[SOLR-12585] Solr fails even ZK quorum has majority

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 6.6.2
• Component/s: Server, SolrCloud
• Assignee: Unassigned
• Reporter: Susheel Kumar
• Created: 24/Jul/18 12:33
• Updated: 08/Jun/19 15:03

Description

Solr fails to function when one of ZK quorum node gets inaccessible due to DNS issue. E.g. below we had running Solr Cloud cluster and when one of the node went inaccessible due to DNS issue, Solr stops functioning even though the other 2 ZK machines were up and had a majority. 

 

See mailing list for more details

http://lucene.472066.n3.nabble.com/Solr-fails-even-ZK-quorum-has-majority-td4399166.html 

 

e.g.

ping ditsearch001.es.com                         

ping: cannot resolve ditsearch001.es.com: Unknown host

 

Caused by: org.apache.solr.common.SolrException: 
java.net.UnknownHostException: ditsearch001.es.com: Name or service not 
known 

        at 
org.apache.solr.common.cloud.SolrZkClient.<init>(SolrZkClient.java:171) 

        at 
org.apache.solr.common.cloud.SolrZkClient.<init>(SolrZkClient.java:117) 

        at 
org.apache.solr.common.cloud.SolrZkClient.<init>(SolrZkClient.java:112) 

        at 
org.apache.solr.common.cloud.SolrZkClient.<init>(SolrZkClient.java:99) 

        at