OK Thanks,
But I also read that repair will take a snapshot. Due to the fact that I have
Replication factor 3 for my keyspace, I run nodetool clearsnapshot to keep disk
space use to a minimum. Will this impact my repair?
On Tuesday, January 13, 2015 4:19 PM, Jan Kesten <j.kes...@enercast.de>
wrote:
Hi,
I have read that snapshots are basicaly symlinks and they do not take that
much space. Why if I run nodetool clearsnapshot it frees a lot of space? I am
seeing GBs freed...
both together makes sense. Creating a snaphot just creates links for all files
unter the snapshot directory. This is very fast and takes no space. But those
links are hard links, not symbolic ones.
After a while your running cluster will compact some of its sstables and
writing it to a new one as deleting the old ones. Now for example you had
SSTable1..4 and a snapshot with the links to those four after compaction you
will have one active SSTable5 which is newly written and consumes space. The
snapshot-linked ones are still there, still consuming their space. Only when
this snapshot is cleared you get your disk space back.
HTH,
Jan
