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From "Ankit Singhal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-3271) Distribute UPSERT SELECT across cluster
Date Fri, 27 Jan 2017 15:26:24 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-3271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15842997#comment-15842997
] 

Ankit Singhal commented on PHOENIX-3271:
----------------------------------------

Thanks [~enis] for looking into this.
bq. Rajeshbabu Chintaguntla has a patch which changes the RPC scheduler to be configured programmatically
from the server side, related to PHOENIX-3360. Do we need that patch in before this?
I think yes because now it is easy to get in deadlock if our RPC scheduler is not present.
So, loading it automatically on region server(using [~chrajeshbabu32@gmail.com] short term
fix as per [~devaraj] [comment|https://issues.apache.org/jira/browse/PHOENIX-3360?focusedCommentId=15553907&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15553907]
)  instead of depending on the user to explicitly set the configuration would be better. [~chrajeshbabu32@gmail.com],
can you push the same as part of new JIRA if PHOENIX-3360 needs to be kept open for long term
fix.

bq. One other thing is that these scan RPCs will take a longer time and will timeout, and
retried from the client, causing the worst case behaviour to be pretty bad user experience.
Do we have any plans for dealing with that?
As [~giacomotaylor] said, we should not expect the RPC timeout after [~samarth.jain@gmail.com]
implementation(PHOENIX-2357).

can I push this patch now if no further comments are there. [~giacomotaylor]/[~enis]?

Post this, I'll take up the long-term fixes in Scheduler suggested by [~enis] as a part of
another JIRA.







> 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
>            Assignee: Ankit Singhal
>             Fix For: 4.10.0
>
>         Attachments: PHOENIX-3271.patch, PHOENIX-3271_v1.patch, PHOENIX-3271_v2.patch,
PHOENIX-3271_v3.patch, PHOENIX-3271_v4.patch, PHOENIX-3271_v5.patch
>
>
> 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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