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https://issues.apache.org/jira/browse/SOLR-5325?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Christine Poerschke updated SOLR-5325:
--------------------------------------

    Attachment: SOLR-5325.patch

Attaching Overseer.java patch for solr 4.4.0, OverseerCollectionProcessor.java 
could be changed in similar way.

> zk connection loss causes overseer leader loss
> ----------------------------------------------
>
>                 Key: SOLR-5325
>                 URL: https://issues.apache.org/jira/browse/SOLR-5325
>             Project: Solr
>          Issue Type: Bug
>    Affects Versions: 4.3, 4.4
>            Reporter: Christine Poerschke
>         Attachments: SOLR-5325.patch
>
>
> The problem we saw was that when the solr overseer leader experienced 
> temporary zk connectivity problems it stopped processing overseer queue 
> events.
> This first happened when quorum within the external zk ensemble was lost due 
> to too many zookeepers being stopped (similar to SOLR-5199). The second time 
> it happened when there was a sufficient number of zookeepers but they were 
> holding zookeeper leadership elections and thus refused connections (the 
> elections were taking several seconds, we were using the default 
> zookeeper.cnxTimeout=5s value and it was hit for one ensemble member).



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