tree 3730e1332ea5c75a57af47db07f27294ddacc697
parent 0119a19c93d0607ecfda2c5e029169e689c2bfd0
author wankunde <wankunde@163.com> 1572616588 +0800
committer William Guo <guoyp@apache.org> 1572616588 +0800

[GRIFFIN-295] Limit the memory used by test case

The container memory size is 3G in travis, but out test cases always uses more than 3G memory, so `Cannot allocate memory` will be thrown.

```
Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000fe980000, 23592960, 0) failed; error='Cannot allocate memory' (errno=12)
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 23592960 bytes for committing reserved memory.
# An error report file with more information is saved as:
# /home/travis/build/apache/griffin/measure/hs_err_pid11948.log
# [ timer expired, abort... ]
```

There are two kind of programs in our tests, the maven main program and the tests run by maven-surefire-plugin and scalatest-maven-plugin.
If the memory is unlimited, test cases will occupy as much memory as possible  especially spark jobs.

Spark jobs will not free the memory until a full GC occurs , even if we have stopped the spark context .so we need to limit the momery used by test cases.

We can limit the maven memory used by set export MAVEN_OPTS=" -Xmx1024m -XX:ReservedCodeCacheSize=128m" , and we can limit the memory used by spark job tests by configuring the maven-surefire-plugin and scalatest-maven-plugin.

For example:
Before we limit the memory used, maven program occupy 1.5G memory and spark job occupy 1.8G memory.
<img width="1153" alt="1" src="https://user-images.githubusercontent.com/3626747/67956554-40108e00-fc2f-11e9-83de-d0840fb42cb7.png">
<img width="1150" alt="2" src="https://user-images.githubusercontent.com/3626747/67956567-46066f00-fc2f-11e9-8a73-6d141be28e70.png">

After we limit the memory used, maven program occupy 1G memory and spark job occupy 1G memory.
<img width="1142" alt="3" src="https://user-images.githubusercontent.com/3626747/67956579-4999f600-fc2f-11e9-9cd4-9032966ca923.png">
<img width="1139" alt="4" src="https://user-images.githubusercontent.com/3626747/67956586-4dc61380-fc2f-11e9-800b-1d26d637a479.png">

Author: wankunde <wankunde@163.com>

Closes #546 from wankunde/testcase_memory_limit.