[IOTDB-1667] Speed up the deletion of database by avoiding flush

[HTHou]

Description

https://issues.apache.org/jira/browse/IOTDB-1667

How to test

Add a UT in DataRegionTest.
Before this PR, syncDeleteDataFiles costs 101ms ~ 1121ms.
After this PR, syncDeleteDataFiles costs about 12ms.

  @Test
  public void testIoTDBTabletWriteAndDeleteDataRegion()
      throws QueryProcessException, IllegalPathException, WriteProcessException,
          TsFileProcessorException {
    String[] measurements = new String[2];
    measurements[0] = "s0";
    measurements[1] = "s1";
    TSDataType[] dataTypes = new TSDataType[2];
    dataTypes[0] = TSDataType.INT32;
    dataTypes[1] = TSDataType.INT64;

    MeasurementSchema[] measurementSchemas = new MeasurementSchema[2];
    measurementSchemas[0] = new MeasurementSchema("s0", TSDataType.INT32, TSEncoding.PLAIN);
    measurementSchemas[1] = new MeasurementSchema("s1", TSDataType.INT64, TSEncoding.PLAIN);

    long[] times = new long[100];
    Object[] columns = new Object[2];
    columns[0] = new int[100];
    columns[1] = new long[100];

    for (int r = 0; r < 100; r++) {
      times[r] = r;
      ((int[]) columns[0])[r] = 1;
      ((long[]) columns[1])[r] = 1;
    }

    InsertTabletNode insertTabletNode1 =
        new InsertTabletNode(
            new QueryId("test_write").genPlanNodeId(),
            new PartialPath("root.vehicle.d0"),
            false,
            measurements,
            dataTypes,
            measurementSchemas,
            times,
            null,
            columns,
            times.length);

    dataRegion.insertTablet(insertTabletNode1);

    for (int r = 50; r < 149; r++) {
      times[r - 50] = r;
      ((int[]) columns[0])[r - 50] = 1;
      ((long[]) columns[1])[r - 50] = 1;
    }

    InsertTabletNode insertTabletNode2 =
        new InsertTabletNode(
            new QueryId("test_write").genPlanNodeId(),
            new PartialPath("root.vehicle.d0"),
            false,
            measurements,
            dataTypes,
            measurementSchemas,
            times,
            null,
            columns,
            times.length);

    dataRegion.insertTablet(insertTabletNode2);
    long start = System.nanoTime();
    dataRegion.syncDeleteDataFiles();
    System.out.println(System.nanoTime() - start);
    Assert.assertEquals(0, SystemInfo.getInstance().getTotalMemTableSize());

    QueryDataSource queryDataSource =
        dataRegion.query(
            Collections.singletonList(new PartialPath(deviceId, measurementId)),
            deviceId,
            context,
            null,
            null);

    Assert.assertEquals(0, queryDataSource.getSeqResources().size());
    Assert.assertEquals(0, queryDataSource.getUnseqResources().size());
  }

[sonarqubecloud]

Quality Gate failed

Failed conditions
0.0% Coverage on New Code (required ≥ 80%)

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 42.93%. Comparing base (85f47e0) to head (4779801).
Report is 3 commits behind head on master.

Files	Patch %	Lines
.../iotdb/db/storageengine/dataregion/DataRegion.java	75.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #12445      +/-   ##
============================================
- Coverage     43.37%   42.93%   -0.45%     
  Complexity       69       69              
============================================
  Files          3102     3102              
  Lines        191553   191660     +107     
  Branches      22806    22835      +29     
============================================
- Hits          83085    82280     -805     
- Misses       108468   109380     +912     

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[OneSizeFitsQuorum]

LGTM