You must dump the Hive metastore metadata immediately before upgrading. Dumping the
metastore data to a file is critical to prevent data loss.
-
On the node where the database you use for Hive Metastore resides, dump Hive
Metastore metadata before upgrading to HDP.
For example, in MySQL, dump each database as
follows:
mysqldump <hive_db_schema_name> > </path/to/dump_file>
In Postgres, dump each database as follows:
pg_dump --opt <metastore_db_name> > /path/to/dump_file
-
Proceed to upgrade HDP, assuming no Hive update, delete, or merge occurred
after compaction; otherwise, repeat the compaction and Hive Metastore dump
procedures, and then upgrade HDP.
