For how long you noticed that connections? when you say "many" do you mean 1000s? the problem with having too many syn_recv is that you could end running out of file descriptors, which makes me wonder know what is the maximum number of open files that you have configured for the RS process (see all the root->hbase user->hbase proc chain of ulimits) and if there could be a rogue client connecting to 60020 (maybe a port scanner?) and triggering that problem.
cheers, esteban. -- Cloudera, Inc. On Fri, Jul 11, 2014 at 3:02 AM, Rural Hunter <[email protected]> wrote: > One additional info, I did 'netstat -an |grep 60020' when the problem > happened, I saw many connections from remote to local port 60020 are on > state "SYN_RECV". Not sure if that indicates anything. >
