thx for your reply.
my solr.xml is like this:
i have change the zkclienttimeout from 15s to 30s, but this exception still
shows.
and the load on solrcloud servers are not too heavy, they are 1.4 1.5 1.
and these disconnects appear in solrj logs, while the solrcloud is
Check the Solr logs for Zookeeper disconnects. It could be that as load is
increasing Solr is not able to respond to the Zookeeper pings which would
bring the nodes offline. If you see Zookeeper disconnects then you can
increase the zkClientTimeout set in solr.xml. But be aware that zk
disconnects
