Believe I found the issue, it was caused a script when starting the zk
instance, it also cleared all the solr configuration data from zk, causing the
solr to stop working.
However, a new issue is coming:
When using static IPs for zookeeper ensemble, it works perfectly and SOLR can
reconnect to another live zookeeper. But, when use host name (dns name) as the
ensemble, it seems SOLR use the static IP from the host name and cache it
forever. So when doing the rolling updates to the zookeeper, SOLR eventually
died because couldn’t connect to the previous IP even though the same name is
pointing to the new IP.
Any suggestion?
Thanks
Sean
On 6/16/17, 3:34 PM, "Xie, Sean" <sean....@finra.org> wrote:
Solr is configured with the zookeeper ensemble as mentioned below.
I will provide logs in a later time.
From: Shawn Heisey <apa...@elyograg.org<mailto:apa...@elyograg.org>>
Date: Friday, Jun 16, 2017, 12:27 PM
To: solr-user@lucene.apache.org
<solr-user@lucene.apache.org<mailto:solr-user@lucene.apache.org>>
Subject: [EXTERNAL] Re: Live update the zookeeper for SOLR
On 6/16/2017 9:05 AM, Xie, Sean wrote:
> Is there a way to keep SOLR alive when zookeeper instances (3 instance
> ensemble) are rolling updated one at a time? It seems SOLR cluster use
> one of the zookeeper instance and when the communication is broken in
> between, it won’t be able to reconnect to another zookeeper instance
> and keep itself alive. A service restart is need in this situation.
> Any way to keep the service alive all the time?
Have you informed Solr about all three of the ZK hosts? You need a
zkHost like this, with an optional chroot:
zkHost="server1.example.com:2181,server2.example.com:2181,server3.example.com:2181/chroot"
There are more zkHost examples and a better description of the string
format in this javadoc:
https://lucene.apache.org/solr/6_6_0/solr-solrj/org/apache/solr/client/solrj/impl/CloudSolrClient.html#CloudSolrClient-java.lang.String-
If Solr hasn't been explicitly informed about all the hosts in the
ensemble, then it cannot connect to surviving hosts.
I've never heard of the problem you described happening as long as
Zookeeper quorum is maintained and Solr is properly configured.
If you can show that a correctly configured Solr 6.6 server loses
connection to ZK when one of the ZK servers is taken down, that's a bug,
and we need an issue in Jira with documentation of the problem.
Thanks,
Shawn
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