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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-4130) Avoid server retries for mutable indexes
Date Sat, 26 Aug 2017 00:54:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-4130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16142508#comment-16142508
] 

Lars Hofhansl commented on PHOENIX-4130:
----------------------------------------

As [~jamestaylor] points out setting the failed index timestamp in #2 above is also a cross-regionserver
call. We should ensure that we do not wait too long on that - but if that fails, we're truly
f*cked, so some wait is appropriate. Perhaps 2 or 3 minutes by default.


> 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
>
> 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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