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https://issues.apache.org/jira/browse/IMPALA-12468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17825485#comment-17825485
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Quanlong Huang commented on IMPALA-12468:
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This will also be helpful in end-to-end tests of EP. We usually want some
events to be processed in a batch. In the test, we can stop EP before
generating those events, and resume EP after it.
CC [~VenuReddy], [~hemanth619]
> Add the ability to update EventProcessorStatus
> ----------------------------------------------
>
> Key: IMPALA-12468
> URL: https://issues.apache.org/jira/browse/IMPALA-12468
> Project: IMPALA
> Issue Type: Improvement
> Components: be, Catalog, fe
> Reporter: Maxwell Guo
> Assignee: Maxwell Guo
> Priority: Minor
>
> Once the impala and hive's status is missmatched , and the
> EventProcessorStatus become NEED_INVALIDATEļ¼ we usually use invalidate
> metadata to reset the catalog instance. And then impala will update the
> status to ACTIVE .
> But if impala contains many tables , the cost of invalidate is a bit high for
> a global invalidate. So we may invalidate metadata for tables one by one for
> these incremental changed table. For example , we have 1000,000,000,000
> tables but only some of the table event process occurs CatalogException and
> MetastoreNotificationNeedsInvalidateException was thrown. I think there is no
> need to invalidate all table caches in order to reset the catalog instance
> see [here
> |https://github.com/apache/impala/blob/master/fe/src/main/java/org/apache/impala/catalog/CatalogServiceCatalog.java#L2088].
>
> MetaStoresProcessor 's async update process will not update the currentStatus
> when the status is not ACTIVE, see
> [here|https://github.com/apache/impala/blob/master/fe/src/main/java/org/apache/impala/catalog/events/MetastoreEventsProcessor.java#L876]
> So what about add a new SQL grammar : SET EVENT STATUS ${status} ?
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