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https://issues.apache.org/jira/browse/SOLR-8599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15158473#comment-15158473
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Uwe Schindler commented on SOLR-8599:
-------------------------------------
In addition there is a bug in the test: It sets the "correct" server address in
another thread but there is no synchronization. This may work many times but
fails easily, especially on highly parallel CPU architectures! Making the
zkServerAddress volatile would be a fix, but as its for testing only, it is not
a good idea.
> Errors in construction of SolrZooKeeper cause Solr to go into an inconsistent
> state
> -----------------------------------------------------------------------------------
>
> Key: SOLR-8599
> URL: https://issues.apache.org/jira/browse/SOLR-8599
> Project: Solr
> Issue Type: Bug
> Components: SolrCloud
> Reporter: Keith Laban
> Assignee: Dennis Gove
> Attachments: SOLR-8599.patch, SOLR-8599.patch, SOLR-8599.patch
>
>
> We originally saw this happen due to a DNS exception (see stack trace below).
> Although any exception thrown in the constructor of SolrZooKeeper or the
> parent class, ZooKeeper, will cause DefaultConnectionStrategy to fail to
> update the zookeeper client. Once it gets into this state, it will not try to
> connect again until the process is restarted. The node itself will also
> respond successfully to query requests, but not to update requests.
> Two things should be address here:
> 1) Fix the error handling and issue some number of retries
> 2) If we are stuck in a state like this stop responding to all requests
> {code}
> 2016-01-23 13:49:20.222 ERROR ConnectionManager [main-EventThread] -
> :java.net.UnknownHostException: HOSTNAME: unknown error
> at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
> at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)
> at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)
> at java.net.InetAddress.getAllByName0(InetAddress.java:1276)
> at java.net.InetAddress.getAllByName(InetAddress.java:1192)
> at java.net.InetAddress.getAllByName(InetAddress.java:1126)
> at
> org.apache.zookeeper.client.StaticHostProvider.<init>(StaticHostProvider.java:61)
> at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:445)
> at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:380)
> at org.apache.solr.common.cloud.SolrZooKeeper.<init>(SolrZooKeeper.java:41)
> at
> org.apache.solr.common.cloud.DefaultConnectionStrategy.reconnect(DefaultConnectionStrategy.java:53)
> at
> org.apache.solr.common.cloud.ConnectionManager.process(ConnectionManager.java:132)
> at
> org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:522)
> at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:498)
> 2016-01-23 13:49:20.222 INFO ConnectionManager [main-EventThread] -
> Connected:false
> 2016-01-23 13:49:20.222 INFO ClientCnxn [main-EventThread] - EventThread shut
> down
> {code}
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