EJTTianyu created IOTDB-1432:
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Summary: level compaction may cause data loss problem
Key: IOTDB-1432
URL: https://issues.apache.org/jira/browse/IOTDB-1432
Project: Apache IoTDB
Issue Type: Bug
Components: Compaction
Reporter: EJTTianyu
Attachments: image-2021-06-11-00-13-38-217.png,
image-2021-06-11-00-15-31-057.png, image-2021-06-11-00-20-59-015.png
The current level compaction of IoTDB does not behave correctly in some cases,
resulting in data loss problems.
The problem can be reproduced as follows:
*configuration*
* version：rel/0.11
* compaction_strategy=LEVEL_COMPACTION
* seq_file_num_in_each_level=2
* seq_level_num=2
*Steps to reproduce*
* Start a new IoTDB instance
* Use the cli tool to execute the following commands
{code:java}
insert into root.sg0.d0(timestamp,s0) values(0,0)
flush
insert into root.sg0.d0(timestamp,s0) values(1,1)
insert into root.sg0.d0(timestamp,s1) values(1,1)
select count(*) from root
flush
select count(*) from root
{code}
The execution screenshot is as follows, we can see that the count of the data
before and after the merge has changed.
!image-2021-06-11-00-20-59-015.png!
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