Hi Alex: we have a functionality which allows users to delete the data stored in hbase but once in awhile, users can call us to undelete certain data that have been deleted a hour/day ago. Since we run major compaction weekly, my wishful thinking was that the data is still there and can be recovered if we can just delete the delete marker. It seems it is not as easy as I initially thought after reading the replies. Lars suggestion requires read the deleted data and write it back which can be expensive.
Best Regards, Jerry On Wed, Sep 19, 2012 at 10:07 AM, Alex Baranau <[email protected]>wrote: > Hi Jerry, > > Just out of the curiosity: what is your use-case? Why do you want to do > that? To gain extra protection from software error or smth else? > > Alex Baranau > ------ > Sematext :: http://sematext.com/ :: Hadoop - HBase - ElasticSearch - Solr > > On Tue, Sep 18, 2012 at 6:32 PM, lars hofhansl <[email protected]> > wrote: > > > Can't do it (without low level massing HFiles, which you do not want to > > do). > > The best you can do (if you have HBASE-4536 and enabled > KEEP_DELETED_CELLS > > for you column family) is to read the deleted rows back and write them > > again with a newer TS. > > > > -- Lars > > > > > > > > ________________________________ > > From: Jerry Lam <[email protected]> > > To: [email protected] > > Sent: Tuesday, September 18, 2012 3:06 PM > > Subject: Undelete Rows > > > > Hi HBase Community: > > > > I wonder if it is possible to undelete the rows that have been marked for > > deletion before the major compaction kicks in? > > > > I read about HBASE-4536 but I'm not sure if this can effectively remove > the > > tombstone marker? > > > > Any input is appreciated. > > > > Best Regards, > > > > Jerry > > >
