[jira] [Commented] (HBASE-18569) Add prefetch support for async region locator

["Duo Zhang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-18569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16519202#comment-16519202 ] 

Duo Zhang commented on HBASE-18569:
-----------------------------------

OK the prefetch code has already been purged from the sync client in HBASE-10018. And since now we are using the reverse scan to get the region location, I think we can add it back. For random read/write it would help a lot.

For a typical MR this will not help as we will always scan forward, not backward, but since the it could still finish in one rpc call, there is no down side either.

> Add prefetch support for async region locator
> ---------------------------------------------
>
>                 Key: HBASE-18569
>                 URL: https://issues.apache.org/jira/browse/HBASE-18569
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Duo Zhang
>            Priority: Major
>
> It will be useful for large tables.



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