Hi Daniel, thank you very much for your reply.
However, my zkTimeout in solr.xml is 30s.
<cores adminPath="/admin/cores" defaultCoreName="doc"
host="${host:215.lead.index.com}" hostPort="${jetty.port:9090}"
hostContext="${hostContext:}"
zkClientTimeout="${zkClientTimeout:30000}"
leaderVoteWait="${leaderVoteWait:20000}">
.......
</cores>
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