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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2021/03/10 14:00:17 UTC

[GitHub] [iotdb] zhanglingzhe0820 opened a new pull request #2801: [To 0.11] fix unseq compaction loss data bug after delete operation

zhanglingzhe0820 opened a new pull request #2801:
URL: https://github.com/apache/iotdb/pull/2801


   ## Behavior
   (1) Use the folowing code to write data into 0.11.2:
   (2) delete from root.sg_1
   (3) Then rerun the following code
   (4) select count( * ) from root
   The count is less than 1000000.
   
   ``` java
   static List<Record> mockData(int loop) {
       List<Record> recordList = new ArrayList<>();
       int mockSize=10000;
       long timestamp = mockSize*loop;
       for (int r = 0; r < mockSize; r++) {
           Record record = new Record();
           String storageGroup = "root.sg_1";
           String deviceId = String.format("%s.device_1", storageGroup);
           record.setStorageGroup(storageGroup);
           record.setDeviceId(deviceId);
           record.setTimestamp(new Timestamp(timestamp+r));
           Record.Column column = new Record.Column("pressure", "Float", r%999.0f);
           record.addColumn(column);
           column = new Record.Column("temperature", "Float", r%37.0f);
           record.addColumn(column);
           recordList.add(record);
       }
       return recordList;
   }
   
   public static void main(String[] args) throws IoTDBConnectionException, StatementExecutionException {
   
       IOTDBReader iotdbReader = new IOTDBReader();
       Session session = iotdbReader.openSession();
       for (int loop = 0; loop < 100; loop++) {
           List<Record> recordList = mockData(loop);
           iotdbReader.insertTablet(session, recordList, loop);
           System.out.println(loop);
       }
       session.close();
   }
   ```
   
   ## Reason
   The unseq compaction does not update end time if the end time after unseq compaction is smaller than the end time before.
   This case can be caused by deletion operation as the deleted data will be removed in a compaction.
   
   ## Solution
   1、record all device, startTime, endTime cache and update them each time read in merge process
   2、use putEndTime instead of updateEndTime, use putStartTime instead of updateStartTime


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[GitHub] [iotdb] zhanglingzhe0820 closed pull request #2801: [To 0.11] fix unseq compaction loss data bug after delete operation

Posted by GitBox <gi...@apache.org>.
zhanglingzhe0820 closed pull request #2801:
URL: https://github.com/apache/iotdb/pull/2801


   


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[GitHub] [iotdb] sonarcloud[bot] commented on pull request #2801: [To 0.11] fix unseq compaction loss data bug after delete operation

Posted by GitBox <gi...@apache.org>.
sonarcloud[bot] commented on pull request #2801:
URL: https://github.com/apache/iotdb/pull/2801#issuecomment-799905296


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[GitHub] [iotdb] sonarcloud[bot] commented on pull request #2801: [To 0.11] fix unseq compaction loss data bug after delete operation

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URL: https://github.com/apache/iotdb/pull/2801#issuecomment-796729279


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[GitHub] [iotdb] sonarcloud[bot] removed a comment on pull request #2801: [To 0.11] fix unseq compaction loss data bug after delete operation

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[GitHub] [iotdb] sonarcloud[bot] commented on pull request #2801: [To 0.11] fix unseq compaction loss data bug after delete operation

Posted by GitBox <gi...@apache.org>.
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URL: https://github.com/apache/iotdb/pull/2801#issuecomment-795462100


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[GitHub] [iotdb] jt2594838 commented on a change in pull request #2801: [To 0.11] fix unseq compaction loss data bug after delete operation

Posted by GitBox <gi...@apache.org>.
jt2594838 commented on a change in pull request #2801:
URL: https://github.com/apache/iotdb/pull/2801#discussion_r594799904



##########
File path: server/src/main/java/org/apache/iotdb/db/engine/merge/manage/MergeResource.java
##########
@@ -265,4 +266,27 @@ public void clearChunkWriterCache() {
     this.chunkWriterCache.clear();
   }
 
+  public void updateStartTime(TsFileResource tsFileResource, String device, long startTime) {
+    Map<String, Pair<Long, Long>> deviceStartEndTimePairMap =
+        startEndTimeCache.getOrDefault(tsFileResource, new HashMap<>());
+    Pair<Long, Long> startEndTimePair =
+        deviceStartEndTimePairMap.getOrDefault(device, new Pair<>(Long.MAX_VALUE, Long.MIN_VALUE));
+    long newStartTime = startEndTimePair.left > startTime ? startTime : startEndTimePair.left;
+    deviceStartEndTimePairMap.put(device, new Pair<>(newStartTime, startEndTimePair.right));
+    startEndTimeCache.put(tsFileResource, deviceStartEndTimePairMap);
+  }

Review comment:
       Try using `Map.computeIfAbsent` to avoid redundant  `put` and `new`.




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[GitHub] [iotdb] HTHou merged pull request #2801: [To 0.11] fix unseq compaction loss data bug after delete operation

Posted by GitBox <gi...@apache.org>.
HTHou merged pull request #2801:
URL: https://github.com/apache/iotdb/pull/2801


   


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[GitHub] [iotdb] zhanglingzhe0820 commented on a change in pull request #2801: [To 0.11] fix unseq compaction loss data bug after delete operation

Posted by GitBox <gi...@apache.org>.
zhanglingzhe0820 commented on a change in pull request #2801:
URL: https://github.com/apache/iotdb/pull/2801#discussion_r594802156



##########
File path: server/src/main/java/org/apache/iotdb/db/engine/merge/manage/MergeResource.java
##########
@@ -265,4 +266,27 @@ public void clearChunkWriterCache() {
     this.chunkWriterCache.clear();
   }
 
+  public void updateStartTime(TsFileResource tsFileResource, String device, long startTime) {
+    Map<String, Pair<Long, Long>> deviceStartEndTimePairMap =
+        startEndTimeCache.getOrDefault(tsFileResource, new HashMap<>());
+    Pair<Long, Long> startEndTimePair =
+        deviceStartEndTimePairMap.getOrDefault(device, new Pair<>(Long.MAX_VALUE, Long.MIN_VALUE));
+    long newStartTime = startEndTimePair.left > startTime ? startTime : startEndTimePair.left;
+    deviceStartEndTimePairMap.put(device, new Pair<>(newStartTime, startEndTimePair.right));
+    startEndTimeCache.put(tsFileResource, deviceStartEndTimePairMap);
+  }

Review comment:
       okay




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[GitHub] [iotdb] sonarcloud[bot] commented on pull request #2801: [To 0.11] fix unseq compaction loss data bug after delete operation

Posted by GitBox <gi...@apache.org>.
sonarcloud[bot] commented on pull request #2801:
URL: https://github.com/apache/iotdb/pull/2801#issuecomment-799044361


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[GitHub] [iotdb] sonarcloud[bot] removed a comment on pull request #2801: [To 0.11] fix unseq compaction loss data bug after delete operation

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[GitHub] [iotdb] sonarcloud[bot] removed a comment on pull request #2801: [To 0.11] fix unseq compaction loss data bug after delete operation

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