[jira] [Commented] (PHOENIX-2966) Implement mechanism to build async indexes when running locally

["James Taylor (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PHOENIX-2966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15316863#comment-15316863 ] 

James Taylor commented on PHOENIX-2966:
---------------------------------------

The simplest way to do this is to mimic what is done in PHOENIX-2950. There are three parts to this:
- Determine when we're running locally. The simplest way is to check the {{hbase.cluster.distributed}} config parameter. If false, we know we need to use this new mechanism to start async index builds in a different way. We need to make this check on the *server-side* as the client-side config will not have this property.
- Start a scheduled thread which queries the SYSTEM.CATALOG table in the same way as is done in PHOENIX-2950 to determine which indexes need to be built.
- Issue a {{ALTER INDEX <index name> ON <table name> REBUILD}} call on each index that needs to be built.

The best place for this code to live would be MetaDataRegionObserver which is a coprocessor that is only installed on the {{SYSTEM.CATALOG}} table. The existing code in that class is already starting a scheduled task - perhaps this functionality can be folded into the same runnable?

> Implement mechanism to build async indexes when running locally
> ---------------------------------------------------------------
>
>                 Key: PHOENIX-2966
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-2966
>             Project: Phoenix
>          Issue Type: Sub-task
>            Reporter: James Taylor
>             Fix For: 4.8.0
>
>
> For local, non distributed environments, we need to build indexes that were build asynchronously.



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