2011. 4. 16., 오후 2:21, Ted Dunning 작성: > You know, I think it would help if you would answer some of the questions > that people have posed. > > You say that it takes 1000 clients over 8 seconds to register. That is about > 100 transactions per second.
Ted. Sorry. Real reproducing scenario isn't what I mentioned initially. It is not login, it is session expiring and closing process. I know, we had test ZK many times well above this in our environment, and saw no problem. So sorry about confusion. > That is two orders of magnitude slower than others have observed ZK to be. > This is a really big difference. > > So there is a big discrepancy here. I am not saying you didn't observe what > you say, but I do think that there is something that you haven't mentioned > because you haven't noticed it yet. If you go through the questions people > have asked and answer them, there is a good chance you will notice something > that is causing your problems. There is likely to be a problem in the way > that you have set up your machines. > > One pending question is whether you have separate log and snapshot disks. Do > you? I have already answered this. I have no separate disk. We have one filesystem mount point with RAID1 disks. > Another is whether you have other processes running on the disk. Are there? Our ZK ensemble server are dedicated to ZK ensemble only > Another is a request that you post some of the output of iostat with 5 second > sampling rate. Can you post that output? I will. It will be on Monday though. But please note that I used to be a kernel filesystem engineer, and I know how to read iostat ;) > There are others questions that you will find in the email history. > > Remember, people answering your questions here are doing so because they are > nice and because they like to build a sense of community. But to get a lot > from them, you need to work with them. Please let me know if there are questions to be answered I will try to update JIRA with answers in these emails. Thank you. > > 2011/4/15 Chang Song <tru64...@me.com> > > I have file a JIRA bug > > https://issues.apache.org/jira/browse/ZOOKEEPER-1049 > > > We have measured I/O wait again, but found no IO activity due to ZK. > Just regular page cache sync daemon in the work: 0-3%. > > I will have my team to attach ZK stat result. > > Thanks a lot. > Let's move this discussion to JIRA > > > 2011. 4. 15., 오전 7:34, Ted Dunning 작성: > > > You said that, but there was some skepticism from others about this. > > > > You need to try the monitoring that was suggested. 5 minute averages are > > not useful. > > > > What does the stat four letter command return? ( > > http://zookeeper.apache.org/doc/r3.1.2/zookeeperAdmin.html#sc_zkCommands ) > > > > 2011/4/14 Chang Song <tru64...@me.com> > > > >> 2. We have a boot disk and usr disk. > >> But as I said, disk I/O is not an issue that's causing 8 second delay. > >> > >
