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https://issues.apache.org/jira/browse/PHOENIX-6878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17709769#comment-17709769
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Sai Nukavarapu commented on PHOENIX-6878:
-----------------------------------------

[~richardantal]  -  We have observed 
"org.apache.phoenix.coprocessor.MetaDataEndpointImpl.getTable" calls from 
client jstacks so the client doing a meta-validation for every upsert. The 
performance issue will be present only when  phoenix.acls.enabled=true. Can you 
verify if you have enabled Phoenix ACLs? 

> Upserts into tables with ROW_TIMESTAMP are extremely slow
> ---------------------------------------------------------
>
>                 Key: PHOENIX-6878
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-6878
>             Project: Phoenix
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 5.2.0, 5.1.3
>            Reporter: Istvan Toth
>            Priority: Minor
>
> PHOENIX-4187 changed upserts into tables with ROW_TIMESTAMP fields to always 
> refresh the table cache before executing the mutation.
> This kills non batched write performance for such tables, as the Table 
> metadata is re-read for every row.



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