[
https://issues.apache.org/jira/browse/HADOOP-1989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12542823
]
Sanjay Radia commented on HADOOP-1989:
--------------------------------------
I am seeing no merge conflicts with DataChecksum.java. (Just did an update from
SVN).
(Also ran the above test with no problems.)
Email me your merged Datachecksum.java file, will compare with my merged file.
sanjay
> 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
> Affects Versions: 0.16.0
> Reporter: Sanjay Radia
> Assignee: Sanjay Radia
> Priority: Minor
> Fix For: 0.16.0
>
> Attachments: SimulatedStoragePatchSubmit.txt,
> SimulatedStoragePatchSubmit5.txt, SimulatedStoragePatchSubmit6.txt,
> SimulatedStoragePatchSubmit7.txt, SimulatedStoragePatchSubmit8.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
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
