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https://issues.apache.org/jira/browse/MAPREDUCE-4202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13263687#comment-13263687
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Robert Joseph Evans commented on MAPREDUCE-4202:
------------------------------------------------
I was debugging this too and the reason that the test passed previously was
because it was trying to instantiate a DefaultFileSystem, which with not config
was file:// which there was no fs.file.impl.class for.
{noformat}
java.io.IOException: No FileSystem for scheme: file
at
org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2085)
at org.apache.hadoop.fs.FileSystem.access$0(FileSystem.java:2081)
at
org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2122)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2104)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:284)
at org.apache.hadoop.fs.FileSystem.getLocal(FileSystem.java:255)
at
org.apache.hadoop.mapred.LocalJobRunner.<init>(LocalJobRunner.java:605)
at
org.apache.hadoop.mapred.LocalJobRunner.<init>(LocalJobRunner.java:600)
at
org.apache.hadoop.mapred.LocalClientProtocolProvider.create(LocalClientProtocolProvider.java:43)
at org.apache.hadoop.mapreduce.Cluster.initialize(Cluster.java:98)
at org.apache.hadoop.mapreduce.Cluster.<init>(Cluster.java:85)
at org.apache.hadoop.mapreduce.Cluster.<init>(Cluster.java:78)
at
org.apache.hadoop.mapreduce.TestYarnClientProtocolProvider.testClusterWithYarnClientProtocolProvider(TestYarnClientProtocolProvider.java:56)
{noformat}
Also org.apache.hadoop.conf.TestNoDefaultsJobConf is more or less trying to
test the exact opposite of TestYarnClientProtocolProvider. For backwards
compatibility I would prefer to see TestYarnClientProtocolProvider not explode
if no configs are set, but just validate that it got a LocalClientProvider.
> TestYarnClientProtocolProvider is broken
> ----------------------------------------
>
> Key: MAPREDUCE-4202
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4202
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: test
> Affects Versions: 0.24.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: MAPREDUCE-4202.patch
>
>
> The test fails because a cluster is unexpectedly created with an empty conf.
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