GitHub user hvanhovell opened a pull request:
https://github.com/apache/spark/pull/17433
[SPARK-20100][SQL] Refactor SessionState initialization
## What changes were proposed in this pull request?
The current SessionState initialization code path is quite complex. A part
of the creation is done in the SessionState companion objects, a part of the
creation is one inside the SessionState class, and a part is done by passing
functions.
This PR refactors this code path, and consolidates SessionState
initialization into a builder class. This SessionState will not do any
initialization and just becomes a place holder for the various Spark SQL
internals. This also lays the ground work for two future improvements:
1. This provides us with a start for removing the `HiveSessionState`.
Removing the `HiveSessionState` would also require us to move resource loading
into a separate class, and to (re)move metadata hive.
2. This makes it easier to customize the Spark Session. Currently you will
need to create a custom version of the builder. I have added hooks to
facilitate this. A future step will be to create a semi stable API on top of
this.
## How was this patch tested?
Existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hvanhovell/spark SPARK-20100
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17433.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #17433
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commit 711582f65192ea11c1fc09f7e2453fd9e41e8d3d
Author: Herman van Hovell <hvanhov...@databricks.com>
Date: 2017-03-26T09:48:25Z
Refactor SessionState initialization.
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