# Stop Thinking, Just Do!

Sung-Soo Kim's Blog

# Building Tachyon Master Branch

This guide describes how to compile Tachyon from the beginning.

The prerequisite for this guide is that you have Java 6 (or above), Maven, and Thrift 0.9.1 (Optional) installed.

Checkout the Tachyon master branch from Github and package:

$git clone git://github.com/amplab/tachyon.git$ cd tachyon
$mvn install  If you getting java.lang.OutOfMemoryError: Java heap space, please execute $ export MAVEN_OPTS="-Xmx2g -XX:MaxPermSize=512M -XX:ReservedCodeCacheSize=512m"


If you want to build a particular version of Tachyon, for example 0.7.1, please do git checkout v0.7.1 after cd tachyon.

The Maven build system fetches its dependencies, compiles, runs system’s unit tests, and package the system. If this is the first time you are building the project, it can take a while to download all the dependencies. Subsequent builds, however, will be much faster.

Once it is built, you can start Tachyon:

$cp conf/tachyon-env.sh.template conf/tachyon-env.sh$ ./bin/tachyon format
$./bin/tachyon-start.sh local  To verify that Tachyon is running, you can visit http://localhost:19999 or check the log in the folder tachyon/logs. You can also run a simple program: $ ./bin/tachyon runTest Basic CACHE_THROUGH


You should be able to see results similar to the following:

/Basic_File_CACHE_THROUGH has been removed
2014-02-02 09:32:02,760 INFO   (TachyonFS.java:connect) - Trying to connect master @ localhost/127.0.0.1:19998
2014-02-02 09:32:02,791 INFO   (MasterClient.java:getUserId) - User registered at the master localhost/127.0.0.1:19998 got UserId 10
2014-02-02 09:32:02,792 INFO   (TachyonFS.java:connect) - Trying to get local worker host : hy-ubuntu
2014-02-02 09:32:02,800 INFO   (TachyonFS.java:connect) - Connecting local worker @ hy-ubuntu/127.0.1.1:29998
2014-02-02 09:32:02,819 INFO   (CommonUtils.java:printTimeTakenMs) - createFile with fileId 18 took 60 ms.
2014-02-02 09:32:03,194 INFO   (TachyonFS.java:createAndGetUserTempFolder) - Folder /mnt/ramdisk/tachyonworker/users/10 was created!
2014-02-02 09:32:03,198 INFO   (BlockOutStream.java:<init>) - /mnt/ramdisk/tachyonworker/users/10/19327352832 was created!
Passed the test!


You can also stop the system by using:

$./bin/tachyon-stop.sh  # Unit tests To run all unit tests: $ mvn test


To run all the unit tests with under filesystem other than local filesystem:

$mvn test [ -Dhadoop.version=x.x.x ] [ -Dtest.profile=hdfs ]  Current supported profiles: local #default, uses local disk hdfs # uses hadoop's minicluster glusterfs # uses glusterfs  To have the logs output to STDOUT, append the following to the mvn command -Dtest.output.redirect=false -Dtachyon.root.logger=DEBUG,CONSOLE  # Distro Support To build master against one of the different distros of hadoop, you only need to change the hadoop.version. ## Apache All main builds are from Apache so all Apache releases can be used directly -Dhadoop.version=2.2.0 -Dhadoop.version=2.3.0 -Dhadoop.version=2.4.0  ## Cloudera To build against Cloudera’s releases, just use a version like $apacheRelease-cdh$cdhRelease -Dhadoop.version=2.3.0-cdh5.1.0 -Dhadoop.version=2.0.0-cdh4.7.0  ## MapR To build against a MapR release -Dhadoop.version=2.3.0-mapr-4.0.0-FCS  ## Pivotal To build against a Pivotal release, just use a version like $apacheRelease-gphd-$pivotalRelease -Dhadoop.version=2.0.5-alpha-gphd-2.1.1.0 -Dhadoop.version=2.2.0-gphd-3.0.1.0  ## Hortonworks To build against a Hortonworks release, just use a version like $apacheRelease.\$hortonRelease

-Dhadoop.version=2.1.0.2.0.5.0-67


# System Settings

Some times you will need to play with a few system settings in order to have the unit tests pass locally. A common setting that may need to be set is ulimit.

## Mac

In order to increase the number of files and procs allowed, run the following

bash
sudo launchctl limit maxfiles 16384 16384
sudo launchctl limit maxproc 2048 2048
sudo ulimit -n 16384 sudo ulimit -u 2048


It is also recommended to exclude your local clone of Tachyon from Spotlight indexing as otherwise your Mac may hang constantly trying to re-index the file system during the unit tests. To do this go to System Preferences > Spotlight > Privacy and click the + button, browse to the folder containing your local clone of Tachyon and click Choose to add it to the exclusions list.