What Anoop said is in 0.94.0 For trunk, HBASE-4676 provides trie data block encoding. It suits write-once read-many use case very well.
Cheers On Thu, May 24, 2012 at 5:57 PM, Anoop Sam John <[email protected]> wrote: > Hi Anil, > There is no way you can avoid the timestamp with KVs. In your > case you can think of using data block encoding? You can see > FastDiffDeltaEncoder and DiffKeyDeltaEncoder. This includes way of avoiding > writing the 8 bytes into each KV for timestamp. Still some bytes will be > written though and this will be done at the block level. Also pls note that > these encoders will do much more things than the timestamp space > optimization. Also you need to make sure to pass some timestamp in your > Puts. May be better make as 0L. Else in RS side HBase will assign the cur > time as the timestamp. Hope when u read the javadoc for these encoder > classes, u will be more clear. > > The one you are telling abt having a feature to fully avoid the timestamp > is a topic to discuss > > Hope I make it clear to you > > -Anoop- > ________________________________________ > From: anil gupta [[email protected]] > Sent: Friday, May 25, 2012 3:21 AM > To: [email protected] > Subject: Disable timestamp in HBase Table a.k.a Disable Versioning in > HBase Table > > Hi All, > > We are planning to store data in HBase. Currently, in one of our use case > once a row is written into HBase Table we wont be modifying the data of > that row. Since, for every cell(right?) in HBase a timestamp(long value) is > stored; this would take up extra 8 bytes. I was thinking is there a way to > disable timestamp on HBase table when versioning is not required. I went > through the documentation and searched mailing list for same but could not > find anything relevant. Since we are talking about billions of cells, this > would add up to significant amount of space.(around 7.45 GigaBytes for 1 > billion cells). Does this sounds like a feature HBase is missing? > > Please share your thoughts. > > -- > Thanks & Regards, > Anil Gupta >
