Soft delete = logical delete - which is an update. An update doesnt create a tombstone . It appends to the sstable,and when they are compacted, the latest write is what is seen as the definitive data.
A tombstone by definition is an update which tells C* to remove the value that was there before, but doesn’t do it immediately . On May 28, 2018, 2:32 AM -0400, onmstester onmstester <onmstes...@zoho.com>, wrote: > How update is working underneath? > Does it create a new row (because i'm changing a column of partition key) and > add a tombstone to the old row? > > Sent using Zoho Mail > > > ============ Forwarded message ============ > From : Jonathan Haddad <j...@jonhaddad.com> > To : <user@cassandra.apache.org> > Date : Mon, 28 May 2018 00:07:36 +0430 > Subject : Re: cassandra update vs insert + delete > ============ Forwarded message ============ > > > What is a “soft delete”? > > > > My 2 cents, if you want to update some information just update it. There’s > > no need to overthink it. > > > > Batches are good if they’re constrained to a single partition, not so hot > > otherwise. > > > > > > On Sun, May 27, 2018 at 8:19 AM Rahul Singh <rahul.xavier.si...@gmail.com> > > wrote: > > > > -- > > Jon Haddad > > http://www.rustyrazorblade.com > > twitter: rustyrazorblade > > > Deletes create tombstones — not really something to consider. Better to > > > add / update or insert data and do a soft delete on old data and apply a > > > TTL to remove it at a future time. > > > > > > -- > > > Rahul Singh > > > rahul.si...@anant.us > > > > > > Anant Corporation > > > > > > On May 27, 2018, 5:36 AM -0400, onmstester onmstester > > > <onmstes...@zoho.com>, wrote: > > > > > > > Hi > > > > I want to load all rows from many partitions and change a column value > > > > in each row, which of following ways is better concerning disk space > > > > and performance? > > > > 1. create a update statement for every row and batch update for each > > > > partitions > > > > 2. create an insert statement for every row and batch insert for each > > > > partition, then run a single statement to delete the whole old partition > > > > > > > > Thanks in advance > > > > > > > > Sent using Zoho Mail > > > > > >
