Hi Anil, I created HBASE-6093 <https://issues.apache.org/jira/browse/HBASE-6093>with an idea that could solve this problem. It could be a simple implementation for simple workloads, but gets harder to support for tables with TTL's, maxVersion > 1, Deletes, etc... Maybe it can only be enabled if the other ColumnFamily settings are compatible.
Matt On Thu, May 24, 2012 at 9:37 PM, Ted Yu <yuzhih...@gmail.com> wrote: > 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 <anoo...@huawei.com> > 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 [anilgupt...@gmail.com] > > Sent: Friday, May 25, 2012 3:21 AM > > To: user@hbase.apache.org > > 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 > > >
