Build instructions for BookKeeper

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Requirements:

* Unix System
* JDK 1.6
* Maven 3.0
* Autotools (if compiling native hedwig client)
* Internet connection for first build (to fetch all dependencies)

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The BookKeeper project contains:

 - bookkeeper-server     (BookKeeper server and client)
 - bookkeeper-benchmark  (Benchmark suite for testing BookKeeper performance)
 - hedwig-protocol       (Hedwig network protocol)
 - hedwig-client         (Hedwig client library)
 - hedwig-server         (Hedwig server)

BookKeeper is a system to reliably log streams of records. It is designed to 
store  write ahead logs, such as those found in database or database like 
applications.

Hedwig is a publish-subscribe system designed to carry large amounts of data 
across the internet in a guaranteed-delivery fashion from those who produce 
it (publishers) to those who are interested in it (subscribers).

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How do I build?

 BookKeeper uses maven as its build system. To build, run "mvn package" from the 
 top-level directory, or from within any of the submodules.

 Useful maven commands are:

 * Clean                     : mvn clean
 * Compile                   : mvn compile
 * Run tests                 : mvn test 
 * Create JAR                : mvn package
 * Run findbugs              : mvn compile findbugs:findbugs
 * Install JAR in M2 cache   : mvn install
 * Deploy JAR to Maven repo  : mvn deploy
 * Run Rat                   : mvn apache-rat:check
 * Build javadocs            : mvn compile javadoc:aggregate
 * Build distribution        : mvn package assembly:single

 Tests options:

 * Use -DskipTests to skip tests when running the following Maven goals:
    'package',  'install', 'deploy' or 'verify'
 * -Dtest=<TESTCLASSNAME>,<TESTCLASSNAME#METHODNAME>,....
 * -Dtest.exclude=<TESTCLASSNAME>
 * -Dtest.exclude.pattern=**/<TESTCLASSNAME1>.java,**/<TESTCLASSNAME2>.java

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How do I run the services?

 Running a Hedwig service requires a running BookKeeper service, which in turn
 requires a running ZooKeeper service (see http://zookeeper.apache.org). To 
 start a bookkeeper service quickly for testing, run:
   
   $ bookkeeper-server/bin/bookkeeper localbookie 10

 This will start a standalone, ZooKeeper instance and 10 BookKeeper bookies.
 Note that this is only useful for testing. Data is not persisted between runs.

 To start a real BookKeeper service, you must set up a ZooKeeper instance and
 run start a bookie on several machines. Modify bookkeeper-server/conf/bk_server.conf
 to point to your ZooKeeper instance. To start a bookie run:

   $ bookkeeper-server/bin/bookkeeper bookie

 Once you have at least 3 bookies runnings, you can start some Hedwig hubs. A 
 hub is a machines which is responsible for a set of topics in the pubsub 
 system. The service automatically distributes the topics among the hubs. 
 To start a hedwig hub:

   $ hedwig-server/bin/hedwig server

 You can get more help on using these commands by running:

   $ bookkeeper-server/bin/bookkeeper help
       and
   $ hedwig-server/bin/hedwig help