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https://issues.apache.org/jira/browse/HADOOP-1989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12541131
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Konstantin Shvachko commented on HADOOP-1989:
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- DataNode.java
-# warning: import java.lang.reflect.Constructor;
-# throw new IOException(e.toString()); should use
StringUtils.stringifyException(e), otherwise the stack information will be lost.
-# scheduleBlockReport() should replace lines 690 - 691.
- FSDataset.java
-# private getMetaDataInStream(Block b) should be removed.
Everything else looks good.
> Add support for simulated Data Nodes - helpful for testing and performance
> benchmarking of the Name Node without having a large cluster
> ----------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-1989
> URL: https://issues.apache.org/jira/browse/HADOOP-1989
> Project: Hadoop
> Issue Type: Improvement
> Components: dfs
> Reporter: Sanjay Radia
> Priority: Minor
> Attachments: SimulatedStoragePatchSubmit.txt,
> SimulatedStoragePatchSubmit5.txt, SimulatedStoragePatchSubmit6.txt
>
>
> Proposal is to add an implementation for a Simulated Data Node.
> This will
> - allow one to test certain parts of the system (especially the Name Node,
> protocols) much more easily and efficiently.
> - allow one to run performance benchmarks on the Name node without having a
> large cluster.
> - Inject faults for testing (e.g. one can add random faults based
> probability parameters).
> The idea is that the Simulated Data Node will
> - discard any data written to blocks (but remember the blocks and their
> sizes)
> - generate fixed data on the fly when blocks are read (e.g. block is fixed
> set of bytes or repeated sequence of strings).
> The Simulated Data Node can also be used for fault injection.
> The data node can be parameterized with probabilities that allow one to
> control:
> - Delays on reads and writes, creates, etc
> - IO Exceptions
> - Loss of blocks
> - Failures
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