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https://issues.apache.org/jira/browse/IOTDB-3329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17557561#comment-17557561
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周沛辰 commented on IOTDB-3329:
----------------------------
There are bugs in cross-space files selection before 0.12.5, such as unseq file
4 is overlap with seq files 1, 2, 3, but since 1 and 3 are being occupied by
other compactions, only 2 and 4 will be selected for cross-space compaction,
which will lead to target files overlapped with other seq files before and
after. Then this file participate in inner-space compaction, which will lead to
various levels of overlap in the final target file. For example, when the seq
files 1, 2, 3 is selected in inner space compaction, while seq file 2 overlap
with 3 due to cross space compaction, then after rewriting by pages in inner
space compaction will lead a overlap between pages in target file. However, the
cross file selection bug was fixed in 0.12.5.
> Fix overlap between pages after compaction of IOTDB before 0.13
> ---------------------------------------------------------------
>
> Key: IOTDB-3329
> URL: https://issues.apache.org/jira/browse/IOTDB-3329
> Project: Apache IoTDB
> Issue Type: Bug
> Affects Versions: 0.12.5
> Reporter: 周沛辰
> Assignee: 周沛辰
> Priority: Major
> Attachments: image-2022-06-23-00-37-13-119.png
>
> Original Estimate: 32h
> Remaining Estimate: 32h
>
> Before v0.13, cross space compaction may result overlap between pages in
> target files.
> For example, the timestamp of first three pages is larger than the rest pages
> in one chunk.
> !image-2022-06-23-00-37-13-119.png|width=2236,height=1397!
>
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