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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-8666) Add header to SearchHandler to indicate whether solr is connection to zk
Date Wed, 06 Apr 2016 00:07:25 GMT

    [ https://issues.apache.org/jira/browse/SOLR-8666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15227408#comment-15227408
] 

Hoss Man commented on SOLR-8666:
--------------------------------

I added an explanation of this to the ref guide, i would appreciate if folks more intimately
familiar with the issue would review & sanity check ... comment on the page as needed...

https://cwiki.apache.org/confluence/display/solr/Read+and+Write+Side+Fault+Tolerance

> Add header to SearchHandler to indicate whether solr is connection to zk
> ------------------------------------------------------------------------
>
>                 Key: SOLR-8666
>                 URL: https://issues.apache.org/jira/browse/SOLR-8666
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Keith Laban
>            Assignee: Dennis Gove
>             Fix For: master
>
>         Attachments: SOLR-8666.patch
>
>
> Currently solr update requests error out if a zookeeper check fails, however SearchHandler
does not do these checks. As a result, if a request is sent to a node which should be part
of a SolrCloud but is not connected to zookeeper and thinks that its Active, it's possible
the response is composed of stale data. 
> The purpose of this header is to allow the client to decide whether or not the result
data should be considered valid.
> This patch also returns the {{zkConnected}} header in the ping handler to allow external
health checks to use this information. 
> See [SOLR-8599] for an example of when this situation can arise. 



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