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https://issues.apache.org/jira/browse/HADOOP-15819?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16644730#comment-16644730
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Gabor Bota commented on HADOOP-15819:
-------------------------------------
I think we should focus on solving this case first, so it would be better not
to talk about parallel test cases.
The FS cache itself could be broken when running parallel tests, but I think it
was never prepared to for parallel test run, and that change should be
addressed in another issue since it's an entirely different topic. If we don't
run parallel tests we still have this problem.
The issue I see right now is that we close the filesystem after each test and I
was not able to find another class that does this. I think it's very specific
to AbstractS3ATestBase (so S3A) and it's 33 implementations.
{{org.apache.hadoop.fs.s3a.AbstractS3ATestBase#teardown}} is called after each
test, because the superclass annotation is {{@After}} on the teardown.
With the current FS cache implementation, another test can get the same FS
instance that the previous test closed. It can even happen if the tests running
are from the *same class*.
> S3A integration test failures: FileSystem is closed! - without parallel test
> run
> --------------------------------------------------------------------------------
>
> Key: HADOOP-15819
> URL: https://issues.apache.org/jira/browse/HADOOP-15819
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/s3
> Affects Versions: 3.1.1
> Reporter: Gabor Bota
> Assignee: Gabor Bota
> Priority: Critical
> Attachments: S3ACloseEnforcedFileSystem.java,
> closed_fs_closers_example_5klines.log.zip
>
>
> Running the integration tests for hadoop-aws {{mvn -Dscale verify}} against
> Amazon AWS S3 (eu-west-1, us-west-1, with no s3guard) we see a lot of these
> failures:
> {noformat}
> [ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 4.408
> s <<< FAILURE! - in
> org.apache.hadoop.fs.s3a.commit.staging.integration.ITDirectoryCommitMRJob
> [ERROR]
> testMRJob(org.apache.hadoop.fs.s3a.commit.staging.integration.ITDirectoryCommitMRJob)
> Time elapsed: 0.027 s <<< ERROR!
> java.io.IOException: s3a://cloudera-dev-gabor-ireland: FileSystem is closed!
> [ERROR] Tests run: 2, Failures: 0, Errors: 2, Skipped: 0, Time elapsed: 4.345
> s <<< FAILURE! - in
> org.apache.hadoop.fs.s3a.commit.staging.integration.ITStagingCommitMRJob
> [ERROR]
> testStagingDirectory(org.apache.hadoop.fs.s3a.commit.staging.integration.ITStagingCommitMRJob)
> Time elapsed: 0.021 s <<< ERROR!
> java.io.IOException: s3a://cloudera-dev-gabor-ireland: FileSystem is closed!
> [ERROR]
> testMRJob(org.apache.hadoop.fs.s3a.commit.staging.integration.ITStagingCommitMRJob)
> Time elapsed: 0.022 s <<< ERROR!
> java.io.IOException: s3a://cloudera-dev-gabor-ireland: FileSystem is closed!
> [ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 4.489
> s <<< FAILURE! - in
> org.apache.hadoop.fs.s3a.commit.staging.integration.ITStagingCommitMRJobBadDest
> [ERROR]
> testMRJob(org.apache.hadoop.fs.s3a.commit.staging.integration.ITStagingCommitMRJobBadDest)
> Time elapsed: 0.023 s <<< ERROR!
> java.io.IOException: s3a://cloudera-dev-gabor-ireland: FileSystem is closed!
> [ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 4.695
> s <<< FAILURE! - in org.apache.hadoop.fs.s3a.commit.magic.ITMagicCommitMRJob
> [ERROR] testMRJob(org.apache.hadoop.fs.s3a.commit.magic.ITMagicCommitMRJob)
> Time elapsed: 0.039 s <<< ERROR!
> java.io.IOException: s3a://cloudera-dev-gabor-ireland: FileSystem is closed!
> [ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.015
> s <<< FAILURE! - in org.apache.hadoop.fs.s3a.commit.ITestS3ACommitterFactory
> [ERROR]
> testEverything(org.apache.hadoop.fs.s3a.commit.ITestS3ACommitterFactory)
> Time elapsed: 0.014 s <<< ERROR!
> java.io.IOException: s3a://cloudera-dev-gabor-ireland: FileSystem is closed!
> {noformat}
> The big issue is that the tests are running in a serial manner - no test is
> running on top of the other - so we should not see that the tests are failing
> like this. The issue could be in how we handle
> org.apache.hadoop.fs.FileSystem#CACHE - the tests should use the same
> S3AFileSystem so if A test uses a FileSystem and closes it in teardown then B
> test will get the same FileSystem object from the cache and try to use it,
> but it is closed.
> We see this a lot in our downstream testing too. It's not possible to tell
> that the failed regression test result is an implementation issue in the
> runtime code or a test implementation problem.
> I've checked when and what closes the S3AFileSystem with a sightly modified
> version of S3AFileSystem which logs the closers of the fs if an error should
> occur. I'll attach this modified java file for reference. See the next
> example of the result when it's running:
> {noformat}
> 2018-10-04 00:52:25,596 [Thread-4201] ERROR s3a.S3ACloseEnforcedFileSystem
> (S3ACloseEnforcedFileSystem.java:checkIfClosed(74)) - Use after close():
> java.lang.RuntimeException: Using closed FS!.
