accumulo-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "shweta.agrawal" <>
Subject Re: how to maintain versioning in D4M schema?
Date Thu, 26 Nov 2015 11:41:32 GMT
If I append timestamp on rowid. The id which acts as a node will act as 
a different entity.
How this will be maintained?


On Thursday 26 November 2015 04:50 PM, Dylan Hutchison wrote:
> Hi Shweta,
> You have lots of options.  You could append or prepend a timestamp to 
> the rowid or column qualifier.  When prepending to the rowid, you may 
> want to reverse the timestamp in order to better shard your data (that 
> is, prevent all updates at a particular time from going to a single 
> tablet server), at the expense of not being able to do range queries 
> on time periods.  You could also disable or relax the 
> VersioningIterator.  It depends on what you want to do.
> On Thu, Nov 26, 2015 at 1:26 AM, shweta.agrawal 
> < <>> wrote:
>     Hi,
>     I have my data stored in D4M style. I also want to maintain
>     versions of different value on the basis of time.  As in D4M
>     style  data is only in rowid and colQualifier only.
>     Is there any way to achieve versioning in D4M schema?
>     Thanks
>     Shweta

View raw message