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HBase, mail # user - Looking for a single row - HTable.get(Get) or Scan(Get)


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Re: Looking for a single row - HTable.get(Get) or Scan(Get)
Doug Meil 2012-05-09, 21:29

Also, there is multi-Get support as of 0.90.x to further optimize the RPC
calls if you need to make a bunch of calls.

On 5/9/12 4:47 PM, "Jean-Daniel Cryans" <[EMAIL PROTECTED]> wrote:

>What Bryan said, also Scan(Get) is used internally in the region
>server code so that's probably why that constructor exists.
>
>But as a user you need to create the scanner, do next() then close it
>so using a straight Get saves 2 rpc.
>
>J-D
>
>On Wed, May 9, 2012 at 1:43 PM, Bryan Beaudreault
><[EMAIL PROTECTED]> wrote:
>> Gets just boil down to single-row Scans.  I believe the only reason to
>>do
>> Scan s = new Scan(Get) would be if you need to add extra options onto
>>the
>> get.  Get's API is more simplified than Scan's.
>>
>> On Wed, May 9, 2012 at 4:19 PM, Kevin <[EMAIL PROTECTED]> wrote:
>>
>>> Hi,
>>>
>>> From what I can tell, there are two ways of scanning a table in HBase.
>>>I'm
>>> hoping to learn a bit by asking is the most efficient way to grab a
>>>single
>>> row from an HTable?
>>>
>>> One can ask the HTable directly by creating a Get object, or one can
>>>create
>>> a Scan object with a Get object and pass it along to the HTable.
>>>
>>> Maybe it doesn't matter. By looking at the source code I couldn't see
>>>how
>>> any one way might be faster/better than another.
>>>
>>> Thanks.
>>>
>