> at
> org.apache.hadoop.fs.s3a.S3ACloseEnforcedFileSystem.checkIfClosed(S3ACloseEnforcedFileSystem.java:73)
> at
> org.apache.hadoop.fs.s3a.S3ACloseEnforcedFileSystem.mkdirs(S3ACloseEnforcedFileSystem.java:474)
> at
> org.apache.hadoop.fs.contract.AbstractFSContractTestBase.mkdirs(AbstractFSContractTestBase.java:338)
> at
> org.apache.hadoop.fs.contract.AbstractFSContractTestBase.setup(AbstractFSContractTestBase.java:193)
> at
> org.apache.hadoop.fs.s3a.ITestS3AClosedFS.setup(ITestS3AClosedFS.java:40)
> at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
> at
> org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
> at
> org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
> at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
> at
> org.junit.internal.runners.statements.FailOnTimeout$StatementThread.run(FailOnTimeout.java:74)
> 2018-10-04 00:52:25,596 [Thread-4201] WARN s3a.S3ACloseEnforcedFileSystem
> (S3ACloseEnforcedFileSystem.java:logClosers(61)) - FS was closed 6 times by:
> 2018-10-04 00:52:25,596 [Thread-4201] WARN s3a.S3ACloseEnforcedFileSystem
> (S3ACloseEnforcedFileSystem.java:logClosers(64)) - ----------------- close()
> #1 ---------------
> 2018-10-04 00:52:25,596 [Thread-4201] WARN s3a.S3ACloseEnforcedFileSystem
> (S3ACloseEnforcedFileSystem.java:logClosers(65)) -
> java.lang.RuntimeException: close() called here
> at
> org.apache.hadoop.fs.s3a.S3ACloseEnforcedFileSystem.close(S3ACloseEnforcedFileSystem.java:83)
> at org.apache.hadoop.io.IOUtils.cleanupWithLogger(IOUtils.java:280)
> at org.apache.hadoop.io.IOUtils.closeStream(IOUtils.java:298)
> at
> org.apache.hadoop.fs.s3a.AbstractS3ATestBase.teardown(AbstractS3ATestBase.java:55)
> at
> org.apache.hadoop.fs.s3a.commit.AbstractCommitITest.teardown(AbstractCommitITest.java:206)
> at
> org.apache.hadoop.fs.s3a.auth.ITestAssumedRoleCommitOperations.teardown(ITestAssumedRoleCommitOperations.java:90)
> at sun.reflect.GeneratedMethodAccessor23.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
> at
> org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:33)
> at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
> at
> org.junit.internal.runners.statements.FailOnTimeout$StatementThread.run(FailOnTimeout.java:74)
> 2018-10-04 00:52:25,596 [Thread-4201] WARN s3a.S3ACloseEnforcedFileSystem
> (S3ACloseEnforcedFileSystem.java:logClosers(64)) - ----------------- close()
> #2 ---------------
> 2018-10-04 00:52:25,596 [Thread-4201] WARN s3a.S3ACloseEnforcedFileSystem
> (S3ACloseEnforcedFileSystem.java:logClosers(65)) -
> java.lang.RuntimeException: close() called here
> at
> org.apache.hadoop.fs.s3a.S3ACloseEnforcedFileSystem.close(S3ACloseEnforcedFileSystem.java:83)
> at org.apache.hadoop.io.IOUtils.cleanupWithLogger(IOUtils.java:280)
> at org.apache.hadoop.io.IOUtils.closeStream(IOUtils.java:298)
> at
> org.apache.hadoop.fs.s3a.AbstractS3ATestBase.teardown(AbstractS3ATestBase.java:55)
> at sun.reflect.GeneratedMethodAccessor23.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
> at
> org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:33)
> at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
> at
> org.junit.internal.runners.statements.FailOnTimeout$StatementThread.run(FailOnTimeout.java:74)
> 2018-10-04 00:52:25,597 [Thread-4201] WARN s3a.S3ACloseEnforcedFileSystem
> (S3ACloseEnforcedFileSystem.java:logClosers(64)) - ----------------- close()
> #3 ---------------
> 2018-10-04 00:52:25,598 [Thread-4201] WARN s3a.S3ACloseEnforcedFileSystem
> (S3ACloseEnforcedFileSystem.java:logClosers(65)) -
> java.lang.RuntimeException: close() called here
> at
> org.apache.hadoop.fs.s3a.S3ACloseEnforcedFileSystem.close(S3ACloseEnforcedFileSystem.java:83)
> at org.apache.hadoop.io.IOUtils.cleanupWithLogger(IOUtils.java:280)
> at org.apache.hadoop.io.IOUtils.closeStream(IOUtils.java:298)
> at
> org.apache.hadoop.fs.s3a.AbstractS3ATestBase.teardown(AbstractS3ATestBase.java:55)
> at sun.reflect.GeneratedMethodAccessor23.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
> at
> org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:33)
> at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
> at
> org.junit.internal.runners.statements.FailOnTimeout$StatementThread.run(FailOnTimeout.java:74)
> (...)
> {noformat}
> From the logs it seems that the closers are the teardown methods of the
> abstract test classes, so the same FileSystem object gets reused between
> tests.
> To run a test with the modified fs the following should be in the config:
> {noformat}
> <property>
> <name>fs.s3a.impl</name>
> <value>org.apache.hadoop.fs.s3a.S3ACloseEnforcedFileSystem</value>
> <description>The implementation class of the S3A Filesystem</description>
> </property>
> {noformat}
> I file this jira to solve this issue, and start a conversation if needed.
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