[jira] [Resolved] (PHOENIX-2707) Differentiate between a table+family have zero guideposts from not having collected guideposts

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

     [ https://issues.apache.org/jira/browse/PHOENIX-2707?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

James Taylor resolved PHOENIX-2707.
-----------------------------------
    Resolution: Fixed
      Assignee: James Taylor

> Differentiate between a table+family have zero guideposts from not having collected guideposts
> ----------------------------------------------------------------------------------------------
>
>                 Key: PHOENIX-2707
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-2707
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: James Taylor
>            Assignee: James Taylor
>         Attachments: PHOENIX-2707.patch, PHOENIX-2707_addendum.patch, PHOENIX-2707_v2.patch, PHOENIX-2707_v3.patch
>
>
> In order to accurately track the rows and bytes being scanned, we need to be able to differentiate between a table+family have zero guideposts from not having collected guideposts. See PHOENIX-2706 which attempted to do the same, but in a limited/broken way.
> This new approach will do the following instead:
> - in DefaultStatisticsCollector.writeStatsToStatsTable(), if there are no stats to write, write a row with the physicalTable+columnFamily for the row key and a byteCount and rowCount of zero (in addition to what's being done now).
> - otherwise, always write a Delete for the physicalTable+columnFamily row. In this way, only if all regions of a given column family have no guideposts, will this row remain.
> - in StatisticsWriter.deleteStats(), always write a Delete marker for the physicalTable+columnFamily row.
> - in BaseResultIterators.getParallelScans(), set the areStatsEnabled to true or false based on gps==GuidePostsInfo.EMPTY_GUIDEPOST. In the case of having no rows, the getGuidePosts() method would return a different GuidePostsInfo (that indicates there are no rows). 



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