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From Ted Yu <yuzhih...@gmail.com>
Subject Re: Can a put delete other values?
Date Sun, 13 Dec 2015 23:30:04 GMT
The Maximum Number of Versions for a Column Family applies to the row.
In your case, subsequent writes cause the max versions to be reached,
leading to the behavior you observed.

See also http://hbase.apache.org/book.html#specify.number.of.versions

Cheers


On Sun, Dec 13, 2015 at 2:39 PM, Mike Thomsen <mikerthomsen@gmail.com>
wrote:

> I think our TTL is whatever is or functionally is "forever." We have a max
> of 3 versions on those column families. When I do that put several times
> (it's in a Storm topology, so it might get sent a dozen times if another
> bolt fails), will that overwrite just the affected cells or affect
> everything in the column family or even the entire row?
>
> Thanks,
>
> Mike
>
> On Sun, Dec 13, 2015 at 5:14 PM, Ted Yu <yuzhihong@gmail.com> wrote:
>
> > The put for q4, q5, q6 and q7 wouldn't overwrite existing rows.
> >
> > When were the columns q1 to q3 written ?
> > What is the TTL for your table ?
> >
> > Thanks
> >
> > On Sun, Dec 13, 2015 at 12:36 PM, Mike Thomsen <mikerthomsen@gmail.com>
> > wrote:
> >
> > > I noticed that our test data set is suddenly missing a lot of data,
> and I
> > > am wondering if it's because I'm misunderstanding how HBase handles
> puts.
> > >
> > > Suppose we have 3 families: ca, cb and cc.
> > >
> > > Before on row abcde-fgh-ijkl
> > >
> > > ca:q1=....
> > > ca:q2=....
> > > ca:q3=....
> > > cb:q1=....
> > > cb:q2=....
> > > cc:q1=....
> > >
> > > We send a put that adds q4, q5, q6 and q7.
> > >
> > > Now the row looks like this:
> > > ca:q4=....
> > > ca:q5=....
> > > ca:q6=....
> > > ca:q7=....
> > >
> > > I thought a PUT would just add data. It looks like it's overwriting the
> > > entire row.
> > >
> >
>

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