-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Mitch,
On 9/12/18 12:01 PM, Mitch Claborn wrote: > Thanks Mark. I changed to channelSendOptions="2" and the failure > rate of my health check program has dropped significantly, down to > 1 - 2 per 24 hours. > > I did quite a bit of reading in the doc before posting this, but > your explanation of the options is much better than the doc. I > suggest that the doc be updated with your explanation below. I > would put it in the following locations: > http://tomcat.apache.org/tomcat-9.0-doc/cluster-howto.html#Cluster_Inf ormation > > > > http://tomcat.apache.org/tomcat-9.0-doc/config/cluster.html#SimpleTcpC luster_Attributes > > > > and also in the javadoc for Channel.java Would you care to submit a documentation patch/PR? Get your name in the ChangeLog and you get the text that makes the most sense to you :) - -chris > On 09/10/2018 03:15 PM, Mark Thomas wrote: >> On 10/09/18 17:33, Mitch Claborn wrote: >>> Further information and questions. >>> >>> I created my own interceptor based on ThroughputInterceptor so >>> that I could log the timing of specific sessions to correlate >>> them with the failures in my health check program. I was >>> surprised to find that in those instances where the health >>> check reported a failure, the interceptor reported that the >>> session send was accomplished in < 5 ms, while the health check >>> app is waiting a full 1000 ms between calls to the different >>> tomcat instances. So now I'm more confused than ever. >>> >>> Anyone have any ideas? >>> >>> In a ChannelInterceptor, does when >>> getNext().sendMessage(destination, msg, payload) returns, does >>> that mean that the message has been sent AND received by the >>> recipient member, or does that only indicate a send? >> >> You are using: channelSendOptions="8" >> >> That means that, as far as the sender is concerned, the message >> is sent as soon as it has been placed in the queue on the sender >> for transmission to the other nodes. >> >> If you use async sending, the options to enable ACKS don't offer >> very much - if anything. >> >> If you configure channelSendOptions="2" the the sender will block >> the completion of the current request until all of the receiving >> nodes have acknowledged that they have received the message. >> >> If you configure channelSendOptions="6" the the sender will block >> the completion of the current request until all of the receiving >> nodes have acknowledged that they have received and processed the >> message. >> >> There is a trade-off here between throughput on the sender vs >> reliability of replication if the sender fails. >> >> Mark >> >> --------------------------------------------------------------------- >> >> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >> For additional commands, e-mail: users-h...@tomcat.apache.org >> >> > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Thunderbird - https://www.enigmail.net/ iQIzBAEBCAAdFiEEMmKgYcQvxMe7tcJcHPApP6U8pFgFAluZQLAACgkQHPApP6U8 pFjEsBAAg1VStKh6RAUiZdsV//AuDtNEzRGHzNiXxOfqsKkyLqki474aKgFFuDkm Be/kpvmkN8w2Z+8gKuTstLCGVAGTW9/3X4AEPgfvF3KFpb25qkJv3HCYbjOgLIej Mym4+WYSV/SYvPZhUc2qvreiKtL9fW81Qc2Cb5E4d8+qHTzIAjqA3/qjlYIV0So+ Cq6EIVbY9aqkx8qOygiRI3VHRPL7tRExvC6wqvYP8XPHK8xV2y3cmiGrrjWsu+tD tk0dOh8O1j4zzxVvTIE/LxkSRXKtKO9s2A+CaxgmQwYG+Ljn9XzxGXC6qRa/9WNX cFGHk+KPy6RjH6XY9WXUHChMi+RFERCgfIJgiKrWkPsfeENbAGQeqi6aAp3GjjTX w6U5dggBd5NSzTDOJJ/0DV466hmQ4HiJj2wo1gKdQh0f78RHbLkuLfjuCPGw21Yk 4ou9jxGcZoFnaVvA1ymGuyEVysHV1KHY8/+KU0BNPHbNVDZz/ZuSL6NL+2cA5UaR j0LQOrJ/EScKb+60CqkmEDvc4y52Yfw216ghKUBObG7UA7h26l0ZmCEqt6VszSeG BiDXwV90TgR3OLgqXIbxfC88P3wFHyV1OCESs5Bsm4JpuX18E8ptvuTcsmv4vn5h JCunc+NWQ/WZz9p4l2hCCmVrbbdYK6MHHq7SnEk27FU1YpIVbYQ= =uEhw -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
