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Posted to issues@hive.apache.org by "Eugene Koifman (JIRA)" <ji...@apache.org> on 2018/03/01 23:44:00 UTC
[jira] [Updated] (HIVE-18814) Support Add Partition For Acid tables
[ https://issues.apache.org/jira/browse/HIVE-18814?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Eugene Koifman updated HIVE-18814:
----------------------------------
Description:
[https://cwiki.apache.org/confluence/display/Hive/LanguageManual%2BDDL#LanguageManualDDL-AddPartitions]
Add Partition command creates a {{Partition}} metadata object and sets the location to the directory containing data files.
In current master (Hive 3.0), Add partition on an acid table doesn't fail and at read time the data is decorated with row__id but the original transaction is 0. I suspect in earlier Hive versions this will throw or return no data.
One option is follow Load Data approach and create a new delta_x_x/ and move/copy the data there.
Another is to allocate a new writeid and save it in Partition metadata. This could then be used to decorate data with ROW__IDs. This avoids move/copy but retains data "outside" of the table tree which make it more likely that this data will be modified in some way which can really break things if done after and SQL update/delete on this data have happened.
It performs no validations on add (except for partition spec) so any file with any format can be added. It allows add to bucketed tables as well.
Seems like a very dangerous command. Maybe a better option is to block it and advise using Load Data. Alternatively, make this do Add partition metadata op followed by Load Data.
was:
[https://cwiki.apache.org/confluence/display/Hive/LanguageManual%2BDDL#LanguageManualDDL-AddPartitions]
Add Partition command creates a \{{Partition}} metadata object and set the location to the directory containing data files.
In current master (Hive 3.0), Add partition on an acid table doesn't fail and at read time the data is decorated with row__id but the original transaction is 0. I suspect in earlier Hive versions this will throw or return no data.
One option is follow Load Data approach and create a new delta_x_x/ and move/copy the data there.
Another is to allocate a new writeid and save it in Partition metadata. This could then be used to decorate data with ROW__IDs. This avoids move/copy but retains data "outside" of the table tree which make it more likely that this data will be modified in some way which can really break things if done after and SQL update/delete on this data have happened.
> Support Add Partition For Acid tables
> -------------------------------------
>
> Key: HIVE-18814
> URL: https://issues.apache.org/jira/browse/HIVE-18814
> Project: Hive
> Issue Type: New Feature
> Components: Transactions
> Reporter: Eugene Koifman
> Assignee: Eugene Koifman
> Priority: Major
>
> [https://cwiki.apache.org/confluence/display/Hive/LanguageManual%2BDDL#LanguageManualDDL-AddPartitions]
> Add Partition command creates a {{Partition}} metadata object and sets the location to the directory containing data files.
> In current master (Hive 3.0), Add partition on an acid table doesn't fail and at read time the data is decorated with row__id but the original transaction is 0. I suspect in earlier Hive versions this will throw or return no data.
>
> One option is follow Load Data approach and create a new delta_x_x/ and move/copy the data there.
>
> Another is to allocate a new writeid and save it in Partition metadata. This could then be used to decorate data with ROW__IDs. This avoids move/copy but retains data "outside" of the table tree which make it more likely that this data will be modified in some way which can really break things if done after and SQL update/delete on this data have happened.
>
> It performs no validations on add (except for partition spec) so any file with any format can be added. It allows add to bucketed tables as well.
> Seems like a very dangerous command. Maybe a better option is to block it and advise using Load Data. Alternatively, make this do Add partition metadata op followed by Load Data.
>
>
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