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From "Geoffrey Jacoby (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-4703) Provide an option to fully rebuild indexes asynchronously through SQL
Date Fri, 03 May 2019 20:55:00 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-4703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16832822#comment-16832822
] 

Geoffrey Jacoby commented on PHOENIX-4703:
------------------------------------------

[~giskender] - I +1'ed on the PR, but you could please submit a patch for the test run? Also,
please check to make sure your patch works with the 4.x branches and if not please submit
a backport. Thanks!

> Provide an option to fully rebuild indexes asynchronously through SQL
> ---------------------------------------------------------------------
>
>                 Key: PHOENIX-4703
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4703
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: Vincent Poon
>            Assignee: Gokcen Iskender
>            Priority: Major
>          Time Spent: 4h 50m
>  Remaining Estimate: 0h
>
> Currently if we run "ALTER INDEX ... REBUILD" , all the rows in the index are deleted
and the index is rebuilt synchronously.
> "ALTER INEX ... REBUILD ASYNC" seems to be used for the IndexTool's partial rebuild option,
rebuilding from ASYNC_REBUILD_TIMESTAMP (PHOENIX-2890)
> So it seems currently the only way to fully rebuild is the drop the index, and recreate
it.  This is burdensome as it requires have the schema DDL.
> We should have an option to fully rebuild asynchronously, that has the same semantics
as dropping and recreating the index.  A further advantage of this is we can maintain the
splits of the index table while dropping its data.  We are currently seeing issues where
rebuilding a large table via a MR job results in hotspotting due to all data regions writing
to the same index region at the start.
>  



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