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Posted to notifications@iotdb.apache.org by "Zesong Sun (Jira)" <ji...@apache.org> on 2020/04/21 01:23:00 UTC

[jira] [Assigned] (IOTDB-605) Add more levels of index in TsFileMetadata

     [ https://issues.apache.org/jira/browse/IOTDB-605?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zesong Sun reassigned IOTDB-605:
--------------------------------

    Assignee: Zesong Sun

> Add more levels of index in TsFileMetadata
> ------------------------------------------
>
>                 Key: IOTDB-605
>                 URL: https://issues.apache.org/jira/browse/IOTDB-605
>             Project: Apache IoTDB
>          Issue Type: Improvement
>            Reporter: Zesong Sun
>            Assignee: Zesong Sun
>            Priority: Major
>         Attachments: Examples.png, Structure of MetadataIndex levels.png
>
>
> Facing a scenario that one device has 300k measurements, when we read one time series in a TsFile, we need to deserialize 300k TimeseriesMetadata, which costs about 250ms (just for reading metadata of one tsfile). This may cause the query much slow.
> As this scenario is not rare, I think this should be optimized by adding more indexes in TsFileMetadata.



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