More compactions meaning "rows to be compacted" or actual number of pending compactions? I assumed when I run nodetool compactionstats the number of pending tasks would line up with number of sstables that will be compacted. Most of the time this is idle, then we hit spots when it could jump into the thousands and we and up being short of a few hundred GB of disk space.
On Sun, Oct 23, 2016 at 5:49 PM, kurt Greaves <k...@instaclustr.com> wrote: > > On 22 October 2016 at 03:37, Seth Edwards <s...@pubnub.com> wrote: > >> We're using TWCS and we notice that if we make changes to the options to >> the window unit or size, it seems to implicitly start recompacting all >> sstables. > > > If you increase the window unit or size you potentially increase the > number of SSTable candidates for compaction inside each window, which is > why you would see more compactions. If you decrease the window you > shouldn't see any new compactions kicked off, however be aware that you > will have SSTables covering multiple windows, so until a full cycle of your > TTL passes your read queries won't benefit from the smaller window size. > > Kurt Greaves > k...@instaclustr.com > www.instaclustr.com >
