[jira] [Created] (FLINK-8070) YarnTestBase should print prohibited string

["Chesnay Schepler (JIRA)" <ji...@apache.org>]

Chesnay Schepler created FLINK-8070:
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             Summary: YarnTestBase should print prohibited string
                 Key: FLINK-8070
                 URL: https://issues.apache.org/jira/browse/FLINK-8070
             Project: Flink
          Issue Type: Improvement
          Components: Tests, YARN
    Affects Versions: 1.4.0
            Reporter: Chesnay Schepler
            Assignee: Chesnay Schepler
            Priority: Critical
             Fix For: 1.4.0


The yarn tests check the log files for a set of prohibited strings. If found, the entire log file is logged as WARN, the offending line is logged as ERROR, and the test fails with this unhelpful message:
{code}
java.lang.AssertionError(Found a file /home/travis/build/apache/flink/flink-yarn-tests/target/flink-yarn-tests-fifo/flink-yarn-tests-fifo-logDir-nm-1_0/application_1510164935122_0002/container_1510164935122_0002_01_000001/jobmanager.log with a prohibited string: [Exception, Started SelectChannelConnector@0.0.0.0:8081])
{code}

If you don't have log access on travis you have thus no knowledge what actually went wrong.

I propose to also print smaller excerpts around the found error (like 10 lines or smth) in the Assert.fail message.



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