[jira] [Commented] (FLINK-21543) when using FIFO compaction, I found sst being deleted on the first checkpoint

["Yun Tang (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-21543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17435847#comment-17435847 ] 

Yun Tang commented on FLINK-21543:
----------------------------------

Since RocksDB's FIFO compaction would cause data lost quitely, it cannot be used in open-source Flink, I'll close this ticket. 
[~zhoujira86] your special use case is intresting, and mabe you could share more information if still choosing this way.

> when using FIFO compaction, I found sst being deleted on the first checkpoint
> -----------------------------------------------------------------------------
>
>                 Key: FLINK-21543
>                 URL: https://issues.apache.org/jira/browse/FLINK-21543
>             Project: Flink
>          Issue Type: Bug
>          Components: Runtime / State Backends
>            Reporter: xiaogang zhou
>            Priority: Minor
>              Labels: auto-deprioritized-major, stale-minor
>         Attachments: LOG (2), image-2021-03-03-11-35-11-458.png, image-2021-03-03-13-09-01-695.png
>
>
> 2021/03/01-18:51:01.202049 7f59042fc700 (Original Log Time 2021/03/01-18:51:01.200883) [/compaction/compaction_picker_fifo.cc:107] [_timer_state/processing_user-timers] FIFO compaction: picking file 1710 with creation time 0 for deletion
>  
> the configuration is like 
> currentOptions.setCompactionStyle(getCompactionStyle());
>  currentOptions.setLevel0FileNumCompactionTrigger(8);
>  // currentOptions.setMaxTableFilesSizeFIFO(MemorySize.parse("2gb").getBytes());
>  CompactionOptionsFIFO compactionOptionsFIFO = new CompactionOptionsFIFO();
>  compactionOptionsFIFO.setMaxTableFilesSize(MemorySize.parse("8gb").getBytes());
>  compactionOptionsFIFO.setAllowCompaction(true);
>  
> the rocksdb version is 
> <dependency>
>  <groupId>io.github.myasuka</groupId>
>  <artifactId>frocksdbjni</artifactId>
>  <version>6.10.2-ververica-3.0</version>
>  </dependency>
>  
> I think the problem is caused by tableproperty is lost by snapshot. Can any one suggest how i can skip this problem?



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