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https://issues.apache.org/jira/browse/IMPALA-12155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17730812#comment-17730812
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Li Penglin commented on IMPALA-12155:
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[~wzhou]
Excellent! It's a very important feature for very large cluster. Can you share
the design document, if you start.
Is the solution similar to the HDFS High Availability (HA) feature?
> Support Impala CatalogD HA
> --------------------------
>
> Key: IMPALA-12155
> URL: https://issues.apache.org/jira/browse/IMPALA-12155
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Reporter: Wenzhe Zhou
> Assignee: Wenzhe Zhou
> Priority: Critical
>
> To support catalog HA, we need to have two CatalogD in HA pair, and add the
> preemptive behavior for Catalogd. When CatalogD HA is enabled, the preemptive
> behavior allows the CatalogD with the higher priority to become active and
> the paired CatalogD becomes standby. The active CatalogD acts as the source
> of metadata and provides catalog service for the Impala cluster. When active
> CatalogD is not healthy, the standby CatalogD will take over catalog service.
> Preemption is disabled on the CatalogD when it is not running as HA pair.
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