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https://issues.apache.org/jira/browse/HDFS-2136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13065432#comment-13065432
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Eli Collins commented on HDFS-2136:
-----------------------------------
A technique Todd has used so far for 1073 is to have one of the NN mounts on
mdadm in "faulty" mode w/ injected read and write failures. Run continuously
this provides a lot of coverage. I also think mocking out the storage directory
is worth the effort because there are lots of scenarios this would allow us to
test, I don't think storage directories are that tightly coupled. An AOP test
is reasonable to try here as well.
> 1073: Fault injection for StorageDirectory failures during read/write of
> FSImage/Edits files
> --------------------------------------------------------------------------------------------
>
> Key: HDFS-2136
> URL: https://issues.apache.org/jira/browse/HDFS-2136
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Matt Foley
>
> Both HDFS-1955 and HDFS-2135 have observed that it is difficult to unit test
> such failures. As a result, regression of HDFS-1955 was only found by
> careful manual review (thanks, atm!). Since 1073 is making broad changes to
> the way these files are read and written, and appropriately putting effort
> into correct error handling, I propose we make also make it possible to
> auto-test that error handling.
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