From 091c2c3ecd69803d78c2b15a1487046701059d38 Mon Sep 17 00:00:00 2001
From: Kay Ousterhout <kayousterhout@gmail.com>
Date: Mon, 12 Oct 2015 14:23:29 -0700
Subject: [PATCH] [SPARK-11056] Improve documentation of SBT build.
This commit improves the documentation around building Spark to
(1) recommend using SBT interactive mode to avoid the overhead of
launching SBT and (2) refer to the wiki page that documents using
SPARK_PREPEND_CLASSES to avoid creating the assembly jar for each
compile.
cc srowen
Author: Kay Ousterhout <kayousterhout@gmail.com>
Closes #9068 from kayousterhout/SPARK-11056.
---
docs/building-spark.md | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/docs/building-spark.md b/docs/building-spark.md
index 4d929ee10a..743643cbcc 100644
--- a/docs/building-spark.md
+++ b/docs/building-spark.md
@@ -216,6 +216,11 @@ can be set to control the SBT build. For example:
build/sbt -Pyarn -Phadoop-2.3 assembly
+To avoid the overhead of launching sbt each time you need to re-compile, you can launch sbt
+in interactive mode by running `build/sbt`, and then run all build commands at the command
+prompt. For more recommendations on reducing build time, refer to the
+[wiki page](https://cwiki.apache.org/confluence/display/SPARK/Useful+Developer+Tools#UsefulDeveloperTools-ReducingBuildTimes).
+
# Testing with SBT
Some of the tests require Spark to be packaged first, so always run `build/sbt assembly` the first time. The following is an example of a correct (build, test) sequence:
--
GitLab