Re: Commit log size vs memtable total size

2016-03-01 Thread Vlad
Tyler, thanks for explanation! So commit segment can contain both data from flushed table A and non-flushed table B.How is it replayed on start up? Does C* skip portions belonging to table A that already were written to SSTable? Regards, Vlad On Tuesday, March 1, 2016 11:37 PM, Tyler Hobbs

Re: Commit log size vs memtable total size

2016-03-01 Thread Jack Krupansky
It would be nice to get this info into the doc or at least a blog post. -- Jack Krupansky On Tue, Mar 1, 2016 at 4:37 PM, Tyler Hobbs wrote: > > On Tue, Mar 1, 2016 at 6:13 AM, Vlad wrote: > >> So commit log can't keep more than memtable size, why is difference in >> commit log and memtables s

Re: Commit log size vs memtable total size

2016-03-01 Thread Tyler Hobbs
On Tue, Mar 1, 2016 at 6:13 AM, Vlad wrote: > So commit log can't keep more than memtable size, why is difference in > commit log and memtables sizes? In order to purge a commitlog segment, *all* memtables that contain data from that segment must be flushed to disk. Suppose you have two tables

Re: commit log size

2011-12-16 Thread Alexandru Dan Sicoe
Hi Maxim, Sorry for the late reply but I was away for a course. Lower the memtable_flush_after_mins for your low traffic CFs. If in the meantime you upgraded to 1.0 (which by the way 1.0.3 for me ended not working and me converting a lot of data to it) I think there was a discussion you sent me on

Re: commit log size

2011-12-14 Thread Maxim Potekhin
Alexandru, Jeremiah -- what setting needs to be tweaked, and what's the recommended value? I observed similar behavior this morning. Maxim On 11/28/2011 2:53 PM, Jeremiah Jordan wrote: Yes, the low volume memtables are causing the problem. Lower the thresholds for those tables if you don't

Re: commit log size

2011-11-29 Thread Alexandru Dan Sicoe
Ok, thanks! On Mon, Nov 28, 2011 at 8:53 PM, Jeremiah Jordan < jeremiah.jor...@morningstar.com> wrote: > Yes, the low volume memtables are causing the problem. Lower the > thresholds for those tables if you don't want the commit logs to go crazy. > > -Jeremiah > > > On 11/28/2011 11:11 AM, Alexa

Re: commit log size

2011-11-28 Thread Jeremiah Jordan
Yes, the low volume memtables are causing the problem. Lower the thresholds for those tables if you don't want the commit logs to go crazy. -Jeremiah On 11/28/2011 11:11 AM, Alexandru Dan Sicoe wrote: Hello everyone, 4 node Cassandra 0.8.5 cluster with RF=2, replica placement strategy = Sim