GitHub user gengliangwang opened a pull request:
https://github.com/apache/spark/pull/23049
[SPARK-26076][Build] Revise ambiguous error message from load-spark-env.sh
## What changes were proposed in this pull request?
When I try to run scripts (e.g. `./sbin/start-history-server.sh -h` in
latest master, I got such error:
```
Presence of build for multiple Scala versions detected.
Either clean one of them or, export SPARK_SCALA_VERSION in spark-env.sh.
```
The error message is quite confusing and there is no `spark-env.sh` in our
code base.
As now with https://github.com/apache/spark/pull/22967, we can revise the
error message as following:
```
Presence of build for both scala versions(SCALA 2.11 and SCALA 2.12)
detected.
Either clean one of them or, export SPARK_SCALA_VERSION=2.12 in
load-spark-env.sh.
## How was this patch tested?
Manual test
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/gengliangwang/spark reviseEnvScript
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/23049.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 #23049
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commit bf94264a3e037e00a7b7111a677467de980071c9
Author: Gengliang Wang <gengliang.wang@...>
Date: 2018-11-15T15:43:44Z
fix
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