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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2020/08/25 12:14:23 UTC
[GitHub] [incubator-iotdb] mychaow opened a new pull request #1652: add device time index interface
mychaow opened a new pull request #1652:
URL: https://github.com/apache/incubator-iotdb/pull/1652
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[GitHub] [incubator-iotdb] Alima777 commented on pull request #1652: add device time index interface
Posted by GitBox <gi...@apache.org>.
Alima777 commented on pull request #1652:
URL: https://github.com/apache/incubator-iotdb/pull/1652#issuecomment-681822513
Hi, could you add some description for this pr?
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[GitHub] [incubator-iotdb] mychaow commented on a change in pull request #1652: [IOTDB-698] add device time index interface
Posted by GitBox <gi...@apache.org>.
mychaow commented on a change in pull request #1652:
URL: https://github.com/apache/incubator-iotdb/pull/1652#discussion_r489187411
##########
File path: server/src/main/java/org/apache/iotdb/db/timeIndex/TimeIndexer.java
##########
@@ -0,0 +1,121 @@
+/*
+ * 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.iotdb.db.timeIndex;
+
+import org.apache.iotdb.db.engine.storagegroup.TsFileResource;
+import org.apache.iotdb.db.metadata.PartialPath;
+import org.apache.iotdb.tsfile.read.filter.basic.Filter;
+
+import java.util.List;
+import java.util.Map;
+
+public interface TimeIndexer {
+ /**
+ * init the Indexer when IoTDB start
+ * @return whether success
+ */
+ public boolean init();
+
+ /**
+ * may do some prepared work before operation
+ * @return whether success
+ */
+ public boolean begin();
+
+ /**
+ * may do some resource release after operation
+ * @return whether success
+ */
+ public boolean end();
+
+ /**
+ * add one index record for the path
+ * @param path
+ * @param startTime
+ * @param endTime
+ * @param tsFilePath
+ * @return
+ */
+ public boolean addIndexForPath(PartialPath path, long startTime, long endTime, String tsFilePath);
Review comment:
not really sutiable, just add one index for the path, not the file. We add index for a file by using `public boolean addIndexForPaths(Map<String, Integer> paths, long[] startTimes, long[] endTimes, String tsFilePath);`
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[GitHub] [incubator-iotdb] mychaow commented on a change in pull request #1652: [IOTDB-698] add device time index interface
Posted by GitBox <gi...@apache.org>.
mychaow commented on a change in pull request #1652:
URL: https://github.com/apache/incubator-iotdb/pull/1652#discussion_r489173308
##########
File path: server/src/main/java/org/apache/iotdb/db/timeIndex/TimeIndex.java
##########
@@ -0,0 +1,63 @@
+/*
+ * 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.iotdb.db.timeIndex;
+
+import org.apache.iotdb.db.metadata.PartialPath;
+
+/**
+ * Time Index, like deviceIndexer: [(deviceId, startTime, endTime, TsFilePath)] to accelerate query
+ */
+public class TimeIndex {
Review comment:
not really suitable, it's a universal Index Entry, not only device
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[GitHub] [incubator-iotdb] mychaow commented on a change in pull request #1652: add device time index interface
Posted by GitBox <gi...@apache.org>.
mychaow commented on a change in pull request #1652:
URL: https://github.com/apache/incubator-iotdb/pull/1652#discussion_r484756324
##########
File path: server/src/main/java/org/apache/iotdb/db/timeIndex/IndexerManager.java
##########
@@ -0,0 +1,144 @@
+/*
+ * 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.iotdb.db.timeIndex;
+
+import org.apache.iotdb.db.conf.IoTDBDescriptor;
+import org.apache.iotdb.db.exception.metadata.IllegalPathException;
+import org.apache.iotdb.db.metadata.PartialPath;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+
+public class IndexerManager {
+ private String indexerFilePath;
+ private Map<PartialPath, DeviceTimeIndexer> seqIndexers;
+ private Map<PartialPath, DeviceTimeIndexer> unseqIndexers;
+ private ReentrantReadWriteLock lock;
+ private static final Logger logger = LoggerFactory.getLogger(IndexerManager.class);
+
+ private static class IndexerManagerHolder {
+
+ private IndexerManagerHolder() {
+ // allowed to do nothing
+ }
+
+ private static final IndexerManager INSTANCE = new IndexerManager();
+ }
+
+ public static IndexerManager getInstance() {
+ return IndexerManagerHolder.INSTANCE;
+ }
+
+ private IndexerManager() {
+ indexerFilePath = IoTDBDescriptor.getInstance().getConfig().getSchemaDir()
+ + File.pathSeparator + IndexConstants.IndexerFile;
+ seqIndexers = new ConcurrentHashMap<>();
+ unseqIndexers = new ConcurrentHashMap<>();
+ lock = new ReentrantReadWriteLock();
+ }
+
+ /**
+ * init all indexer
+ * @return whether success
+ */
+ public boolean init() {
+ //TODO
+ // 1. get all storage group from file
+ // 2. init indexer for the storage group
+ return true;
+ }
+
+ public void addSeqIndexer(PartialPath storageGroup, DeviceTimeIndexer deviceTimeIndexer) {
+ lock.writeLock().lock();
+ seqIndexers.put(storageGroup, deviceTimeIndexer);
+ lock.writeLock().unlock();
Review comment:
Got it!
