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https://issues.apache.org/jira/browse/HADOOP-15796?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16635197#comment-16635197
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Steve Loughran commented on HADOOP-15796:
-----------------------------------------
I don't know about the other tests, thats unrelated. Only: those mock tests
absolutely need caching: if you can patch that to force-enable it they will
work.
bq. an fs instance is closed from a test teardown while another test is still
using it.
only one test will be running in a JVM at any one time; with parallel test runs
>1 JVM is started up. if you are getting closed() errors then something is
closing a cached FS instance where it shouldn't be
> ClassCastException: S3AFileSystem cannot be cast to MockS3AFileSystem when fs
> caching is disabled
> -------------------------------------------------------------------------------------------------
>
> Key: HADOOP-15796
> URL: https://issues.apache.org/jira/browse/HADOOP-15796
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.1.1
> Reporter: Gabor Bota
> Priority: Major
>
> Sometimes we get {{java.io.IOException: s3a://TEST-BUCKET: FileSystem is
> closed!}} when running tests, because of filesystem caching: an fs instance
> is closed from a test teardown while another test is still using it. (That
> should be fixed in another issue.)
> To avoid test errors introduced by closed fs I've disabled fs caching while
> testing. This caused the following issue in lots of test:
> {noformat}
> [ERROR]
> testPartitionsResolution(org.apache.hadoop.fs.s3a.commit.staging.TestStagingPartitionedFileListing)
> Time elapsed: 1.994 s <<< ERROR!
> java.lang.ClassCastException: org.apache.hadoop.fs.s3a.S3AFileSystem cannot
> be cast to org.apache.hadoop.fs.s3a.MockS3AFileSystem
> at
> org.apache.hadoop.fs.s3a.commit.staging.StagingTestBase.lookupWrapperFS(StagingTestBase.java:145)
> at
> org.apache.hadoop.fs.s3a.commit.staging.StagingTestBase$JobCommitterTest.setupJob(StagingTestBase.java:294)
> {noformat}
> We should fix the casting during these tests.
> To switch of fs caching during a test (mvn verify) run, add the following to
> the config:
> {code:java}
> <property>
> <name>fs.s3a.impl.disable.cache</name>
> <value>true</value>
> </property>
> {code}
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