Hi, Doug
We added some code in MergeScanner::initialize() and
MergeScanner::forward() after we get the m_cell_cutoff.
// in initialize()
m_cell_cutoff = m_scan_context_ptr-
>family_info[key.column_family_code].cutoff_time;
if (m_cell_cutoff) {
if (!m_return_everything && m_cell_cutoff >
key.timestamp )
forward();
}
in MergeScanner::forward()
if (m_cell_cutoff) {
if (!m_return_everything && m_cell_cutoff >
key.timestamp )
continue;
}
And as my opinion, the parameter "ts" of the function "ScanContext"
should be the current time other than the last timestamp of the range
as the source code do at now. As we need to delete some data weekly,
using the current time should be more reasonable.
So I changed the parameter "ts" of ScanContext(...) in function
RangeServer::create_scanner to the clock time of the computer. And now
it seems that it works. I'll test it in the next several days. And can
you give me some suggestions. Thank you.
On Sep 9, 12:32 am, "Doug Judd" <[EMAIL PROTECTED]> wrote:
> Hi Pheoenix,
>
> This is one of those features that never quite got fully implemented. I'm
> in the process of doing some work on the timestamps / version numbers.
> After I get that work checked in, that would be a good time to get the TTL
> column family garbage collection working. I filed issue
> 160<http://code.google.com/p/hypertable/issues/detail?id=160>for this.
> Thanks for reporting this.
>
> - Doug
>
> On Mon, Sep 8, 2008 at 6:21 AM, Phoenix <[EMAIL PROTECTED]> wrote:
>
> > Hi, all
>
> > We tried to test the attribute "TTL" of the column family, but we
> > could not find out any affects of this attr. We read the source code,
> > and still are confused about it.
>
> > In /src/cc/Hypertable/RangeServer/ScanContext.cc, we find that it is
> > minused by the var "ts", What is ts---the time at now, I guess? And
> > what does "cutoff_time" mean?
>
> > We traced it, and then found that it is assigned to m_cell_cutoff in
> > src/cc/Hypertable/RangeServer/MergeScanner.cc, but this is never
> > referred. Does anyone know why?
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