##########
File path: server/src/main/java/org/apache/iotdb/db/conf/IoTDBConfig.java
##########
@@ -645,6 +645,10 @@
// time in nanosecond precision when starting up
private long startUpNanosecond = System.nanoTime();
+ // enable new indexer
+ private boolean enableDeviceIndexer = false;
+ private int deviceIndexerType = 0;
Review comment:
Thank you for you advise!
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[GitHub] [incubator-iotdb] mychaow commented on pull request #1652: [IOTDB-698] add device time index interface
Posted by GitBox <gi...@apache.org>.
mychaow commented on pull request #1652:
URL: https://github.com/apache/incubator-iotdb/pull/1652#issuecomment-693179924
> Hi, please change this interface to FileIndexManager and make the default implementation as DeviceTimeIndexEntry
ok
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[GitHub] [incubator-iotdb] SilverNarcissus commented on a change in pull request #1652: add device time index interface
Posted by GitBox <gi...@apache.org>.
SilverNarcissus commented on a change in pull request #1652:
URL: https://github.com/apache/incubator-iotdb/pull/1652#discussion_r484628449
##########
File path: server/src/main/java/org/apache/iotdb/db/timeIndex/IndexerManager.java
##########
@@ -0,0 +1,144 @@
+/*
+ * 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.iotdb.db.timeIndex;
+
+import org.apache.iotdb.db.conf.IoTDBDescriptor;
+import org.apache.iotdb.db.exception.metadata.IllegalPathException;
+import org.apache.iotdb.db.metadata.PartialPath;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+
+public class IndexerManager {
+ private String indexerFilePath;
+ private Map<PartialPath, DeviceTimeIndexer> seqIndexers;
+ private Map<PartialPath, DeviceTimeIndexer> unseqIndexers;
+ private ReentrantReadWriteLock lock;
+ private static final Logger logger = LoggerFactory.getLogger(IndexerManager.class);
+
+ private static class IndexerManagerHolder {
+
+ private IndexerManagerHolder() {
+ // allowed to do nothing
+ }
+
+ private static final IndexerManager INSTANCE = new IndexerManager();
+ }
+
+ public static IndexerManager getInstance() {
+ return IndexerManagerHolder.INSTANCE;
+ }
+
+ private IndexerManager() {
+ indexerFilePath = IoTDBDescriptor.getInstance().getConfig().getSchemaDir()
+ + File.pathSeparator + IndexConstants.IndexerFile;
+ seqIndexers = new ConcurrentHashMap<>();
+ unseqIndexers = new ConcurrentHashMap<>();
+ lock = new ReentrantReadWriteLock();
+ }
+
+ /**
+ * init all indexer
+ * @return whether success
+ */
+ public boolean init() {
+ //TODO
+ // 1. get all storage group from file
+ // 2. init indexer for the storage group
+ return true;
+ }
+
+ public void addSeqIndexer(PartialPath storageGroup, DeviceTimeIndexer deviceTimeIndexer) {
+ lock.writeLock().lock();
+ seqIndexers.put(storageGroup, deviceTimeIndexer);
+ lock.writeLock().unlock();
Review comment:
unlock should in a finally block
##########
File path: server/src/main/java/org/apache/iotdb/db/timeIndex/IndexerManager.java
##########
@@ -0,0 +1,144 @@
+/*
+ * 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.iotdb.db.timeIndex;
+
+import org.apache.iotdb.db.conf.IoTDBDescriptor;
+import org.apache.iotdb.db.exception.metadata.IllegalPathException;
+import org.apache.iotdb.db.metadata.PartialPath;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+
+public class IndexerManager {
+ private String indexerFilePath;
+ private Map<PartialPath, DeviceTimeIndexer> seqIndexers;
