FD_HOST many false suspect with Full GC --------------------------------------- Key: JGRP-1898 URL: https://issues.jboss.org/browse/JGRP-1898 Project: JGroups Issue Type: Enhancement Affects Versions: 3.5.1 Reporter: Takayoshi Kimura Assignee: Takayoshi Kimura Fix For: 3.4.7, 3.5.2, 3.6.1 Attachments: FD_HOSTTest.java, test-fdhost.zip Currently FD_HOST PingTask has 2 loops, ping loop and cheking timeout loop. {code} for (h: hosts) { ping_and_update_timestamp(host) } current = System.currentTimeMillis(); for (h: hosts) { compare current and (ping_timestmp + timeout) } {code} Testing with large number of hosts, after lengthy Full GC during the ping loop, FD_HOST checks timeout and it counts the Full GC time in, sometimes causes many false suspects. For example, 1 min Full GC and 50 sec timeout, all hosts are suspected with current implementation. To reduce the impact of the Full GC time, we can combine the 2 loops into 1 loop, ping and checking timeout each host, so the Full GC delay only affects to a single host and never affect to other hosts.