Hello Sylvain, El 17/04/2010, a las 12:09, Sylvain Lebresne escribió:
> On Sat, Apr 17, 2010 at 4:52 PM, Lucas Di Pentima > <lu...@di-pentima.com.ar> wrote: >> Hello Jonathan, >> >> I supposed the same, that's why I tried the count_columns() call, but when I >> try it with some big SCF, I get the same error message: >> >> Thrift::TransportException: Socket: Timed out reading 4096 bytes from >> 127.0.0.1:9160 >> >> Should I use count_columns() or is there any other way to know how much >> columns exists? > > get_count() (that, even though I don't know the ruby gem, is most > probably used by > count_columns() under the hood) actually query the whole row and > simply return the number > of column founded. Hence the only thing you gain by counting columns > instead of requesting > them is that you don't have to pull all the columns over the network. > Hence counting is (roughly) as costly as requesting the whole row and > as such, it is no wonder > it timeout in your case. > Thanks for the explanation, so in the case I need to fetch all the columns on a big ColumnFamily, I should request a few thousands at a time as Jonathan told me, using the start parameter, until I get no more columns, am I right? Best regards, -- Lucas Di Pentima - Santa Fe, Argentina Jabber: lu...@di-pentima.com.ar MSN: ldipent...@hotmail.com