+ private Map<PartialPath, DeviceTimeIndexer> unseqIndexers;
+ private ReentrantReadWriteLock lock;
+ private static final Logger logger = LoggerFactory.getLogger(IndexerManager.class);
+
+ private static class IndexerManagerHolder {
+
+ private IndexerManagerHolder() {
+ // allowed to do nothing
+ }
+
+ private static final IndexerManager INSTANCE = new IndexerManager();
+ }
+
+ public static IndexerManager getInstance() {
+ return IndexerManagerHolder.INSTANCE;
+ }
+
+ private IndexerManager() {
+ indexerFilePath = IoTDBDescriptor.getInstance().getConfig().getSchemaDir()
+ + File.pathSeparator + IndexConstants.IndexerFile;
+ seqIndexers = new ConcurrentHashMap<>();
+ unseqIndexers = new ConcurrentHashMap<>();
+ lock = new ReentrantReadWriteLock();
+ }
+
+ /**
+ * init all indexer
+ * @return whether success
+ */
+ public boolean init() {
+ //TODO
+ // 1. get all storage group from file
+ // 2. init indexer for the storage group
+ return true;
+ }
+
+ public void addSeqIndexer(PartialPath storageGroup, DeviceTimeIndexer deviceTimeIndexer) {
+ lock.writeLock().lock();
+ seqIndexers.put(storageGroup, deviceTimeIndexer);
+ lock.writeLock().unlock();
+ }
+
+ public void addUnseqIndexer(PartialPath storageGroup, DeviceTimeIndexer deviceTimeIndexer) {
+ lock.writeLock().lock();
+ unseqIndexers.put(storageGroup, deviceTimeIndexer);
+ lock.writeLock().unlock();
Review comment:
same as above
##########
File path: server/src/main/java/org/apache/iotdb/db/timeIndex/IndexerManager.java
##########
@@ -0,0 +1,144 @@
+/*
+ * 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.iotdb.db.timeIndex;
+
+import org.apache.iotdb.db.conf.IoTDBDescriptor;
+import org.apache.iotdb.db.exception.metadata.IllegalPathException;
+import org.apache.iotdb.db.metadata.PartialPath;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+
+public class IndexerManager {
+ private String indexerFilePath;
+ private Map<PartialPath, DeviceTimeIndexer> seqIndexers;
+ private Map<PartialPath, DeviceTimeIndexer> unseqIndexers;
+ private ReentrantReadWriteLock lock;
+ private static final Logger logger = LoggerFactory.getLogger(IndexerManager.class);
+
+ private static class IndexerManagerHolder {
+
+ private IndexerManagerHolder() {
+ // allowed to do nothing
+ }
+
+ private static final IndexerManager INSTANCE = new IndexerManager();
+ }
+
+ public static IndexerManager getInstance() {
+ return IndexerManagerHolder.INSTANCE;
+ }
+
+ private IndexerManager() {
+ indexerFilePath = IoTDBDescriptor.getInstance().getConfig().getSchemaDir()
+ + File.pathSeparator + IndexConstants.IndexerFile;
+ seqIndexers = new ConcurrentHashMap<>();
+ unseqIndexers = new ConcurrentHashMap<>();
+ lock = new ReentrantReadWriteLock();
+ }
+
+ /**
+ * init all indexer
+ * @return whether success
+ */
+ public boolean init() {
+ //TODO
+ // 1. get all storage group from file
+ // 2. init indexer for the storage group
+ return true;
+ }
+
+ public void addSeqIndexer(PartialPath storageGroup, DeviceTimeIndexer deviceTimeIndexer) {
+ lock.writeLock().lock();
+ seqIndexers.put(storageGroup, deviceTimeIndexer);
+ lock.writeLock().unlock();
+ }
+
+ public void addUnseqIndexer(PartialPath storageGroup, DeviceTimeIndexer deviceTimeIndexer) {
+ lock.writeLock().lock();
+ unseqIndexers.put(storageGroup, deviceTimeIndexer);
+ lock.writeLock().unlock();
+ }
+
+ public void deleteSeqIndexer(PartialPath storageGroup) {
+ lock.writeLock().lock();
+ seqIndexers.remove(storageGroup);
