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https://issues.apache.org/jira/browse/TEZ-4475?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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László Bodor updated TEZ-4475:
------------------------------
Summary: VertexStatus is missing in TestLocalMode if DAG finishes too
quickly (was: VertexStatus is missing in TestLocalMode if DAG finished too
quickly)
> VertexStatus is missing in TestLocalMode if DAG finishes too quickly
> --------------------------------------------------------------------
>
> Key: TEZ-4475
> URL: https://issues.apache.org/jira/browse/TEZ-4475
> Project: Apache Tez
> Issue Type: Bug
> Reporter: László Bodor
> Assignee: László Bodor
> Priority: Major
>
> It's very hard to reproduce, but I was able to do it like:
> {code}
> 2023-02-13 11:32:16,302 INFO [DAGAppMaster Thread] app.DAGAppMaster
> (DAGAppMaster.java:startDAG(2545)) - Running DAG:
> testMultipleClientsWithoutSession2_useDfs
> ...
> 2023-02-13 11:32:16,406 INFO [Thread-675] client.DAGClientImpl
> (DAGClientImpl.java:getVertexStatusInternal(280)) - getVertexStatusInternal
> for Sleep, dagCompleted: true, in cache: false
> {code}
> in this case, the latter log message was added
> [here|https://github.com/apache/tez/blob/e3e91a150dad44a9daa3102da04542e2e365203d/tez-api/src/main/java/org/apache/tez/dag/api/client/DAGClientImpl.java#L305]
> as:
> {code}
> LOG.info("getVertexStatusInternal for {}, dagCompleted: {}, in cache:
> {}", vertexName, dagCompleted,
> cachedVertexStatus.containsKey(vertexName));
> {code}
> so, the dag has already completed, but there were no vertex status updates
> yet (cache was empty), so unit tests failed with an inconvenient NPE
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