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https://issues.apache.org/jira/browse/HADOOP-1989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12542648
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dhruba borthakur commented on HADOOP-1989:
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I still get a merge failure on DataChecksum.java. I managed to merge it by
hand. I am running the unit test and saw a test failure on TestCrcCorruption:
Testcase: testCrcCorruption took 12.692 sec
Caused an ERROR
Java heap space
java.lang.OutOfMemoryError: Java heap space
at org.apache.hadoop.fs.FSInputChecker.set(FSInputChecker.java:396)
at org.apache.hadoop.fs.FSInputChecker.<init>(FSInputChecker.java:71)
at org.apache.hadoop.dfs.DFSClient$BlockReader.<init>(DFSClient.java:697)
at
org.apache.hadoop.dfs.DFSClient$BlockReader.newBlockReader(DFSClient.java:755)
at
org.apache.hadoop.dfs.DFSClient$DFSInputStream.fetchBlockByteRange(DFSClient.java:1144)
at org.apache.hadoop.dfs.DFSClient$DFSInputStream.read(DFSClient.java:1211)
at org.apache.hadoop.fs.FSInputStream.readFully(FSInputStream.java:66)
at
org.apache.hadoop.fs.FSDataInputStream.readFully(FSDataInputStream.java:56)
at org.apache.hadoop.dfs.DFSTestUtil.checkFiles(DFSTestUtil.java:150)
at
org.apache.hadoop.dfs.TestCrcCorruption.thistest(TestCrcCorruption.java:181)
at
org.apache.hadoop.dfs.TestCrcCorruption.testCrcCorruption(TestCrcCorruption.java:223)
> 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
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