Customizing critical Hive configurations
As Administrator, you need property configuration guidelines. You need to know which properties you need to reconfigure after upgrading. You must understand which the upgrade process carries over from the old cluster to the new cluster.
The CDP upgrade process tries to preserve your Hive configuration property overrides. These
overrides are the custom values you set to configure Hive in the old CDH or HDP cluster. The
upgrade process does not perserve all overrides. For example, a custom value you set for
hive.exec.max.dynamic.partitions.pernode is preserved. In the case of other
properties, for example
hive.cbo.enable, the upgrade ignores any override and
just sets the CDP-recommended value.
The Apache Hive Wiki describes these properties. The values of these properties are lists.
The upgrade process ignores your old list and sets a new generic list. For example, the
hive.security.command.whitelist value is a list of security commands you consider trustworthy and want
to keep. Any overrides of this list that you set in the old cluster are not preserved. The
new default is probably a shorter (more restrictive) list than the original default you were
using in the old cluster. You need to customize this CDP to meet your needs.
Check and change each property listed above after upgrading as described in the next topic.
Consider reconfiguring more property values than the six listed above. Even if you did not override the default value in the old cluster, the CDP default might have changed in a way that impacts your work.