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Posted to dev@phoenix.apache.org by "Lars Hofhansl (Jira)" <ji...@apache.org> on 2019/11/11 00:04:00 UTC
[jira] [Updated] (PHOENIX-5494) Batched, mutable Index updates are
unnecessarily run one-by-one
[ 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_160351.png
Screenshot_20191110_160243.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
>
>
> 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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