Thanks for your response Erick and Shawn.
We had automated the solr/zookeeper future upgrades using scripts. So for
any new version of solr/zookeeper we use those script.
While upgrading zookeeper we do stop it to install it as a service and then
apply the new distribution(which is currently 3.4.6) and restart. Content
of zoo_data is not deleted.
After that the solr configs are uploaded. In this process of zookeeper
upgrade solr nodes are not restarted.
After this upgrade process I have seen all the nodes active. There are
connection related exception in solr log for the time the zookeeper was
stopped.
Our indexer again uploads the configs to accommodate any possible changes
in schema or solrconfig which passes every time and then during reload of
collection we are getting following exception intermittently.
{"responseHeader":{"status":500,"QTime":180028},"error":{"msg":"reload the
collection time out:180s","trace":"org.apache.solr.common.SolrException:
reload the collection time out:180s\n\tat
org.apache.solr.handler.admin.CollectionsHandler.handleResponse(CollectionsHandler.java:237)\n\tat
org.apache.solr.handler.admin.CollectionsHandler.handleRequestBody(CollectionsHandler.java:168)\n\tat
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:143)\n\tat
org.apache.solr.servlet.HttpSolrCall.handleAdminRequest(HttpSolrCall.java:660)\n\tat
org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:431)\n\tat
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:227)\n\tat
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:196)\n\tat
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)\n\tat
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)\n\tat
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)\n\tat
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)\n\tat
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)\n\tat
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)\n\tat
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)\n\tat
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)\n\tat
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)\n\tat
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)\n\tat
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215)\n\tat
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110)\n\tat
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)\n\tat
org.eclipse.jetty.server.Server.handle(Server.java:497)\n\tat
org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310)\n\tat
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)\n\tat
org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540)\n\tat
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)\n\tat
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)\n\tat
java.lang.Thread.run(Thread.java:745)\n","code":500}}
Regards,
Modassar
On Mon, Jul 27, 2015 at 8:45 PM, Shawn Heisey <apa...@elyograg.org> wrote:
> On 7/27/2015 6:17 AM, Modassar Ather wrote:
> > Kindly help me understand following with respect to Solr version 5.2.1.
> >
> > 1. What happens to the solr cluster if the standalone external zookeeper
> is
> > stopped/restarted with some changes done in zoo_data during the restart?
> > E.g After restarting the zookeeper the solr configs are reloaded with
> > changes. Please note that solr cluster is not restarted.
> > 2. In what conditions of zookeeper restart the solr nodes are required to
> > be restarted?
>
> If zookeeper loses quorum, SolrCloud goes read-only. Updates won't be
> possible until zookeeper has quorum again. If zookeeper goes away
> completely, I think the result might be the same, but I do not know.
>
> For changes in zookeeper related to core configuration, simply reloading
> affected collections with the Collections API is enough. For more
> extensive changes, especially to things like the clusterstate,
> restarting all Solr nodes might be required. If you give us specifics
> about what you want to change, we can figure out exactly what actions
> are needed.
>
> Thanks,
> Shawn
>
>
