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TEZ-4474: Added config to fail the DAG status when recovery data is missing - #266
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shameersss1
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Feb 17, 2023
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The changes LGTM +1. I have some one minor nit comment and please check the checkstyle violation : https://ci-hadoop.apache.org/job/tez-multibranch/job/PR-266/10/artifact/out/diff-checkstyle-tez-dag.txt
| */ | ||
| @ConfigurationScope(Scope.AM) | ||
| @ConfigurationProperty(type="boolean") | ||
| public static final String TEZ_AM_FAILURE_ON_MISSING_RECOVERY = |
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nit: can we have a better config name? TEZ_AM_FAILURE_ON_MISSING_RECOVERY_DATA
shameersss1
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Feb 17, 2023
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@abstractdog Could you please review the PR? |
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shameersss1
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Feb 17, 2023
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Can we change the PR title to adhere with the latest approach
abstractdog
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Feb 19, 2023
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@mudit-97, @shameersss1: thanks for working on this so far, let me find some time next week to discover and review this scenario and patch |
abstractdog
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Feb 22, 2023
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| field.set(dam, spyRecoveryFs); | ||
| verify(dam.mockScheduler).setShouldUnregisterFlag(); | ||
| verify(dam.mockShutdown).shutdown(); |
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we're testing the new feature here, I'm missing something here:
- it's not clear for the first sight which part of the spy fs caused this expected behavior? (returning with ERROR)
- is there a chance to extend this method to reflect what happens in case of TEZ_AM_FAILURE_ON_MISSING_RECOVERY_DATA=false?
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@abstractdog , enhanced the test case
- For the spy, now I am checking the exact number of invocations + I am capturing the values in each invocation to confirm this happened during recovery flow only and that too during summary file fetch
- I created a separate test case to capture that scenario also when TEZ_AM_FAILURE_ON_MISSING_RECOVERY_DATA is false
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thanks @mudit-97 , just a few questions:
- I'm not 100% sure, but do we really need spy here? as far as I know we use spies when really need an instance created by us instead of a mocked one, would you consider trying to use a mock here, which might be much simpler?
- if we end up using a spy here, please fix the method arguments' name...I know, this might look nitpicking, but even if we don't use them now, it's always a code smell to have args like "boolean b, int i, short i1, long l"
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@abstractdog , converted it to mock and removed spy, please check
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very cool, thanks, one more comment :)
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@abstractdog done that change also, please check
| } | ||
| @Override | ||
| public FSDataOutputStream create(Path path, FsPermission fsPermission, boolean b, |
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this looks like an IDE generated method, please use the correct variable names (even if they are not used), e.g. here:
public FSDataOutputStream create(Path f, FsPermission permission, boolean overwrite, int bufferSize,
short replication, long blockSize, Progressable progress) throws IOException {
please check other methods too
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@abstractdog , I tried to create a spy filesystem object, FileSystem was an abstract hadoop class and it had the similar variable names so I kept them same, these I just created for placeholder because I needed to create an instance of Filesystem and kept in parity with main class, if needed I will replace these with some other names
| ApplicationId appId = ApplicationId.newInstance(1, 1); | ||
| ApplicationAttemptId attemptId = ApplicationAttemptId.newInstance(appId, 2); | ||
| FileSystem spyRecoveryFs = spy(new FileSystem() { |
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is this spy reusable in other testing methods in this class? if so, refactor it to class field, if it's not, make it obvious why is this special (with variable name and/or comment on implemented methods)
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made it common for the class
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tez-yetus
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Feb 23, 2023
🎊 +1 overall
This message was automatically generated. |
| private static final String CLASS_SUFFIX = "_CLASS"; | ||
| private static final File TEST_DIR = new File(System.getProperty("test.build.data"), | ||
| TestDAGAppMaster.class.getName()).getAbsoluteFile(); | ||
| private final FileSystem mockFs = mock(FileSystem.class); |
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as this is just a single line now, it doesn't have to be a field, you can have it in the methods
abstractdog
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February 24, 2023 09:15
tez-yetus
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Feb 24, 2023
🎊 +1 overall
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tez-yetus
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Feb 24, 2023
🎊 +1 overall
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mudit-97
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Feb 24, 2023
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@abstractdog , the tests are completed, can you please approve and merge |
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When Tez DAG recovery is failed because of some reason in the second retry of any Tez AM, then in corner case scenario, Tez Job sets DAG state to IDLE
Once the DAG state is set to IDLE, then after checkAndHandleSessionTimeout(), Tez AM will try to shutdown the DAG, and since recovery was failed so there will not be any running DAGs
If there are no RUNNING DAGs and state of DAG is IDLE, then by default AM sets the status to SUCCEEDED
This can result in issues in dependent systems like Hive which will move ahead with other tasks in pipeline assuming the DAG was success, this can result in moving empty data in Hive
As part of this PR, we are proposing to introduce a patch in TEZ, which introduces a config, which when set, then in case of recovery missing in attempts > 1, it fails the DAG
Raised JIRA for the same: https://issues.apache.org/jira/browse/TEZ-4474