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Posted to notifications@iotdb.apache.org by "Zesong Sun (Jira)" <ji...@apache.org> on 2021/10/26 15:29:00 UTC
[jira] [Commented] (IOTDB-1831) Experiment of the necessity of
TimeseriesMetadata
[ https://issues.apache.org/jira/browse/IOTDB-1831?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17434423#comment-17434423 ]
Zesong Sun commented on IOTDB-1831:
-----------------------------------
According to [experiment results|https://cwiki.apache.org/confluence/display/IOTDB/Experiments+of+TsFile+index+area], the speed of aggregation query slows down a lot without TimeseriesMetadata.
Therefore, TimeseriesMetadata should be reserved.
!image-2021-10-26-23-28-08-120.png|width=577,height=256!
> Experiment of the necessity of TimeseriesMetadata
> -------------------------------------------------
>
> Key: IOTDB-1831
> URL: https://issues.apache.org/jira/browse/IOTDB-1831
> Project: Apache IoTDB
> Issue Type: Task
> Reporter: Jialin Qiao
> Assignee: Zesong Sun
> Priority: Minor
> Attachments: image-2021-10-26-23-28-08-120.png
>
> Original Estimate: 16h
> Remaining Estimate: 16h
>
> After we store TimeseriesMetadata together with ChunkMetadata, the necessity of TimeseriesMetadata needs to be reconsidered. We need some experiments for decision.
> TimeseriesMetadata for Aggregation query and raw data query under different circumstances
>
> (1) for one timeseries how many chunks in one tsfile.
>
>
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