ArrayList<>();
List<List<TSDataType>> typesList = new ArrayList<>();
for (long time = 1546300800000L; time < 1546300800000L + 900000L *
35040; time += 900000L) {
List<Object> values = new ArrayList<>();
List<TSDataType> types = new ArrayList<>();
values.add(1.3f);
values.add(1.0f);
types.add(TSDataType.FLOAT);
types.add(TSDataType.FLOAT);
deviceIds.add(deviceId);
measurementsList.add(measurements);
timestamps.add(time);
typesList.add(types);
valuesList.add(values);
}
session.insertRecords(deviceIds, timestamps, measurementsList,
typesList, valuesList);
}
}
private static void query() throws IoTDBConnectionException,
StatementExecutionException {
for (int i = 1; i <= 10; ++i) {
String deviceId = "root.storagegroup.city.device";
if (i < 10) {
deviceId += "000";
} else if (i < 100) {
deviceId += "00";
} else if (i < 1000) {
deviceId += "0";
}
deviceId += i;
SessionDataSet dataSet = session.executeQueryStatement(String.format(
"select count(comsumption), count(status) from %s where time >=
1546300800000 and time < 1546560000000",
deviceId));
System.out.println(dataSet.getColumnNames());
while (dataSet.hasNext()) {
System.out.println(dataSet.next());
}
dataSet.closeOperationHandle();
}
}
}
```
The bug is first introduced by the commit `db4318302`.
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