Re: Proposal - GroupCommitLogService

2017-05-13 Thread Yuji Ito
t. > > https://issues.apache.org/jira/browse/CASSANDRA/ > <https://issues.apache.org/jira/browse/CASSANDRA/?selectedTab=com.atlassian.jira.jira-projects-plugin:summary-panel> > > -Jeremiah > > On May 13, 2017, at 7:21 AM, Yuji Ito <y...@imagine-orb.com> wrote: >

Re: Proposal - GroupCommitLogService

2017-05-13 Thread Yuji Ito
by the window time. Yuji On Sat, May 13, 2017 at 11:49 PM, Jonathan Ellis <jbel...@gmail.com> wrote: > Can we replace Batch entirely with this, or are there situations where > Batch would outperform (in latency, for instance)? > > On Sat, May 13, 2017 at 7:21 AM, Yuji Ito <

Proposal - GroupCommitLogService

2017-05-13 Thread Yuji Ito
Hi dev, I propose a new CommitLogService, GroupCommitLogService, to improve the throughput when lots of requests are received. It improved the throughput by maximum 94%. I'd like to discuss about this CommitLogService. Currently, we can select either 2 CommitLog services; Periodic and Batch. In

Re: Proposal - GroupCommitLogService

2017-05-13 Thread Yuji Ito
hat Batch is not working as designed? If there are other > pending writes, Batch should also group them together. (Did you test with > giving Batch the same window size as Group?) > > On Sat, May 13, 2017 at 10:08 AM, Yuji Ito <y...@imagine-orb.com> wrote: > >> Batch outp

TTL of paxos table

2018-08-29 Thread Yuji Ito
Hi, I wonder why records on the system.paxos table aren't removed, though all records are updated with TTL (at least 3 hours). That's because gc_grace_seconds of system.paxos table is always 0 and users can't change that value of System keyspace! Why is the TTL of paxos record invalidated? Or,

Jepsen testing

2018-11-08 Thread Yuji Ito
Our tests are based on riptano's great work. https://github.com/riptano/jepsen/tree/cassandra/cassandra I refined it for the latest Jepsen and removed some tests. Next, I'll fix clock-drift tests. I would like to get your feedback. Thanks, Yuji Ito

Re: Jepsen testing

2018-11-08 Thread Yuji Ito
> > Thanks so much for working on this! Any fault injection testing is > > certainly worth the effort. > > > > Thanks, > > -Nate > > On Thu, Nov 8, 2018 at 1:36 PM Yuji Ito wrote: > > > > > > Hi, > > > > > > We are working

Re: Jepsen testing

2018-11-09 Thread Yuji Ito
investigating that issue. That would be a great idea if our work will be included in the regular testing drill. Thanks, Yuji 2018年11月9日(金) 17:27 Oleksandr Shulgin : > On Thu, Nov 8, 2018 at 10:42 PM Yuji Ito wrote: > > > > > We are working on Jepsen testing for Cassandra. > > h

Inter-node messaging latency

2018-11-25 Thread Yuji Ito
Hi, I'm investigating LWT performance with C* 3.11.3. It looks that the performance is bounded by messaging latency when many requests are issued concurrently. According to the source code, the number of messaging threads per node is only 1 thread for incoming and 1 thread for outbound "small"

Re: Inter-node messaging latency

2018-11-27 Thread Yuji Ito
ing Netty in 4.0. It will be better to > test it using that as potential changes will mostly land on top of that. > > On Mon, Nov 26, 2018 at 7:39 AM Yuji Ito wrote: > >> Hi, >> >> I'm investigating LWT performance with C* 3.11.3. >> It looks that the performance is