+ lock.writeLock().unlock();
Review comment:
same as above
##########
File path: server/src/main/java/org/apache/iotdb/db/conf/IoTDBConfig.java
##########
@@ -645,6 +645,10 @@
// time in nanosecond precision when starting up
private long startUpNanosecond = System.nanoTime();
+ // enable new indexer
+ private boolean enableDeviceIndexer = false;
+ private int deviceIndexerType = 0;
Review comment:
I see that you only add these parameter in config but not in iotdb-engine.properties and IoTDBDescriptor.java. So our user can't see you config, please have a look~
##########
File path: server/src/main/java/org/apache/iotdb/db/conf/IoTDBConfig.java
##########
@@ -645,6 +645,10 @@
// time in nanosecond precision when starting up
private long startUpNanosecond = System.nanoTime();
+ // enable new indexer
+ private boolean enableDeviceIndexer = false;
+ private int deviceIndexerType = 0;
Review comment:
At the same time, please don't forget update read me about config change
##########
File path: server/src/main/java/org/apache/iotdb/db/timeIndex/IndexerManager.java
##########
@@ -0,0 +1,144 @@
+/*
+ * 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.iotdb.db.timeIndex;
+
+import org.apache.iotdb.db.conf.IoTDBDescriptor;
+import org.apache.iotdb.db.exception.metadata.IllegalPathException;
+import org.apache.iotdb.db.metadata.PartialPath;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+
+public class IndexerManager {
+ private String indexerFilePath;
+ private Map<PartialPath, DeviceTimeIndexer> seqIndexers;
+ private Map<PartialPath, DeviceTimeIndexer> unseqIndexers;
+ private ReentrantReadWriteLock lock;
+ private static final Logger logger = LoggerFactory.getLogger(IndexerManager.class);
+
+ private static class IndexerManagerHolder {
+
+ private IndexerManagerHolder() {
+ // allowed to do nothing
+ }
+
+ private static final IndexerManager INSTANCE = new IndexerManager();
+ }
+
+ public static IndexerManager getInstance() {
+ return IndexerManagerHolder.INSTANCE;
+ }
+
+ private IndexerManager() {
+ indexerFilePath = IoTDBDescriptor.getInstance().getConfig().getSchemaDir()
+ + File.pathSeparator + IndexConstants.IndexerFile;
+ seqIndexers = new ConcurrentHashMap<>();
+ unseqIndexers = new ConcurrentHashMap<>();
+ lock = new ReentrantReadWriteLock();
+ }
+
+ /**
+ * init all indexer
+ * @return whether success
+ */
+ public boolean init() {
+ //TODO
+ // 1. get all storage group from file
+ // 2. init indexer for the storage group
+ return true;
+ }
+
+ public void addSeqIndexer(PartialPath storageGroup, DeviceTimeIndexer deviceTimeIndexer) {
+ lock.writeLock().lock();
+ seqIndexers.put(storageGroup, deviceTimeIndexer);
+ lock.writeLock().unlock();
+ }
+
+ public void addUnseqIndexer(PartialPath storageGroup, DeviceTimeIndexer deviceTimeIndexer) {
+ lock.writeLock().lock();
+ unseqIndexers.put(storageGroup, deviceTimeIndexer);
+ lock.writeLock().unlock();
+ }
+
+ public void deleteSeqIndexer(PartialPath storageGroup) {
+ lock.writeLock().lock();
+ seqIndexers.remove(storageGroup);
+ lock.writeLock().unlock();
+ }
+
+ public void deleteUnseqIndexer(PartialPath storageGroup) {
+ lock.writeLock().lock();
+ unseqIndexers.remove(storageGroup);
+ lock.writeLock().unlock();
Review comment:
same as above
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[GitHub] [incubator-iotdb] mychaow commented on pull request #1652: add device time index interface
Posted by GitBox <gi...@apache.org>.
