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https://issues.apache.org/jira/browse/HIVE-18661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16720669#comment-16720669
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Daniel Dai commented on HIVE-18661:
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Sorry need to take back, DDL are not usually in an open transaction, they will
potentially read old content. For example, you alter a table, then periodical
update overwrite with old image, then you do a describe, since there's no
commit transaction, and there's no open transaction, you will read old image.
Is that right?
> CachedStore: Use metastore notification log events to update cache
> ------------------------------------------------------------------
>
> Key: HIVE-18661
> URL: https://issues.apache.org/jira/browse/HIVE-18661
> Project: Hive
> Issue Type: Sub-task
> Components: Metastore
> Reporter: Vaibhav Gumashta
> Assignee: mahesh kumar behera
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-18661.02.patch, HIVE-18661.03.patch,
> HIVE-18661.04.patch, HIVE-18661.05.patch, HIVE-18661.06.patch,
> HIVE-18661.07.patch, HIVE-18661.08.patch
>
>
> Currently, a background thread updates the entire cache which is pretty
> inefficient. We capture the updates to metadata in NOTIFICATION_LOG table
> which is getting used in the Replication work. We should have the background
> thread apply these notifications to incrementally update the cache.
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