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From "Mark Miller (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SOLR-5325) zk connection loss causes overseer leader loss
Date Fri, 11 Oct 2013 03:57:21 GMT

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

Mark Miller updated SOLR-5325:
------------------------------

    Attachment: SOLR-5325.patch

Quick first pass patch.

> 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, 4.5
>            Reporter: Christine Poerschke
>            Assignee: Mark Miller
>             Fix For: 4.5.1, 4.6, 5.0
>
>         Attachments: SOLR-5325.patch, 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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