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From lars hofhansl <la...@apache.org>
Subject Re: HBase atomic append functionality (not just client)
Date Wed, 16 Apr 2014 06:22:26 GMT
It would.



________________________________
 From: Sergey Shelukhin <sergey@hortonworks.com>
To: dev@hbase.apache.org 
Cc: "user@hbase.apache.org" <user@hbase.apache.org> 
Sent: Tuesday, April 15, 2014 11:13 AM
Subject: Re: HBase atomic append functionality (not just client)
 

Hmm... Wouldn't mvcc prevent seeing partial append?
Append is just put in the end, the way it is currently implemented.



On Mon, Apr 14, 2014 at 10:41 AM, Vladimir Rodionov <vrodionov@carrieriq.com
> wrote:

> From HRegion.java:
>
> "Appends performed are done under row lock but reads do not take locks out
> so this can be seen partially complete by gets and scans."
>
> Appends are partially atomic (you can get partial reads but you will never
> get corrupted writes) and they are implemented on the server side.
>
> Best regards,
> Vladimir Rodionov
> Principal Platform Engineer
> Carrier IQ, www.carrieriq.com
> e-mail: vrodionov@carrieriq.com
>
> ________________________________________
> From: GSK Chaitanya [gskchaitanya12@gmail.com]
> Sent: Monday, April 14, 2014 10:05 AM
> To: user@hbase.apache.org; dev@hbase.apache.org
> Subject: HBase atomic append functionality (not just client)
>
> Mighty Hbase users and developers,
>
> I have few questions and I'd really appreciate it if someone can clarify
> them.
>
> 1) I want to know if Hbase inherently supports *atomic
> append*functionality like
> *get* and *put*. For my work, I would be using OpenTSDB which is a layer on
> top of AsynchHBase and AsynchHBase doesnt work with HBase client (which
> supports *atomic append*).
>
> 2) If I understand correctly, atomic append of HBase client internally does
> a get and put instead of actually appending to the end of the cell. If
> that's the case, I wonder how does this functionality is of much use in
> terms of performance. In our case, we would like a very light weight append
> functionality. I'd like to know if there are any plans of adding this
> feature to HBase main in the near future.
>
> Thanks,
> Chaitanya
>
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