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https://issues.apache.org/jira/browse/IMPALA-12060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17719117#comment-17719117
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Zhi Tang commented on IMPALA-12060:
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Hi, Wenzhe! It seems that we have already worked on catalog's HA. I want to
learn more about it, but I haven't found any more useful information. If you
could share some details with me, such as the HA implementation document for
the catalog, I would greatly appreciate it.
> statestore should only allow a single catalog instance to be part of cluster
> ----------------------------------------------------------------------------
>
> Key: IMPALA-12060
> URL: https://issues.apache.org/jira/browse/IMPALA-12060
> Project: IMPALA
> Issue Type: Bug
> Reporter: Abhishek Rawat
> Assignee: Wenzhe Zhou
> Priority: Critical
>
> Today Impala doesn't support multiple catalogd instances to be part of the
> cluster. When using external Active Passive HA mechanisms like leader
> election, it may be possible for multiple catalog replicas to be part of the
> cluster, in some cases. This is mainly because catalogds have no idea that
> there are other catalogd instances. One way to address this issue could be
> for statestore to always ensure that there could only be a single instance of
> catalogd in the cluster. Coordinator also has a config `catalog_service_host`
> - both statestore and coordinator should have a consistent view and consider
> the proper catalogd instance to be part of the cluster.
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