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From "Keith Laban (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SOLR-8599) Errors in construction of SolrZooKeeper cause Solr to into inconsistent state
Date Tue, 26 Jan 2016 16:09:39 GMT
Keith Laban created SOLR-8599:
---------------------------------

             Summary: Errors in construction of SolrZooKeeper cause  Solr to into inconsistent
state
                 Key: SOLR-8599
                 URL: https://issues.apache.org/jira/browse/SOLR-8599
             Project: Solr
          Issue Type: Bug
          Components: SolrCloud
            Reporter: Keith Laban


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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