Hi Jean, Here is what Alexander wrote about it, a few months ago, in the comments of the article mentioned above:
"A full repair is an incremental one that doesn't skip repaired data. > Performing anticompaction in that case too (regardless it is a valid > approach or not) allows to mark as repaired SSTables that weren't before > the full repair was started. > > It was clearly added with the intent of making full repair part of a > routine where incremental repairs are also executed, leaving only subrange > for people who do not want to use incremental. > > One major drawback is that by doing so, the project increased the > operational complexity of running full repairs as it does not allow > repairing the same keyspace from 2 nodes concurrently without risking some > failures during validation compaction (when an SSTable is being > anticompacted, it cannot go through validation compaction)." > > I hope this helps, C*heers, ----------------------- Alain Rodriguez - @arodream - al...@thelastpickle.com France / Spain The Last Pickle - Apache Cassandra Consulting http://www.thelastpickle.com 2018-05-23 21:48 GMT+01:00 Lerh Chuan Low <l...@instaclustr.com>: > Hey Jean, > > I think it still does anticompaction by default regardless, it will not do > so only if you do subrange repair. TLP wrote a pretty good article on that: > http://thelastpickle.com/blog/2017/12/14/should- > you-use-incremental-repair.html > > On 24 May 2018 at 00:42, Jean Carlo <jean.jeancar...@gmail.com> wrote: > >> Hello >> >> I just want to understand why, if I run a repair non incremental like this >> >> nodetool -h 127.0.0.1 -p 7100 repair -full -pr keyspace1 standard1 >> >> Cassandra does anticompaction as the logs show >> >> INFO [CompactionExecutor:20] 2018-05-23 16:36:27,598 >> CompactionManager.java:1545 - Anticompacting [BigTableReader(path='/home/jr >> iveraura/.ccm/test/node1/data0/keyspace1/standard1-36a6ec405 >> e9411e8b1d1b38a73559799/mc-2-big-Data.db')] >> >> As far as I understood the anticompactions are used to make the repair >> incremantals possible, so I was expecting no having anticompactions making >> repairs with the options -pr -full >> >> Anyone knows why does cassandra make those anticompactions ? >> >> Thanks >> >> Jean Carlo >> >> "The best way to predict the future is to invent it" Alan Kay >> > >
