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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-17421) Clear incorrect stats after replication
Date Thu, 31 Aug 2017 21:04:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-17421?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Dai reassigned HIVE-17421:
---------------------------------


> Clear incorrect stats after replication
> ---------------------------------------
>
>                 Key: HIVE-17421
>                 URL: https://issues.apache.org/jira/browse/HIVE-17421
>             Project: Hive
>          Issue Type: Bug
>          Components: repl
>            Reporter: Daniel Dai
>            Assignee: Daniel Dai
>
> After replication, some stats summary are incorrect. If hive.compute.query.using.stats
set to true, we will get wrong result on the destination side.
> This will not happen with bootstrap replication. This is because stats summary are in
table properties and will be replicated to the destination. However, in incremental replication,
this won't work. When creating table, the stats summary are empty (eg, numRows=0). Later when
we insert data, stats summary are updated with update_table_column_statistics/update_partition_column_statistics,
however, both events are not captured in incremental replication. Thus on the destination
side, we will get count(*)=0. The simple solution is to remove COLUMN_STATS_ACCURATE property
after incremental replication.



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