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Posted to issues@hbase.apache.org by "Duo Zhang (JIRA)" <ji...@apache.org> on 2018/12/31 12:45:00 UTC

[jira] [Commented] (HBASE-21663) Add replica scan support

    [ https://issues.apache.org/jira/browse/HBASE-21663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16731310#comment-16731310 ] 

Duo Zhang commented on HBASE-21663:
-----------------------------------

The difference between scan and get is that, scan has state, where we will do open, next and close, it is not just send multiple requests which are all same to different servers. The old ScannerCallableWithReplicas is really complicated, we need to think more on how to make it easier to understand.

Maybe the first step is to do a timeline request when opening a region scanner, and once we have selected which replica to use, then we will use it until we finish scanning this region.

> Add replica scan support
> ------------------------
>
>                 Key: HBASE-21663
>                 URL: https://issues.apache.org/jira/browse/HBASE-21663
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Duo Zhang
>            Priority: Major
>




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