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https://issues.apache.org/jira/browse/HADOOP-4586?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Francesco Salbaroli updated HADOOP-4586:
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Attachment: jgroups-all.jar
HADOOP-4586-0.1.patch
This is a very preliminary (and tested only locally) release of Fault tolerant
Hadoop.
The hadoop source tree is only slightly modified in the
org.apache.hadoop.mapred.TaskTracker class.
The package containing the fault tolerance wrapper is
org.apache.hadoop.mapred.faulttolerant.
The JGroups library (jgroups-all.jar) must be copied in the lib/ folder.
To run the FT version of Hadoop:
1) Configure hadoop-site.xml to match the environment
2) Format the HDFS filesystem ($HADOOP_HOME/bin/namenode -format)
3) Run the HDFS daemons (to run locally $HADOOP_HOME/bin/start-dfs.sh)
4) Run one or more instances of FTJobTracker ($HADOOP_HOME/bin/hadoop
org.apache.hadoop.mapred.faulttolerant.FTJobTracker)
5) Run one or more instance of FTTaskTracker ($HADOOP_HOME/bin/hadoop
org.apache.hadoop.mapred.faulttolerant.FTTaskTracker)
Regards,
Francesco Salbaroli
> Fault tolerant Hadoop Job Tracker
> ---------------------------------
>
> Key: HADOOP-4586
> URL: https://issues.apache.org/jira/browse/HADOOP-4586
> Project: Hadoop Core
> Issue Type: New Feature
> Components: mapred
> Affects Versions: 0.18.0
> Environment: High availability enterprise system
> Reporter: Francesco Salbaroli
> Assignee: Francesco Salbaroli
> Attachments: FaultTolerantHadoop.pdf, HADOOP-4586-0.1.patch,
> jgroups-all.jar
>
> Original Estimate: 2016h
> Remaining Estimate: 2016h
>
> The Hadoop framework has been designed, in an eort to enhance perfor-
> mances, with a single JobTracker (master node). It's responsibilities varies
> from managing job submission process, compute the input splits, schedule
> the tasks to the slave nodes (TaskTrackers) and monitor their health.
> In some environments, like the IBM and Google's Internet-scale com-
> puting initiative, there is the need for high-availability, and performances
> becomes a secondary issue. In this environments, having a system with
> a Single Point of Failure (such as Hadoop's single JobTracker) is a major
> concern.
> My proposal is to provide a redundant version of Hadoop by adding
> support for multiple replicated JobTrackers. This design can be approached
> in many dierent ways.
> In the document at:
> http://sites.google.com/site/hadoopthesis/Home/FaultTolerantHadoop.pdf?attredirects=0
> I wrote an overview of the problem and some approaches to solve it.
> I post this to the community to gather feedback on the best way to proceed in
> my work.
> Thank you!
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