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https://issues.apache.org/jira/browse/PHOENIX-3271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15487784#comment-15487784
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Samarth Jain commented on PHOENIX-3271:
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Is this different from the current optimization we have where UPSERT SELECT can
run on server side? Should we just execute UPSERT SELECT on server side in most
cases? If source and target tables are on different region servers, are cross
region server RPCs going to be OK?
> Distribute UPSERT SELECT across cluster
> ---------------------------------------
>
> Key: PHOENIX-3271
> URL: https://issues.apache.org/jira/browse/PHOENIX-3271
> Project: Phoenix
> Issue Type: Improvement
> Reporter: James Taylor
>
> Based on some informal testing we've done, it seems that creation of a local
> index is orders of magnitude faster that creation of global indexes (17
> seconds versus 10-20 minutes - though more data is written in the global
> index case). Under the covers, a global index is created through the running
> of an UPSERT SELECT. Also, UPSERT SELECT provides an easy way of copying a
> table. In both of these cases, the data being upserted must all flow back to
> the same client which can become a bottleneck for a large table. Instead,
> what can be done is to push each separate, chunked UPSERT SELECT call out to
> a different region server for execution there. One way we could implement
> this would be to have an endpoint coprocessor push the chunked UPSERT SELECT
> out to each region server and return the number of rows that were upserted
> back to the client.
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