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From "Phabricator (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-3603) Enable client-side caching for scans on HBase
Date Wed, 09 Jan 2013 04:00:13 GMT

    [ https://issues.apache.org/jira/browse/HIVE-3603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13547609#comment-13547609
] 

Phabricator commented on HIVE-3603:
-----------------------------------

zhenxiao has commented on the revision "HIVE-3603 [jira] Enable client-side caching for scans
on HBase".

  Very minor comments.

INLINE COMMENTS
  hbase-handler/src/test/queries/positive/hbase_scan_params.q:7 How about:
  select * from hbase_pushdown order by key limit 10;

REVISION DETAIL
  https://reviews.facebook.net/D7761

To: JIRA, navis
Cc: zhenxiao

                
> Enable client-side caching for scans on HBase
> ---------------------------------------------
>
>                 Key: HIVE-3603
>                 URL: https://issues.apache.org/jira/browse/HIVE-3603
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Karthik Ranganathan
>            Assignee: Navis
>            Priority: Minor
>         Attachments: HIVE-3603.D7761.1.patch
>
>
> HBaseHandler sets up a TableInputFormat MR job against HBase to read data in. The underlying
implementation (in HBaseHandler.java) makes an RPC call per row-key, which makes it very inefficient.
Need to specify a client side cache size on the scan.
> Note that HBase currently only supports num-rows based caching (no way to specify a memory
limit). Created HBASE-6770 to address this.

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