dengke created KUDU-3326:
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Summary: Add Soft Delete Table Supports
Key: KUDU-3326
URL: https://issues.apache.org/jira/browse/KUDU-3326
Project: Kudu
Issue Type: New Feature
Components: api, CLI, client, master, test
Reporter: dengke
h2. Brief description：
Soft delete means that the kudu system will not delete the table
immediately after receiving the command to delete the table. Instead, it will
mark the table and set a validity period. After the validity period, will try
again to determine whether the table really needs to be deleted.
This feature can restore data conveniently and timely in the case of
accidental deletion.
h2. Relevant modification points：
1. After deleting a table, the original table name will be renamed as
KUDU_TRASHED: < timestamp >: < original table name >, which becomes a trash
table.
2. The contents of the trash table are exactly the same as those of the
original table. Although it cannot be renamed, added or deleted directly, it
can be read and written normally. The trash table will be retained for a period
of time by default (such as 7 days, which can be modified through parameters).
The compact priority of the trash table will be set to the lowest to save the
system resources.
3. The master needs to add a thread to process expired trash tables and perform
real deletion.
4. It is allowed to create a table with the same name as the original table,
and the newly created table with the same name can be deleted normally.
5. It is allowed to recall deleted tables, but the following two situations
cannot be recalled： * the same original table name exists.
* the trash table has expired .
6. The KUDU_TRASHED is a reserved string for the system. Users are not allowed
to create a table with table names starting with KUDU_TRASHED.
7. Kudu tool adaptation soft deletion.
8. Java API adaptation soft deletion.
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