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https://issues.apache.org/jira/browse/HDFS-2209?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran updated HDFS-2209:
---------------------------------
Fix Version/s: 0.24.0
Status: Patch Available (was: In Progress)
For review, but not yet for commitment
> MiniDFS cluster improvements
> ----------------------------
>
> Key: HDFS-2209
> URL: https://issues.apache.org/jira/browse/HDFS-2209
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: test
> Affects Versions: 0.20.203.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
> Fix For: 0.24.0
>
> Attachments: HDFS-2209.patch
>
> Original Estimate: 1h
> Time Spent: 0.5h
> Remaining Estimate: 3h
>
> I've been deploying MiniDFSCluster for some testing, and while using
> it/looking through the code I made some notes of where there are issues and
> improvement opportunities. This is mostly minor as its a test tool, but a
> risk of synchronization problems is there and does need addressing; the rest
> are all feature creep.
> Field {{nameNode}} should be marked as volatile as the shutdown operation can
> be in a different thread than startup. Best of all,
> add synchronized methods to set and get the field, as well as shutdown.
> The data dir is set from from System Properties.
> {code}
> base_dir = new File(System.getProperty("test.build.data",
> "build/test/data"), "dfs/");
> data_dir = new File(base_dir, "data");
> {code}
> This is done in {{formatDataNodeDirs()}} {{corruptBlockOnDataNode()}} and
> the constructor.
> Improvement: have a test property in the conf file, and only read the system
> property if this is unset. This will enable
> multiple MiniDFSClusters to come up in the same JVM, and handle
> shutdown/startup race conditions better, and avoid the
> "java.io.IOException: Cannot lock storage build/test/data/dfs/name1. The
> directory is already locked." messages
> Messages should log to the commons logging and not {{System.err}} and
> {{System.out}}. This enables containers to catch and stream better,
> and include more diagnostics such as timestamp and thread Id
> Class could benefit from a method to return the FS URI, rather than just the
> FS. This currently has to be worked around with some tricks involving a
> cached configuration
> {{waitActive()}} could get confused if "localhost" maps to an IPv6 address.
> Better to ask for 127.0.0.1 as the hostname; Junit
> test runs may need to be set up to force in IPv4 too.
> {{injectBlocks}} has a spelling error in the IOException,
> "SumulatedFSDataset" is the correct spelling
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