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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Work logged] (HIVE-20968) Support conversion of managed to external where location set was not owned by hive
Date Tue, 09 Apr 2019 11:26:00 GMT


ASF GitHub Bot logged work on HIVE-20968:

                Author: ASF GitHub Bot
            Created on: 09/Apr/19 11:25
            Start Date: 09/Apr/19 11:25
    Worklog Time Spent: 10m 
      Work Description: maheshk114 commented on pull request #588: HIVE-20968 : Support conversion
of managed to external where location set was not owned by hive

 File path: standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/events/
 @@ -40,6 +42,11 @@ public AlterTableEvent (Table oldTable, Table newTable, boolean isTruncateOp,
     this.newTable = newTable;
     this.isTruncateOp = isTruncateOp;
     this.writeId = writeId;
+    if (newTable.getSd() == null) {
 Review comment:
   not sure ..if the location is not changed ..then it make sense to keep it null avoid
extra data to be written to meta store db 
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Issue Time Tracking

    Worklog Id:     (was: 224919)
    Time Spent: 1h 50m  (was: 1h 40m)

> Support conversion of managed to external where location set was not owned by hive
> ----------------------------------------------------------------------------------
>                 Key: HIVE-20968
>                 URL:
>             Project: Hive
>          Issue Type: Sub-task
>          Components: repl
>    Affects Versions: 4.0.0
>            Reporter: mahesh kumar behera
>            Assignee: mahesh kumar behera
>            Priority: Major
>              Labels: DR, pull-request-available
>         Attachments: HIVE-20968.01.patch
>          Time Spent: 1h 50m
>  Remaining Estimate: 0h
> As per migration rule, if a location is outside the default managed table directory and
the location is not owned by "hive" user, then it should be converted to external table after
>  So, the same rule is applicable for Hive replication where the data of source managed
table is residing outside the default warehouse directory and is not owned by "hive" user.
>  During this conversion, the path should be preserved in target as well so that failover
works seamlessly.
>  # If the table location is out side hive warehouse and is not owned by hive, then the
table at target will be converted to external table. But the location can not be retained
, it will be retained relative to hive external warehouse directory. 
>  #  As the table is not an external table at source, only those data which are added
using events will be replicated.
>  # The ownership of the location will be stored in the create table event and will be
used to compare it with strict.managed.tables.migration.owner to decide if the flag in replication
scope can be set. This flag is used to convert the managed table to external table at target.
> Some of the scenarios needs to be blocked if the database is set for replication from
a cluster with non strict managed table setting to strict managed table.
> 1. Block alter table / partition set location for database with source of replication
set for managed tables
> 2. If user manually changes the ownership of the location, hive replication may go to
a non recoverable state.
> 3. Block add partition if the location ownership is different than table location for
managed tables.
> 4. User needs to set strict.managed.tables.migration.owner along with dump command (default
to hive user). This value will be used during dump to decide the ownership which will be used
during load to decide the table type. The location owner information can be stored in the
events during create table. The flag can be stored in replication spec. Check other such configs
used in upgrade tool.
> 5. Replication flow also set additional parameter "external.table.purge"="true" ..only
for migration to external table
> 6. Block conversion from managed to external and vice versa. Pass some flag in upgrade
flow to allow this conversion during upgrade flow.

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