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From "Vincent Poon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-4130) Avoid server retries for mutable indexes
Date Tue, 23 Jan 2018 23:40:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-4130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16336559#comment-16336559
] 

Vincent Poon commented on PHOENIX-4130:
---------------------------------------

[~jamestaylor] Since we are now retrying from the client, is it necessary to set the REPLAY_WRITES
(ignoreNewerMutations) attribute ? (i.e. since the data table write succeeded, but the index
write failed, and we're now retrying the mutation from the client).  We went through some
changes with that flag so wasn't sure if that's still necessary for this scenario

> Avoid server retries for mutable indexes
> ----------------------------------------
>
>                 Key: PHOENIX-4130
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4130
>             Project: Phoenix
>          Issue Type: Improvement
>            Reporter: Lars Hofhansl
>            Assignee: Vincent Poon
>            Priority: Major
>             Fix For: 4.14.0
>
>         Attachments: PHOENIX-4130.v1.master.patch, PHOENIX-4130.v2.master.patch
>
>
> Had some discussions with [~jamestaylor], [~samarthjain], and [~vincentpoon], during
which I suggested that we can possibly eliminate retry loops happening at the server that
cause the handler threads to be stuck potentially for quite a while (at least multiple seconds
to ride over common scenarios like splits).
> Instead we can do the retries at the Phoenix client that.
> So:
> # The index updates are not retried on the server. (retries = 0)
> # A failed index update would set the failed index timestamp but leave the index enabled.
> # Now the handler thread is done, it throws an appropriate exception back to the client.
> # The Phoenix client can now retry. When those retries fail the index is disabled (if
the policy dictates that) and throw the exception back to its caller.
> So no more waiting is needed on the server, handler threads are freed immediately.



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