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HBase 0.96 + Eclipse + Maven

Since HBase-4336 (and HBase 0.96) the HBase source code has been split into multiple maven modules.
The post is no more related to a specific operating system, you can follow these steps on Linux or Windows.

0. Requirements

1. Checkout sources

Use your favorite Subversion client to checkout the HBase source code :

$ svn checkout hbase

 (check for more details)

2. Install M2Eclipse plugin

  • Select the menu : Help / "Install New Software"
  • In the 'Work with' field type : (press Enter)
  • Select m2e - Maven Integration for Eclipse

3. Import HBase source code

File - Import... - Maven / Existing Maven Projects and select the directory where sources have been checked out at step 1 :

Some java sources need to be generated, right click on  the hbase project, Run As and select "Maven generate-sources" :

4. Create Run configuration

 Create a new run configuration, name it 'HBase (start)', slect the hbase-server project and set org.apache.hadoop.hbase.master.HMaster as the main class :

In the Arguments  tab add the program arguments start :

Give it a try, click on the Run button :

You can also try the HBase web interface http://localhost:60010 :

5. Create HBase Shell Run configuration

Create a new Run configuration, set the Name to Shell, and select org.jruby.Main as the main class :
 In the Arguments tab :
  1. Add the path to the bin/hirb.rb file as the program argument
  2. Set the Java variable hbase.ruby.sources to the path src/main/ruby path (e.g. -Dhbase.ruby.sources=D:\HBASE\hbase-trunk\hbase-server\src\main\ruby)


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Update : please note that sinceHBase-4336 / HBase 0.96 the source tree is split in more than one Maven module this post is no more relevant, i have created a new post on this subject :
This is a simple setup in order to play with the source code of HBase under Microsoft Windows.
Since HBase use some Unix specific commands like chmod the only requirements here are Cygwin and a working Maven 3 environment. (It is obvious that you need Java and Eclipse, but you DON'T need anything else like the Eclipse Maven plugin or any SSH configuration)

1. Checkout the source code

The first step is to check out the source code from the Subversion repository. I did it under my cygwin home repository. In this example i want to play with the 0.90 branch :

svn co hbase-0.90

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Row Count : HBase Aggregation example

With the coprocessors HBase 0.92 introduces a new way to process data directly on a region server. As a user this is definitively a very exciting feature : now you can easily define your own distributed data services.

This post is not intended to help you how to define them (i highly recommend you to watch this presentation if you want to do so) but to quickly presents the new aggregation service shipped with HBase 0.92 that is built upon the endpoint coprocessor framework.

1. Enable AggregationClient coprocessor

You have two choices :

You can enable aggregation coprocessor on all your tables by adding the following lines to hbase-site.xml :
<property> <name>hbase.coprocessor.user.region.classes</name> <value>org.apache.hadoop.hbase.coprocessor.AggregateImplementation</value> </property> or can enable coprocessor only on a table throught the HBase shell :

1. disable the table
hbase> disable 'mytable'

2. add the coprocessor

Analyse d'un "thread dump" d'une JVM IBM sous AIX

Dans quels cas le thread dump est utile ?
Le thread dump est un instantané de l'activité des threads de la JVM. Leur analyse est intéressante dans les cas où l'activité de la JVM ne semble pas normale :
Activité suspendue (deadlock/interblocage) ou partiellement suspendue (starvation/famine)Activité existante mais le "débit" est en deçà de ce qui est attendu (Goulot d'étranglement / Bottleneck)Activité existante mais le "débit" reste nul (Boucle infinie / Infinite Loop)Comment avoir un thread dump ?
Nous nous limitons ici à la machine virtuel IBM sous AIX. Dans ce cas là il est extrêmement simple de déclencher la création d'un thread dump : il suffit de faire un kill -3 sur le processus Java.

Un fichier dont le nom est javacore.[date].[numero_processus].[compteur].txt est produit. Sur la sortie standard du processus vous devriez voir la ligne suivante s'afficher :
JVMDUMP010I Java Dump written to .....
En général le dump est produit dans le réper…