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Posted to dev@lucene.apache.org by "Mark Miller (JIRA)" <ji...@apache.org> on 2016/02/23 16:39:18 UTC
[jira] [Updated] (SOLR-8696) Start the Overseer before actions that
need the overseer when reconnecting after zk expiration and improve
reconnect logic.
[ https://issues.apache.org/jira/browse/SOLR-8696?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mark Miller updated SOLR-8696:
------------------------------
Summary: Start the Overseer before actions that need the overseer when reconnecting after zk expiration and improve reconnect logic. (was: Start the Overseer before actions that need the overseer when reconnecting after zk expiration.)
> Start the Overseer before actions that need the overseer when reconnecting after zk expiration and improve reconnect logic.
> ---------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-8696
> URL: https://issues.apache.org/jira/browse/SOLR-8696
> Project: Solr
> Issue Type: Improvement
> Components: SolrCloud
> Affects Versions: 5.4.1
> Reporter: Scott Blum
> Assignee: Mark Miller
> Labels: patch, performance, solrcloud, startup
> Attachments: SOLR-8696.patch
>
>
> ZkController.publishAndWaitForDownStates() occurs before overseer election. That means if there is currently no overseer, there is ironically no one to actually service the down state changes it's waiting on. This particularly affects a single-node cluster such as you might run locally for development.
> Additionally, we're doing an unnecessary ZkStateReader forced refresh on all Overseer operations. This isn't necessary because ZkStateReader keeps itself up to date.
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