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From "Konstantin Boudnik (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-6003) AspectJ framework for HDFS code and tests
Date Tue, 09 Jun 2009 20:11:07 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-6003?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Konstantin Boudnik updated HADOOP-6003:

        Fix Version/s: 0.21.0
    Affects Version/s: 0.20.0
               Status: Patch Available  (was: Open)

This patch includes the  following additions:
- AspectJ framework (version 1.6.4) is added to the Ivy resolver's configuration
- the implementation of a simple probability calculation and configuration needed by fault
- two aspects for datanode's classes BlockReceiver and FSDataset are created and tested

It is expected to see unit tests failing with faults in place. We might need to develop different
kind of tests to utilize fault injection in a better way.

The interface of the new framework is as follows:
- ant injectfaults will weave the aspects in place after the normal compilation of HDFS classes
is complete
- ant run-test-hdfs will execute unit tests as usual, but faults will be injected according
to the rules
- ant jar will create Hadoop's jar as usual, but if 'injectfaults' has been executed before
then the jar file will include instrumented classes, e.g. with fault invocations

The rules of faults injection probability calculation are as follows:
* default probability level is set to 0. Thus even with aspects weaved into the classes faults
won't be injected/executed unless specified explicitly
* to set certain class' faults probability level one needs to specify system property in the
following format
  ant run-test-hdfs -Dfault.probability.FSDataset=3 
which will probability of faults injections into FSDataset class at about 3%     

> AspectJ framework for HDFS code and tests
> -----------------------------------------
>                 Key: HADOOP-6003
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6003
>             Project: Hadoop Core
>          Issue Type: Sub-task
>    Affects Versions: 0.20.0
>            Reporter: Konstantin Boudnik
>            Assignee: Konstantin Boudnik
>             Fix For: 0.21.0
>         Attachments: HADOOP-6003.patch, HADOOP-6003.sh
> This subtask takes care about HDFS part of Hadoop only. Others will be added later as
needed: it will include only new aspects development and modifications of build.xml file

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