Hi, i'm Xin Luo The closeSessionTxn contains all the paths corresponding to the session when the zookeeper.closeSessionTxn.enabled is true. If a session creates too many ephemeral Znode, there will be an "Unreasonable Length" exception in the follower receiving the big closeSessionTxn from leader which will cause an disconnection between follower and leader, sometimes, the leader will continually crash for unable to load the big closeSessionTxn from disk, the only way to recover is increasing the jute.maxbuffer or zookeeper.jute.maxbuffer.extrasize, but it doesn't seem reasonable.