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https://issues.apache.org/jira/browse/PHOENIX-3811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16006920#comment-16006920
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Matthew Van Wely commented on PHOENIX-3811:
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Thx [~giacomotaylor].  

> If you don't set the REPLAY_AT property and earlier batches are processed 
> before later batches, you run the risk of overwriting a row with an earlier 
> value

Regarding this, we aim to make all upserts idempotents by reloading and writing 
the entire row, as a retry mechanism to avoid overlapping and out of order 
writes.  We'll consider if "replay_at" is still needed.  Thx.

> Do not disable index on write failure by default
> ------------------------------------------------
>
>                 Key: PHOENIX-3811
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-3811
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: James Taylor
>            Assignee: James Taylor
>             Fix For: 4.11.0
>
>         Attachments: PHOENIX-3811_v1.patch, PHOENIX-3811_v2.patch, 
> PHOENIX-3811_v3.patch, PHOENIX-3811-wip1.patch, PHOENIX-3811-wip2.patch, 
> PHOENIX-3811-wip3.patch, PHOENIX-3811-wip4.patch, PHOENIX-3811-wip5.patch, 
> PHOENIX-3811-wip7.patch
>
>
> We should provide a way to configure the system so that the server takes no 
> specific action when an index write fails. Since we always throw the write 
> failure back to the client, the client can often deal with failures more 
> easily than the server since they have the batch of mutations in memory. 
> Often times, allowing access to an index that may be one batch behind the 
> data table is better than disabling it given the negative performance that 
> will occur while the index cannot be written to.



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