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From "Lars Hofhansl (Jira)" <j...@apache.org>
Subject [jira] [Updated] (PHOENIX-5494) Batched, mutable Index updates are unnecessarily run one-by-one
Date Mon, 11 Nov 2019 00:15:00 GMT

     [ https://issues.apache.org/jira/browse/PHOENIX-5494?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated PHOENIX-5494:
-----------------------------------
    Attachment: Screenshot_20191110_161453.png

> Batched, mutable Index updates are unnecessarily run one-by-one
> ---------------------------------------------------------------
>
>                 Key: PHOENIX-5494
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-5494
>             Project: Phoenix
>          Issue Type: Improvement
>            Reporter: Lars Hofhansl
>            Priority: Major
>              Labels: performance
>         Attachments: Screenshot_20191110_160243.png, Screenshot_20191110_160351.png,
Screenshot_20191110_161453.png
>
>
> I just noticed that index updates on mutable tables retrieve their deletes (to invalidate
the old index entry) one-by-one.
> For batches, this can be *the* major time spent during an index update. The cost is mostly
incured by the repeated setup (and seeking) of the new region scanner (for each row).
> We can instead do a skip scan and get all updates in a single scan per region.
> (Logically that is simple, but it will require some refactoring)
> I won't be getting to this, but recording it here in case someone feels inclined.



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