[jira] [Commented] (PHOENIX-6501) Use batching when joining data table rows with uncovered index rows

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PHOENIX-6501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17499817#comment-17499817 ] 

ASF GitHub Bot commented on PHOENIX-6501:
-----------------------------------------

kadirozde opened a new pull request #1399:
URL: https://github.com/apache/phoenix/pull/1399


   … index rows


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> Use batching when joining data table rows with uncovered index rows
> -------------------------------------------------------------------
>
>                 Key: PHOENIX-6501
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-6501
>             Project: Phoenix
>          Issue Type: Improvement
>    Affects Versions: 5.1.2
>            Reporter: Kadir Ozdemir
>            Assignee: Kadir OZDEMIR
>            Priority: Major
>
> PHOENIX-6458 extends the existing uncovered local index support for global indexes. The current solution uses HBase get operations to join data table rows with uncovered index rows on the server side. Doing a separate RPC call for every data table row can be expensive. Instead, we can buffer lots of data row keys in memory,  use a skip scan filter and even multiple threads to issue a separate scan for each data table region in parallel. This will reduce the cost of join and also improve the performance.



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