### What is this PR for?
This PR sets default value for ZEPPELIN_INTP_MEM to avoid OOM Exception in SparkInterpreter when Zeppelin has zero configuration. This PR should be merged to both branch-0.6 and master.
### What type of PR is it?
Bug Fix
### How should this be tested?
1. Build with:
```
mvn clean package -DskipTests -pl '!zeppelin-distribution,!file,!alluxio,!livy,!hbase,!bigquery,!python,!jdbc,!ignite,!lens,!postgresql,!cassandra,!kylin,!elasticsearch,!flink,!markdown,!shell,!angular'
```
2. Unset SPARK_HOME in conf/zeppelin-env.sh if you have.
3. Run Zeppelin with java 1.7.
4. Run tutorial and see if it doesn't hang.
### Questions:
* Does the licenses files need update? no
* Is there breaking changes for older versions? no
* Does this needs documentation? no
Author: Mina Lee <minalee@apache.org>
Closes#1505 from minahlee/hotfix/default_intp_jvm and squashes the following commits:
0dfda4f [Mina Lee] Set default ZEPPELIN_INTP_MEM
### What is this PR for?
Don't use ZEPPELIN_JAVA_OPTS as the default value of ZEPPELIN_INTP_JAVA_OPTS
### What type of PR is it?
Improvement
### What is the Jira issue?
https://issues.apache.org/jira/browse/ZEPPELIN-1185
### How should this be tested?
Tested manually. By exporting the following variable, I can debug zeppelin server correctly and remote interpreter process can ran successfully. (Before this PR, the remote interpreter process will fail to launch because it would also listen the same debug port)
```
export ZEPPELIN_JAVA_OPTS="-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005"
```
Author: Jeff Zhang <zjffdu@apache.org>
Closes#1189 from zjffdu/ZEPPELIN-1185 and squashes the following commits:
9e48ad7 [Jeff Zhang] change for windows
3ff5561 [Jeff Zhang] update doc format
e82d889 [Jeff Zhang] add migration doc
ef5a360 [Jeff Zhang] ZEPPELIN-1185. ZEPPELIN_INTP_JAVA_OPTS should not use ZEPPELIN_JAVA_OPTS as default value
### What is this PR for?
This is to give Windows first-class support for running Zeppelin without the need for Cygwin or other hacks.
### What type of PR is it?
Improvement
### Todos
* [x] - Fix notebook dir path handling which right now assumes URI compatible string (see https://github.com/apache/incubator-zeppelin/blob/master/zeppelin-zengine/src/main/java/org/apache/zeppelin/notebook/repo/VFSNotebookRepo.java#L63)
* [x] - Add documentation for configuring and running on Windows
* [x] - Independent code review of the CMD scripts to ensure they're correct
### Is there a relevant Jira issue?
ZEPPELIN-647
### How should this be tested?
* Pull this PR
* Build
* Override default ZEPPELIN_NOTEBOOK_DIR in zeppelin-env.cmd to be an absolute file URI such as file:///c:/notebook
* Start with bin\zeppelin.cmd
* If using any Hadoop system ensure you have winutils.exe in your HADOOP_HOME\bin, see (https://github.com/steveloughran/winutils)
### Screenshots (if appropriate)
### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? Yes
Author: Silvio Fiorito <silvio.fiorito@granturing.com>
Author: Silvio Fiorito <Silvio Fiorito>
Closes#734 from granturing/windows-support and squashes the following commits:
8aadd45 [Silvio Fiorito] Fixes to handle spaces in paths properly, both for ZEPPELIN_HOME and CLASSPATH
73aaf4f [Silvio Fiorito] Default to the appropriate interpreter when running on Windows
db28fe9 [Silvio Fiorito] Support for running unit tests on Windows using the appropriate interpreter script
a1e3097 [Silvio Fiorito] Support for Windows CMD shell interpreter
82acdcf [Silvio Fiorito] Merge branch 'master' into windows-support
9e8b309 [Silvio Fiorito] Initital doc updates for running on Windows
03baf62 [Silvio Fiorito] Additional fix for embedded pyspark environment variables
2b9f01c [Silvio Fiorito] Fix for pyspark PYTHONPATH environment variable not being set properly due to delayed expansion
c700808 [Silvio Fiorito] Check for Windows path before creating URI to prevent URISyntaxExecption
d30e4b9 [Silvio Fiorito] And again fix indentations missed last time
5b49d3e [Silvio Fiorito] Cleaned up indentation
9e40482 [Silvio Fiorito] Initial support for Windows platform, startup scripts
