Hello, It's hard to say what the best configuration is.
*max_hints_delivery_threads*: I think it's said you should use 2 delivery thread per DC (as a starting point). *max_hint_window_in_ms:* depends on your need (and what the cluster can bear of course). Generally, the default of 3 hours is used. *hinted_handoff_throttle_in_kb:* this one is a trickier one. You want to reduce it for hints delivery not to be harmful. See the description here: http://cassandra.apache.org/doc/4.0/configuration/cassandra_config_file.html?highlight=max_hints_delivery_threads#hinted-handoff-throttle-in-kb *Notes:* - if the cluster crashed, it might not be directly due to hints, but to the pressure on the remaining nodes, that is too big for nodes to cope with. - C*3+ (off the top of my head) is storing hints in files rather than using a system table. This should be way more reliable. If you're still using a version of Cassandra storing hints in the system table, you might want to upgrade? C*heers, ----------------------- Alain Rodriguez - al...@thelastpickle.com France / Spain The Last Pickle - Apache Cassandra Consulting http://www.thelastpickle.com Le jeu. 1 nov. 2018 à 16:22, Ghazi Naceur <ghazi.naceur.cont...@gmail.com> a écrit : > Hello everyone, > > I have a problem with the hints in my cluster. > In fact, my cluster is composed of 5 nodes : 3 nodes in DC1 and 2 nodes in > DC2. > The size of the hints folder increases rapidly and it reaches nearly the > 90% of the hard drive (50 Gb). > The test scenario is the following : I applied 1000 UPDATE requests per > second on the first DC. I wanted to make this test lasts 3 hours. The first > node of the second DC stopped, and after few minutes, the second node > stopped as well. The hints files started to increase rapidly and consumed a > big part of my hard drive. > This test fails after few minutes. > The replication factor is 2 for both DCs and the consistency level is > LOCAL_ONE. > Could you please tell me what is the best configuration of the hints > properties : hinted_handoff_throttle_in_kb, max_hint_window_in_ms and > max_hints_delivery_threads ? > > Best regards. >
