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From yonghu <yongyong...@gmail.com>
Subject Re: How to understand the TS of each data version?
Date Fri, 27 Sep 2013 15:57:34 GMT
(1,3,5) are timestamp.

regards!

Yong


On Fri, Sep 27, 2013 at 4:47 PM, Ted Yu <yuzhihong@gmail.com> wrote:

> In {10K:1, 20K:3, 15K:5}, what does the value (1, 3, 5) represent ?
>
> Cheers
>
>
> On Fri, Sep 27, 2013 at 7:24 AM, yonghu <yongyong313@gmail.com> wrote:
>
> > Hello,
> >
> > In my understanding, the timestamp of each data version is generated by
> Put
> > command. The value of TS is either indicated by user or assigned by HBase
> > itself. If the TS is generated by HBase, it only records when (the time
> > point) that data version is generated (Have no meaning to the
> application).
> > However, if TS is indicated by user, it may have a specific meaning to
> > applications. The reason why I want to ask this question is: How can I
> > correctly understand the meaning of following data? Suppose I have a
> table
> > which is used to record the internet speed of different suppliers for
> > specific users.
> > For example,
> >
> > rk       Network:Supplier   Network:speed
> >
> > Tom   {d:1, c:4}                 {10K:1, 20K:3, 15K:5}
> >
> > Then I can have following different data information representations:
> >
> > 1. Supplier d have speeds 10K and 20K. Supplier c have 15K.
> > 2. Supplier d have speeds 10K, 20K and 15K. We only insert the supplier c
> > but has not inserted any speed information.
> >
> > which one is the right understanding? Anyone knows whether there are any
> > predefined semantics of TS in HBase?
> >
> > regards!
> >
> > Yong
> >
>

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