Details
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Test
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Status: Open
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Major
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Resolution: Unresolved
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Description
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!