hhmm. I will try both. thanks On Mon, Apr 30, 2012 at 11:29 PM, Tyler Hobbs <ty...@datastax.com> wrote:
> Err, sorry, I should have said ts - (ts % 86400). Integer division does > something similar. > > > On Mon, Apr 30, 2012 at 12:39 PM, samal <samalgo...@gmail.com> wrote: > >> thanks I didn't noticed. >> run script for 5 minutes => divide seems to produce result ,modulo is >> still changing. If divide is ok will do the trick. >> I will run this script on Singapore, East coast server, and New delhi >> server whole night today. >> >> ====================== >> unix => 1335806983422 >> unix /1000 => 1335806983.422 >> Divid i/86400 => 15460.728969907408 >> Divid i/86400 INT => 15460 >> Modulo i%86400 => 62983 >> ====================== >> ====================== >> unix => 1335806985421 >> unix /1000 => 1335806985.421 >> Divid i/86400 => 15460.728993055556 >> Divid i/86400 INT => 15460 >> Modulo i%86400 => 62985 >> ====================== >> ====================== >> unix => 1335806987422 >> unix /1000 => 1335806987.422 >> Divid i/86400 => 15460.729016203704 >> Divid i/86400 INT => 15460 >> Modulo i%86400 => 62987 >> ====================== >> ====================== >> unix => 1335806989422 >> unix /1000 => 1335806989.422 >> Divid i/86400 => 15460.729039351852 >> Divid i/86400 INT => 15460 >> Modulo i%86400 => 62989 >> ====================== >> ====================== >> unix => 1335806991421 >> unix /1000 => 1335806991.421 >> Divid i/86400 => 15460.7290625 >> Divid i/86400 INT => 15460 >> Modulo i%86400 => 62991 >> ====================== >> ====================== >> unix => 1335806993422 >> unix /1000 => 1335806993.422 >> Divid i/86400 => 15460.729085648149 >> Divid i/86400 INT => 15460 >> Modulo i%86400 => 62993 >> ====================== >> ====================== >> unix => 1335806995422 >> unix /1000 => 1335806995.422 >> Divid i/86400 => 15460.729108796297 >> Divid i/86400 INT => 15460 >> Modulo i%86400 => 62995 >> ====================== >> ====================== >> unix => 1335806997421 >> unix /1000 => 1335806997.421 >> Divid i/86400 => 15460.729131944445 >> Divid i/86400 INT => 15460 >> Modulo i%86400 => 62997 >> ====================== >> ====================== >> unix => 1335806999422 >> unix /1000 => 1335806999.422 >> Divid i/86400 => 15460.729155092593 >> Divid i/86400 INT => 15460 >> Modulo i%86400 => 62999 >> ====================== >> >> >> On Mon, Apr 30, 2012 at 10:44 PM, Tyler Hobbs <ty...@datastax.com> wrote: >> >>> getTime() returns the number of milliseconds since the epoch, not the >>> number of seconds: http://www.w3schools.com/jsref/jsref_gettime.asp >>> >>> If you divide that number by 1000, it should work. >>> >>> >>> On Mon, Apr 30, 2012 at 11:28 AM, samal <samalgo...@gmail.com> wrote: >>> >>>> I did it with node.js but it is changing after some interval. >>>> >>>> <code> >>>> setInterval(function(){ >>>> var d =new Date().getTime(); >>>> console.log("====================== "); >>>> console.log("unix => ",d); >>>> i=parseInt(d) >>>> console.log("Divid i/86400=> ",i/86400); >>>> console.log("Modulo i%86400=> ",i%86400); >>>> console.log("====================== "); >>>> },2000); >>>> >>>> </code> >>>> Am I doing wrong? >>>> >>>> >>>> On Mon, Apr 30, 2012 at 9:54 PM, Tyler Hobbs <ty...