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https://issues.apache.org/jira/browse/YARN-7244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16203720#comment-16203720
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Jason Lowe commented on YARN-7244:
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Thanks for updating the patch! The test failure appears to be related, and it
would be good to cleanup the checkstyle issues.
In TestShuffleHandler the code to build absLogDir is replicated a lot of times
and is always the same value. This should be a final static computed once in
TestShuffleHandler and referenced in the places that need it rather than
copy-n-paste of the code. This also removes the need for the getAbsLogDir
method. When computing absLogDir the code should not assume the target
directory is the right place but rather look at the environment for direction
where to go. GenericTestUtils#getTestDir would help here.
Rather than needing a TestShuffleHandler1 class that overrides
getAuxilaryLocalPathHandler, I think we can just use ShuffleHandler directly
and call setAuxiliaryLocalPathHandler after creating it. That's what the
nodemanager is going to do anyway during normal execution, and the unit test
would be closer to the real-world scenario.
Do we really need to provide both a TestAuxiliaryLocalPathHandler and
TestAuxiliaryLocalPathHandler1? The original test code used a
LocalDirAllocator directly, and it seems like we could use one test handler
class that passes through to the same local dir allocator that was originally
setup in the unit test.
AuxiliaryService#getAuxiliaryLocalPathHandler and
AuxiliaryService#setAuxiliaryLocalPathHandler need javadocs since this is a
public class that we expect app framework providers to use.
AuxServices should take the path handler in its constructor since it's not
legal to call any other methods before it has been set. This allows the
handler field to be marked final and removes the need for get/set methods.
In BaseContainerManagerTest it's more appropriate to start the node health
checker service rather than the dirs handler, since the health checker is
responsible for initing and starting the dirs handler. Otherwise it looks
weird that we started a service without calling init first.
TestAuxServices should use Mockito to build the AuxiliaryLocalPathHandler mock
object.
AuxService#getServices returns a collection of AuxiliaryService objects, so it
would be cleaner to iterate on AuxiliaryService objects directly rather than
iterate on Service objects and cast them in the loop.
I'm not a fan of testContainerAuxPathHandler since it uses long sleeps to
essentially test that the aux path handler is hooked up to the nodemanager's
dir handler. It would be much better if we could eliminate the need for sleeps
and instead set a mocked/controllable dirs handler in the containermanager then
change the behavior of the mocked object and verify that change is reflected in
the aux path handler is well. Or even simpler, AuxiliaryLocalPathHandlerImpl
could take a dir handler as a constructor argument and change to a static class
so we can instantiate it and test it directly rather than needing to bring up
the entire container manager for this test.
> ShuffleHandler is not aware of disks that are added
> ---------------------------------------------------
>
> Key: YARN-7244
> URL: https://issues.apache.org/jira/browse/YARN-7244
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Kuhu Shukla
> Assignee: Kuhu Shukla
> Attachments: YARN-7244.001.patch, YARN-7244.002.patch,
> YARN-7244.003.patch, YARN-7244.004.patch, YARN-7244.005.patch
>
>
> The ShuffleHandler permanently remembers the list of "good" disks on NM
> startup. If disks later are added to the node then map tasks will start using
> them but the ShuffleHandler will not be aware of them. The end result is that
> the data cannot be shuffled from the node leading to fetch failures and
> re-runs of the map tasks.
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