Solr Slave node poll blocked in Leader-Follower instructure

Hi All My Company use a leader-follower instructure to solve large index problem, instructure just like picture.1. And data update process such x...@wedoctor.com

Solr Slave nodes poll blocked in Leader-Follower instructure

by using Arthas, indexFetcher Thread Blocked in acquire iwLock's writeLock because of readLock not unclocked success, But I still can find the reason why readLock can't unlock. So I send this mail to ask for help! Thanks x...@wedoctor.com