@datastax.com>wrote: >>>> >>>>> Correct, that's exactly what I'm saying. >>>>> >>>>> >>>>> On Mon, Apr 30, 2012 at 10:37 AM, samal <samalgo...@gmail.com> wrote: >>>>> >>>>>> thanks tyler for reply. >>>>>> >>>>>> are you saying user1uuid_*{ts%86400}* would lead to unique day >>>>>> bucket which will be timezone {NZ to US} independent? I will try. >>>>>> >>>>>> >>>>>> On Mon, Apr 30, 2012 at 8:25 PM, Tyler Hobbs <ty...@datastax.com>wrote: >>>>>> >>>>>>> Don't use dates or datestamps as the buckets for your row keys, use >>>>>>> a unix timestamp modulo whatever size you want your bucket to be >>>>>>> instead. >>>>>>> Timestamps don't involve time zones or any of that nonsense. >>>>>>> >>>>>>> So, instead of having keys like "user1uuid_30042012", the second >>>>>>> half would be replaced the current unix timestamp mod 86400 (the number >>>>>>> of >>>>>>> seconds in a day). >>>>>>> >>>>>>> >>>>>>> On Mon, Apr 30, 2012 at 1:46 AM, samal <samalgo...@gmail.com> wrote: >>>>>>> >>>>>>>> Hello List, >>>>>>>> >>>>>>>> I need suggestion/ recommendation on time series data. >>>>>>>> >>>>>>>> I have requirement where users belongs to different timezone and >>>>>>>> they can subscribe to global group. >>>>>>>> When users at specific timezone send update to group it is >>>>>>>> available to every user in different timezone. >>>>>>>> >>>>>>>> I am using GroupSubscribedUsers CF where all update to group are >>>>>>>> push to "Each User" time line, and key is timelined by >>>>>>>> useruuid_date(one >>>>>>>> day update of all groups) and columns are group updates. >>>>>>>> >>>>>>>> GroupSubscribedUsers ={ >>>>>>>> user1uuid_30042012:{//this user belongs to same timezone >>>>>>>> timeuuid1:JSON[group1update1] >>>>>>>> timeuuid2:JSON[group2update2] >>>>>>>> timeuuid3:JSON[group1update2] >>>>>>>> timeuuid4:JSON[group4update1] >>>>>>>> }, >>>>>>>> user2uuid_30042012:{//this user belongs to different timezonewhere >>>>>>>> date has changed already to 1may but 30 april is getting update >>>>>>>> timeuuid1:JSON[group1update1] >>>>>>>> timeuuid2:JSON[group2update2] >>>>>>>> timeuuid3:JSON[group1update2] >>>>>>>> timeuuid4:JSON[group4update1] >>>>>>>> timeuuid5:JSON[groupNupdate1] >>>>>>>> }, >>>>>>>> >>>>>>>> } >>>>>>>> >>>>>>>> I have noticed this approach is good for single time zone when >>>>>>>> different timezone come into picture it breaks. >>>>>>>> >>>>>>>> I am thinking of like when user pushed update to group ->get user >>>>>>>> who is subscribed to group->check user timezone->push time series in >>>>>>>> user >>>>>>>> time zone. So for one user update will be on 30april where as other may >>>>>>>> have on 29april and 1may, using timestamps i can find out hours ago >>>>>>>> update >>>>>>>> came. >>>>>>>> >>>>>>>> Is there any better approach? >>>>>>>> >>>>>>>> >>>>>>>> Thanks, >>>>>>>> >>>>>>>> >>>Samal >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>> >>>>>>> >>>>>>> -- >>>>>>> Tyler Hobbs >>>>>>> DataStax <http://datastax.com/> >>>>>>> >>>>>>> >>>>>> >>>>> >>>>> >>>>> -- >>>>> Tyler Hobbs >>>>> DataStax <http://datastax.com/> >>>>> >>>>> >>>> >>> >>> >>> -- >>> Tyler Hobbs >>> DataStax <http://datastax.com/> >>> >>> >> > > > -- > Tyler Hobbs > DataStax <http://datastax.com/> > >
