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new 9d2a115 [MINOR][DOC] Documentation on JVM options for SBT
9d2a115 is described below
commit 9d2a11554b0b2ac27bd506e6941ef8d339756db2
Author: Darcy Shen <sad...@zoho.com>
AuthorDate: Tue Jan 22 18:27:24 2019 -0600
[MINOR][DOC] Documentation on JVM options for SBT
## What changes were proposed in this pull request?
Documentation and .gitignore
## How was this patch tested?
Manual test that SBT honors the settings in .jvmopts if present
Closes #23615 from sadhen/impr/gitignore.
Authored-by: Darcy Shen <sad...@zoho.com>
Signed-off-by: Sean Owen <sean.o...@databricks.com>
---
.gitignore | 3 +++
docs/building-spark.md | 8 ++++++++
2 files changed, 11 insertions(+)
diff --git a/.gitignore b/.gitignore
index e4c44d0..d5cf66d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -94,3 +94,6 @@ spark-warehouse/
*.Rproj.*
.Rproj.user
+
+# For SBT
+.jvmopts
diff --git a/docs/building-spark.md b/docs/building-spark.md
index 55695f3..b16083f 100644
--- a/docs/building-spark.md
+++ b/docs/building-spark.md
@@ -138,6 +138,14 @@ To avoid the overhead of launching sbt each time you need
to re-compile, you can
in interactive mode by running `build/sbt`, and then run all build commands at
the command
prompt.
+### Setting up SBT's Memory Usage
+Configure the JVM options for SBT in `.jvmopts` at the project root, for
example:
+
+ -Xmx2g
+ -XX:ReservedCodeCacheSize=512m
+
+For the meanings of these two options, please carefully read the [Setting up
Maven's Memory Usage
section](http://spark.apache.org/docs/latest/building-spark.html#setting-up-mavens-memory-usage).
+
## Speeding up Compilation
Developers who compile Spark frequently may want to speed up compilation;
e.g., by using Zinc
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