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https://issues.apache.org/jira/browse/HIVE-20998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16718102#comment-16718102
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Ashutosh Chauhan commented on HIVE-20998:
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+1
> HiveStrictManagedMigration utility should update DB/Table location as last
> migration steps
> ------------------------------------------------------------------------------------------
>
> Key: HIVE-20998
> URL: https://issues.apache.org/jira/browse/HIVE-20998
> Project: Hive
> Issue Type: Sub-task
> Reporter: Jason Dere
> Assignee: Jason Dere
> Priority: Major
> Attachments: HIVE-20998.1.patch
>
>
> When processing a database or table, the HiveStrictManagedMigration utility
> currently changes the database/table locations as the first step in
> processing that database/table. Unfortunately if an error occurs while
> processing this database or table, then there may still be migration work
> that needs to continue for that db/table by running the migration again.
> However the migration tool only processes dbs/tables that have the old
> warehouse location, then the tool will skip over the db/table when the
> migration is run again.
> One fix here is to set the new location as the last step after all of the
> migration work is done:
> - The new table location will not be set until all of its partitions have
> been successfully migrated.
> - The new database location will not be set until all of its tables have
> been successfully migrated.
> For existing migrations that failed with an error, the following workaround
> can be done so that the db/tables can be re-processed by the migration tool:
> 1) Use the migration tool logs to find which databases/tables failed during
> processing.
> 2) For each db/table, change location of of the database and table back to
> old location:
> ALTER DATABASE tpcds_bin_partitioned_orc_10 SET LOCATION
> 'hdfs://ns1/apps/hive/warehouse/tpcds_bin_partitioned_orc_10.db';
> ALTER TABLE tpcds_bin_partitioned_orc_10.store_sales SET LOCATION
> 'hdfs://ns1/apps/hive/warehouse/tpcds_bin_partitioned_orc_10.db/store_sales';
> 2) Rerun the migration tool
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