[jira] [Resolved] (SOLR-15134) Solr upgrade order / documentation

["Bernd Wahlen (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-15134?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bernd Wahlen resolved SOLR-15134.
---------------------------------
    Fix Version/s: 8.8.1
       Resolution: Duplicate

> Solr upgrade order / documentation
> ----------------------------------
>
>                 Key: SOLR-15134
>                 URL: https://issues.apache.org/jira/browse/SOLR-15134
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>    Affects Versions: 8.8
>            Reporter: Bernd Wahlen
>            Priority: Major
>             Fix For: 8.8.1
>
>
> I updated a our solr cluster of 3 servers today 8.7 -> 8.8 and found the following difficulties:
> 1. solrj 8.7 was crashing when trying to connect to solr 8.8 with something like this:
> {code:java}
> Caused by: org.apache.solr.client.solrj.SolrServerException: java.lang.NullPointerException: Cannot invoke "String.endsWith(String)" because "baseUrl" is null
>         at org.apache.solr.client.solrj.impl.BaseCloudSolrClient.requestWithRetryOnStaleState(BaseCloudSolrClient.java:1053) ~[solr-solrj-8.7.0.jar:8.7.0 2dc63e901c60cda27ef3b744bc554f1481b3b067 - atrisharma - 2020-10-29 19:39:18]
> {code}
> After upgrade of solrj to 8.8 also, everything is fine.
> I mean this is more like a documentation issue. Most of the time solrj and solrj are compatible up- and down-version. 
> I read changes:
> https://lucene.apache.org/solr/8_8_0/changes/Changes.html#v8.8.0.bug_fixes
> *There should be some warning that client library must be upgraded before server.*
> => https://issues.apache.org/jira/browse/SOLR-15145
> 2. when updating servers in a rolling manner, after update of 1 server: only the 8.8 server is showing all 3 members of the cluster in the web interface. The 8.7 servers show nothing at all (not even the 2 remaining 8.7 instances). After upgrading all 3, everything recovered. Is the rolling-upgrade not working or is that, because i did it in the wrong order?



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