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From "Swarnim Kulkarni (JIRA)" <>
Subject [jira] [Commented] (HIVE-3603) Enable client-side caching for scans on HBase
Date Mon, 26 Aug 2013 18:29:56 GMT


Swarnim Kulkarni commented on HIVE-3603:

[~appodictic] Thanks! Also how is setting this property different than directly setting the
"hbase.client.scanner.caching" property in hive-site.xml without this enhancement? Wouldn't
they have the same effect?
> Enable client-side caching for scans on HBase
> ---------------------------------------------
>                 Key: HIVE-3603
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: HBase Handler
>            Reporter: Karthik Ranganathan
>            Assignee: Navis
>            Priority: Minor
>             Fix For: 0.12.0
>         Attachments: HIVE-3603.D7761.1.patch
> HBaseHandler sets up a TableInputFormat MR job against HBase to read data in. The underlying
implementation (in 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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