I use this bit from the link sent by Sonal: reverse_order_stamp is an 8 byte, big endian long with a value of (Long.MAX_VALUE - epoch). This is so the most recent stamp is at the top rather than the bottom.
I use (Long.MAX_VALUE - System.getCurrentTimeMillis()). -Steve -----Original Message----- From: Mark [mailto:[email protected]] Sent: Saturday, August 20, 2011 6:29 AM To: [email protected] Subject: Re: Reverse timestamp Thanks but I was more referring to reverse ordered timestamps for composite keys to be used for sorting purposes. On 8/19/11 10:26 PM, lars hofhansl wrote: > HBase maps (row-key, column family name, column, timestamp) to a value. > > The KeyValues are also sorted by the same attributes in reverse timestamp > order. > > The default timestamp is the current time, but you can set any long value > (which does not need correlate in any way to the time domain) > as the time stamp and hence define your own ordering within multiple version > of the same row key. > > See Put: Put(byte[] row, long ts). > > Is that what you meant? > > -- Lars > > > > ________________________________ > From: Mark<[email protected]> > To: [email protected] > Sent: Friday, August 19, 2011 6:39 PM > Subject: Reverse timestamp > > I understand the need but I don't understand how to generate a reverse > timestamp. Can someone please explain how this is accomplished and how I can > test that its working correctly? > > Thanks
