[jira] [Closed] (KYLIN-4983) The stream cube will be paused when user append a batch segment first

["Yaqian Zhang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KYLIN-4983?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yaqian Zhang closed KYLIN-4983.
-------------------------------

Resolved in release 3.1.3 (2022-01-06)

> The stream cube will be paused when user append a batch segment first
> ---------------------------------------------------------------------
>
>                 Key: KYLIN-4983
>                 URL: https://issues.apache.org/jira/browse/KYLIN-4983
>             Project: Kylin
>          Issue Type: Bug
>          Components: Real-time Streaming
>            Reporter: Kun Liu
>            Assignee: Kun Liu
>            Priority: Blocker
>             Fix For: v3.1.3
>
>
> Env:
> stream cube (stream_cube) with lambda, and the window of cube is 1hour
> Before enable the stream_cube, we submit a build restful request with the range [2025-01-01,2025-01-02]
>  
> Then enable the stream_cube,  the receiver node will consume data and create segment in real time, but the start time of the new segment is must be less than `2025-01-01`.
>  
> When the receiver node upload the data of the segment to the HDFS and notify the coordinator, and the coordinator will delete the metadata of the stream segment like below code, but the segment of data can't be delete in the receiver node.
>  
> ```
> // If we have a exist historical segment, we should not let new realtime segment overwrite it, it is so dangrous,
> // we just delete the entry to ignore the segment which should not exist
> if (segmentRange.getFirst() < minSegmentStart) {
>  logger.warn(
>  "The cube segment state is not correct because it belongs to historical part, cube:{} segment:{}, clear it.",
>  cubeName, segmentState.getSegmentName());
>  coordinator.getStreamMetadataStore().removeSegmentBuildState(cubeName, segmentState.getSegmentName());
>  continue;
> }
> ```
> The number of immutable segment will reach to 100.
>  
> There are two way to resolve this issue:
>  
>  # forbid appending segment in stream with lambda for the restful api
>  # delete local data and remote hdfs data before remove metadata
> Now i think it is a better way to forbid appending segment in lambda stream cube.
>  
>  
>  



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