mychaow commented on pull request #1652:
URL: https://github.com/apache/incubator-iotdb/pull/1652#issuecomment-681825421
> Hi, could you add some description for this pr?
yes, you could see some description in jira [iotdb-698]( https://issues.apache.org/jira/browse/IOTDB-698?orderby=cf%5B12310310%5D+ASC%2C+priority+DESC%2C+updated+DESC)
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[GitHub] [incubator-iotdb] qiaojialin commented on a change in pull request #1652: [IOTDB-698] add device time index interface
Posted by GitBox <gi...@apache.org>.
qiaojialin commented on a change in pull request #1652:
URL: https://github.com/apache/incubator-iotdb/pull/1652#discussion_r488380495
##########
File path: server/src/assembly/resources/conf/iotdb-engine.properties
##########
@@ -232,6 +232,11 @@ write_read_free_memory_proportion=6:3:1
# primitive array size (length of each array) in array pool
primitive_array_size=128
+# device time indexer
+enable_device_indexer=false
Review comment:
enable_data_file_indexer?
##########
File path: server/src/assembly/resources/conf/iotdb-engine.properties
##########
@@ -232,6 +232,11 @@ write_read_free_memory_proportion=6:3:1
# primitive array size (length of each array) in array pool
primitive_array_size=128
+# device time indexer
+enable_device_indexer=false
+# 0, indexer base on file; 1, indexer base on rocksdb
+device_indexer_type=0
Review comment:
data_file_indexer_manager=internal/rocksdb
##########
File path: server/src/main/java/org/apache/iotdb/db/timeIndex/IndexerManager.java
##########
@@ -0,0 +1,156 @@
+/*
+ * 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.iotdb.db.timeIndex;
+
+import org.apache.iotdb.db.conf.IoTDBDescriptor;
+import org.apache.iotdb.db.exception.metadata.IllegalPathException;
+import org.apache.iotdb.db.metadata.PartialPath;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+
+public class IndexerManager {
Review comment:
```suggestion
public class FileIndexManager {
```
##########
File path: server/src/main/java/org/apache/iotdb/db/timeIndex/TimeIndex.java
##########
@@ -0,0 +1,63 @@
+/*
+ * 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.iotdb.db.timeIndex;
+
+import org.apache.iotdb.db.metadata.PartialPath;
+
+/**
+ * Time Index, like deviceIndexer: [(deviceId, startTime, endTime, TsFilePath)] to accelerate query
+ */
+public class TimeIndex {
Review comment:
DeviceTimeIndexEntry
##########
File path: server/src/main/java/org/apache/iotdb/db/timeIndex/TimeIndexer.java
##########
@@ -0,0 +1,121 @@
+/*
+ * 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.iotdb.db.timeIndex;
+
+import org.apache.iotdb.db.engine.storagegroup.TsFileResource;
+import org.apache.iotdb.db.metadata.PartialPath;
+import org.apache.iotdb.tsfile.read.filter.basic.Filter;
+
+import java.util.List;
+import java.util.Map;
+
+public interface TimeIndexer {
+ /**
+ * init the Indexer when IoTDB start
+ * @return whether success
+ */
+ public boolean init();
+
+ /**
+ * may do some prepared work before operation
+ * @return whether success
+ */
+ public boolean begin();
+
+ /**
+ * may do some resource release after operation
+ * @return whether success
+ */
+ public boolean end();
+
+ /**
+ * add one index record for the path
+ * @param path
+ * @param startTime
+ * @param endTime
+ * @param tsFilePath
+ * @return
+ */
+ public boolean addIndexForPath(PartialPath path, long startTime, long endTime, String tsFilePath);
Review comment:
```suggestion
public boolean addIndexForFile(PartialPath path, long startTime, long endTime, String tsFilePath);
```
##########
File path: server/src/main/java/org/apache/iotdb/db/timeIndex/TimeIndexer.java
##########
@@ -0,0 +1,121 @@
+/*
+ * 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.iotdb.db.timeIndex;
+
+import org.apache.iotdb.db.engine.storagegroup.TsFileResource;
+import org.apache.iotdb.db.metadata.PartialPath;
+import org.apache.iotdb.tsfile.read.filter.basic.Filter;
+
+import java.util.List;
+import java.util.Map;
+
+public interface TimeIndexer {
Review comment:
```suggestion
public interface FileIndexer {
```
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