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https://issues.apache.org/jira/browse/HADOOP-2483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12554088
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dhruba borthakur commented on HADOOP-2483:
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I would like an error-injection package for HDFS. It should be possible to
inject errors on disk subsystem and network subsystem. This would simulate disk
Io errors and network partitions, thereby triggering hard-to-test code paths in
HDFS.
> Large-scale reliability tests
> -----------------------------
>
> Key: HADOOP-2483
> URL: https://issues.apache.org/jira/browse/HADOOP-2483
> Project: Hadoop
> Issue Type: Test
> Components: test
> Reporter: Arun C Murthy
>
> The fact that we do not have any large-scale reliability tests bothers me.
> I'll be first to admit that it isn't the easiest of tasks, but I'd like to
> start a discussion around this... especially given that the code-base is
> growing to an extent that interactions due to small changes are very hard to
> predict.
> One of the simple scripts I run for every patch I work on does something very
> simple: run sort500 (or greater), then it randomly picks n tasktrackers from
> ${HADOOP_CONF_DIR}/conf/slaves and then kills them, a similar script one
> kills and restarts the tasktrackers.
> This helps in checking a fair number of reliability stories: lost
> tasktrackers, task-failures etc. Clearly this isn't good enough to cover
> everything, but a start.
> Lets discuss - What do we do for HDFS? We need more for Map-Reduce!
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